What is the maximum length of a URL in different browsers

Question

What is the maximum length of a URL in different browsers  Does it differ among browsers  Is a maximum URL length part of the HTTP specification

User · Answer

ASP NET 2 and SQL Server reporting services 2005 have a limit of 2028  I found this out the hard way  where my dynamic URL generator would not pass over some parameters to a report beyond that point  This was under Internet nbsp Explorer nbsp 8

User · Answer

WWW FAQs  What is the maximum length of a URL  has its own answer based on empirical testing and research  The short answer is that going over 2048 characters makes Internet nbsp Explorer unhappy and thus this is the limit you should use  See the page for a long answer

User · Answer

I wrote this test that keeps on adding  a  to parameter until the browser fails  C  part    AcceptVerbs HttpVerbs Get   public ActionResult ParamTest string x        ViewBag TestLength   0      if   string IsNullOrEmpty x                 System IO File WriteAllLines  c  result txt                          new    Request UserAgent  x Length ToString              ViewBag TestLength   x Length   1             return View        View    lt script src    ajax googleapis com ajax libs jquery 1 9 1 jquery min js  gt  lt  script gt    lt script type  text javascript  gt        function             var text    a           for  var i   0  i  lt  parseInt  ViewBag TestLength -1  i                  text     a                      document location href    http   localhost 50766 Home ParamTest x     text           lt  script gt    PART 1  On Chrome I got   Mozilla 5 0  Windows NT 6 1  WOW64  AppleWebKit 537 36  KHTML  like Gecko  Chrome 43 0 2357 130 Safari 537 36 2046   It then blew up with      HTTP Error 404 15 - Not Found The request filtering module is   configured to deny a request where the query string is too long    Same on Internet nbsp Explorer nbsp 8 and Firefox  Mozilla 4 0  compatible  MSIE 8 0  Windows NT 6 1  WOW64  Trident 4 0  SLCC2   NET CLR 2 0 50727   NET CLR 3 5 30729   NET CLR 3 0 30729   NET4 0C   NET4 0E  2046  Mozilla 5 0  Windows NT 6 1  WOW64  rv 38 0  Gecko 20100101 Firefox 38 0 2046   PART 2  I went easy mode and added additional limits to IISExpress applicationhost config and web config setting maxQueryStringLength  32768    Chrome failed with message  Bad Request - Request Too Long  HTTP Error 400  The size of the request headers is too long    after 7744 characters   Mozilla 5 0  Windows NT 6 1  WOW64  AppleWebKit 537 36  KHTML  like Gecko  Chrome 43 0 2357 130 Safari 537 36 7744   PART 3  Added   lt headerLimits gt       lt add header  Content-type  sizeLimit  32768    gt   lt  headerLimits gt    which didn t help at all  I finally decided to use fiddler to remove the referrer from header   static function OnBeforeRequest oSession  Session        if  oSession url Contains  localhost 50766              oSession RequestHeaders Remove  Referer            Which did nicely   Chrome  got to 15613 characters   I guess it s a 16K limit for IIS   And it failed again with    lt BODY gt  lt h2 gt Bad Request - Request Too Long lt  h2 gt   lt hr gt  lt p gt HTTP Error 400  The size of the request headers is too long  lt  p gt    Mozilla 5 0  Windows NT 6 1  WOW64  AppleWebKit 537 36  KHTML  like Gecko  Chrome 43 0 2357 130 Safari 537 36 15613   Firefox   Mozilla 5 0  Windows NT 6 1  WOW64  rv 38 0  Gecko 20100101 Firefox 38 0 15708   Internet Explorer 8 failed with iexplore exe crashing     After 2505  Mozilla 4 0  compatible  MSIE 8 0  Windows NT 6 1  WOW64  Trident 4 0  SLCC2   NET CLR 2 0 50727   NET CLR 3 5 30729   NET CLR 3 0 30729   NET4 0C   NET4 0E  2505   Android Emulator  Mozilla 5 0  Linux  Android 5 1  Android SDK built for x86 Build LKY45  AppleWebKit 537 36  KHTML  like Gecko  Version 4 0 Chrome 39 0 0 0 Mobile Safari 537 36 7377   Internet Explorer 11  Mozilla 4 0  compatible  MSIE 7 0  Windows NT 6 1  Trident 7 0  SLCC2   NET CLR 2 0 50727   NET CLR 3 5 30729   NET CLR 3 0 30729  Media Center PC 6 0   NET4 0C  4043   Internet Explorer 10  Mozilla 4 0  compatible  MSIE 7 0  Windows NT 6 1  Trident 6 0  SLCC2   NET CLR 2 0 50727   NET CLR 3 5 30729   NET CLR 3 0 30729  Media Center PC 6 0   NET4 0C  4043   Internet Explorer 9  Mozilla 5 0  compatible  MSIE 9 0  Windows NT 6 1  Trident 5 0  4043

User · Answer

Microsoft Support says  Maximum URL length is 2 083 characters in Internet Explorer    IE has problems with URLs longer than that  Firefox seems to work fine with  4k chars

User · Answer

The longest URLs I came across are data URLs  Example image URL from Google image results  11747 characters   data image jpeg base64  9j 4AAQSkZJRgABAQAAAQABAAD 2wCEAAkGBhQSERIUExQUFRUUFxcXFhQYFBQXGBgYFhkVGBkVFxUXHCYfGBojGRQVHy8gJCcpLCwsFh4xNTAqNSYrLCkBCQoKDgwOGg8PGiokHyQpLDUqKSwsLCksKSwpKSwsLCwpKSkpLCwpLCksKSwpLCkpLCwsLCkpKSwsLCwsLDQsLP AABEIAM0A9gMBIgACEQEDEQH xAAcAAACAgMBAQAAAAAAAAAAAAAABQQGAgMHAQj xABTEAACAAQCBAcLBgsFBwUAAAABAgADBBESIQUGMUEHEyJRYYGRFBYyVHF0lKGxs9IjNEKS0dMXMzVSYmRypMHj8GOTo7LiJENzosLh8RVTgoPD 8QAGQEBAAMBAQAAAAAAAAAAAAAAAAECAwQF 8QAJxEAAgIBAwMEAgMAAAAAAAAAAAECEQMSITEEE0EiUWGBkfAyceH 2gAMAwEAAhEDEQA AOiaq6q0b0NGzUlMzNTySWMiUSSZaEkkrmbw17z6LxOl9HlfDBqf8wovNpHu0hvACjvPovE6X0eV8MHefReJ0vo8r4YbwQAo7z6LxOl9HlfDB3n0XidL6PK GG8EAKO8 i8TpfR5Xwwd59F4nS jyvhhsTaKnX69gzGlUiCc6 FMZsMpTuBYAlj0LnFoxcuCG0ht3n0XidL6PK GDvPovE6X0eV8MIX0jpQ8pe5SPzeKndmLFl2QuPCpMpnwV1Pg345ZuLc4DbfbG0enlJelp ZR5EuS3959F4nS jyvhg7z6LxOl9HlfDDCjrFmosxCSrgMLixsdmRzEb45zQUd59F4nS 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Why is the Internet nbsp Explorer limit only 2K while IIS has a limit of 16K  I don t think it makes sense   So I want to start an experiment about Ajax request URL size limits   I have set my Tomcat HTTP connector s maxHttpHeaderSize  1048576   And prepared a very long URL   Then I send a request with the long URL like the following   var url   ajax url-length jsp   jQuery ajax url  data  q  0  repeat 1048000-url length-4        jQuery reports done  Tomcat reports the URL requested is 1048015 bytes  It was tested with Chrome 50 and Internet nbsp Explorer nbsp 11   So web browsers won t truncate or limit your URL intentionally when sending Ajax requests

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On Apple platforms  iOS macOS tvOS watchOS   the limit may be a 2 GB long URL scheme  as seen by this comment in the source code of Swift         Make sure the URL string isn t too long     We re limiting it to 2GB for backwards compatibility with 32-bit executables using NS CFURL if    urlStringLength  gt  0   amp  amp   urlStringLength  lt   INT MAX               On iOS  I ve tested and confirmed that even a 300  MB long URL is accepted  You can try such a long URL like this in Objective-C   NSString  path      a   stringByPaddingToLength 314572800 withString   a  startingAtIndex 0   NSString  js    NSString stringWithFormat   window location href             path    self webView stringByEvaluatingJavaScriptFromString js     And catch if it succeed with   -  BOOL webView  UIWebView   webView shouldStartLoadWithRequest  NSURLRequest   request navigationType  UIWebViewNavigationType navigationType       NSLog   length         request URL absoluteString length        return YES

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Short answer - de facto limit of 2000 characters If you keep URLs under 2000 characters  they ll work in virtually any combination of client and server software  If you are targeting particular browsers  see below for more details on specific limits  Longer answer - first  the standards    RFC 2616  Hypertext Transfer Protocol HTTP 1 1  section 3 2 1 says  The HTTP protocol does not place any a priori limit on the length of a URI  Servers MUST be able to handle the URI of any resource they    serve  and SHOULD be able to handle URIs of unbounded length if they    provide GET-based forms that could generate such URIs  A server    SHOULD return 414  Request-URI Too Long  status if a URI is longer    than the server can handle  see section 10 4 15    That RFC has been obsoleted by RFC7230 which is a refresh of the HTTP 1 1 specification  It contains similar language  but also goes on to suggest this   Various ad hoc limitations on request-line length are found in practice  It is RECOMMENDED that all HTTP senders and recipients support  at a minimum  request-line lengths of 8000 octets      and the reality That s what the standards say  For the reality  there was an article on boutell com  link goes to Internet Archive backup  that discussed what individual browser and server implementations will support  The executive summary is   Extremely long URLs are usually a mistake  URLs over 2 000 characters will not work in the most popular web browsers  Don t use them if you intend your site to work for the majority of Internet users    Note  this is a quote from an article written in 2006  but in 2015 IE s declining usage means that longer URLs do work for the majority  However  IE still has the limitation     Internet Explorer s limitations    IE8 s maximum URL length is 2083 chars  and it seems IE9 has a similar limit  I ve tested IE10 and the address bar will only accept 2083 chars  You can click a URL which is longer than this  but the address bar will still only show 2083 characters of this link  There s a nice writeup on the IE Internals blog which goes into some of the background to this  There are mixed reports IE11 supports longer URLs - see comments below  Given some people report issues  the general advice still stands  Search engines like URLs  lt  2048 chars    Be aware that the sitemaps protocol  which allows a site to inform search engines about available pages  has a limit of 2048 characters in a URL  If you intend to use sitemaps  a limit has been decided for you   see Calin-Andrei Burloiu s answer below  There s also some research from 2010 into the maximum URL length that search engines will crawl and index  They found the limit was 2047 chars  which appears allied to the sitemap protocol spec  However  they also found the Google SERP tool wouldn t cope with URLs longer than 1855 chars  CDNs have limits CDNs also impose limits on URI length  and will return a 414 Too long request when these limits are reached  for example   Fastly 8Kb CloudFront 8Kb CloudFlare 32Kb   credit to timrs2998 for providing that info in the comments  Additional browser roundup I tested the following against an Apache 2 4 server configured with a very large LimitRequestLine and LimitRequestFieldSize  Browser     Address bar   document location                           or anchor tag ------------------------------------------ Chrome          32779            gt 64k Android          8192            gt 64k Firefox           gt 64k            gt 64k Safari            gt 64k            gt 64k IE11             2047           5120 Edge 16          2047          10240  See also this answer from Matas Vaitkevicius below  Is this information up to date  This is a popular question  and as the original research is  14 years old I ll try to keep it up to date  As of Sep 2020  the advice still stands  Even though IE11 may possibly accept longer URLs  the ubiquity of older IE installations plus the search engine limitations mean staying under 2000 chars is the best general policy

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Limit request line directive sets the maximum length of a URL  By default  it is set to 8190  which gives you a lot of room  However other servers and some browses  limit the length more   Because all parameters are passed on the URL line  items that were in password of hidden fields will also be displayed in the URL of course  Neither mobile should be used for real security measures and should be considered cosmetic security at best

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Short answer - de facto limit of 2000 characters If you keep URLs under 2000 characters  they ll work in virtually any combination of client and server software  If you are targeting particular browsers  see below for more details on specific limits  Longer answer - first  the standards    RFC 2616  Hypertext Transfer Protocol HTTP 1 1  section 3 2 1 says  The HTTP protocol does not place any a priori limit on the length of a URI  Servers MUST be able to handle the URI of any resource they    serve  and SHOULD be able to handle URIs of unbounded length if they    provide GET-based forms that could generate such URIs  A server    SHOULD return 414  Request-URI Too Long  status if a URI is longer    than the server can handle  see section 10 4 15    That RFC has been obsoleted by RFC7230 which is a refresh of the HTTP 1 1 specification  It contains similar language  but also goes on to suggest this   Various ad hoc limitations on request-line length are found in practice  It is RECOMMENDED that all HTTP senders and recipients support  at a minimum  request-line lengths of 8000 octets      and the reality That s what the standards say  For the reality  there was an article on boutell com  link goes to Internet Archive backup  that discussed what individual browser and server implementations will support  The executive summary is   Extremely long URLs are usually a mistake  URLs over 2 000 characters will not work in the most popular web browsers  Don t use them if you intend your site to work for the majority of Internet users    Note  this is a quote from an article written in 2006  but in 2015 IE s declining usage means that longer URLs do work for the majority  However  IE still has the limitation     Internet Explorer s limitations    IE8 s maximum URL length is 2083 chars  and it seems IE9 has a similar limit  I ve tested IE10 and the address bar will only accept 2083 chars  You can click a URL which is longer than this  but the address bar will still only show 2083 characters of this link  There s a nice writeup on the IE Internals blog which goes into some of the background to this  There are mixed reports IE11 supports longer URLs - see comments below  Given some people report issues  the general advice still stands  Search engines like URLs  lt  2048 chars    Be aware that the sitemaps protocol  which allows a site to inform search engines about available pages  has a limit of 2048 characters in a URL  If you intend to use sitemaps  a limit has been decided for you   see Calin-Andrei Burloiu s answer below  There s also some research from 2010 into the maximum URL length that search engines will crawl and index  They found the limit was 2047 chars  which appears allied to the sitemap protocol spec  However  they also found the Google SERP tool wouldn t cope with URLs longer than 1855 chars  CDNs have limits CDNs also impose limits on URI length  and will return a 414 Too long request when these limits are reached  for example   Fastly 8Kb CloudFront 8Kb CloudFlare 32Kb   credit to timrs2998 for providing that info in the comments  Additional browser roundup I tested the following against an Apache 2 4 server configured with a very large LimitRequestLine and LimitRequestFieldSize  Browser     Address bar   document location                           or anchor tag ------------------------------------------ Chrome          32779            gt 64k Android          8192            gt 64k Firefox           gt 64k            gt 64k Safari            gt 64k            gt 64k IE11             2047           5120 Edge 16          2047          10240  See also this answer from Matas Vaitkevicius below  Is this information up to date  This is a popular question  and as the original research is  14 years old I ll try to keep it up to date  As of Sep 2020  the advice still stands  Even though IE11 may possibly accept longer URLs  the ubiquity of older IE installations plus the search engine limitations mean staying under 2000 chars is the best general policy

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In URL as UI Jakob Nielsen recommends      the social interface to the Web relies on email when users want to recommend Web pages to each other  and email is the second-most common way users get to new sites  search engines being the most common   make sure that all URLs on your site are less than 78 characters long so that they will not wrap across a line feed    This is not the maximum but I d consider this a practical maximum if you want your URL to be shared

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The HTTP 1 1 specification says      URIs in HTTP can be represented in   absolute form or relative to some   known base URI  11   depending upon   the context of their use  The two   forms are differentiated by the fact   that absolute URIs always begin   with a scheme name followed by a   colon  For definitive information on   URL syntax and semantics  see  Uniform   Resource Identifiers  URI      Generic   Syntax and Semantics   RFC 2396  42     which replaces RFCs    1738  4  and   RFC 1808  11    This specification   adopts the    definitions of    URI-reference    absoluteURI      relativeURI    port      host   abs path    rel path   and    authority  from that   specification       The HTTP protocol does not place   any a priori limit on the length of   a URI  Servers MUST be able to handle   the URI of any resource they    serve    and SHOULD be able to handle URIs of   unbounded length if they    provide   GET-based forms that could generate   such URIs   A server    SHOULD return   414  Request-URI Too Long  status if a   URI is longer    than the server can   handle  see section 10 4 15        Note  Servers ought to be cautious about depending on URI   lengths         above 255 bytes  because some older client or proxy         implementations might not properly support these lengths    As mentioned by  Brian  the HTTP clients  e g  browsers  may have their own limits  and HTTP servers will have different limits

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In URL as UI Jakob Nielsen recommends      the social interface to the Web relies on email when users want to recommend Web pages to each other  and email is the second-most common way users get to new sites  search engines being the most common   make sure that all URLs on your site are less than 78 characters long so that they will not wrap across a line feed    This is not the maximum but I d consider this a practical maximum if you want your URL to be shared

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WWW FAQs  What is the maximum length of a URL  has its own answer based on empirical testing and research  The short answer is that going over 2048 characters makes Internet nbsp Explorer unhappy and thus this is the limit you should use  See the page for a long answer

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WWW FAQs  What is the maximum length of a URL  has its own answer based on empirical testing and research  The short answer is that going over 2048 characters makes Internet nbsp Explorer unhappy and thus this is the limit you should use  See the page for a long answer

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The HTTP 1 1 specification says      URIs in HTTP can be represented in   absolute form or relative to some   known base URI  11   depending upon   the context of their use  The two   forms are differentiated by the fact   that absolute URIs always begin   with a scheme name followed by a   colon  For definitive information on   URL syntax and semantics  see  Uniform   Resource Identifiers  URI      Generic   Syntax and Semantics   RFC 2396  42     which replaces RFCs    1738  4  and   RFC 1808  11    This specification   adopts the    definitions of    URI-reference    absoluteURI      relativeURI    port      host   abs path    rel path   and    authority  from that   specification       The HTTP protocol does not place   any a priori limit on the length of   a URI  Servers MUST be able to handle   the URI of any resource they    serve    and SHOULD be able to handle URIs of   unbounded length if they    provide   GET-based forms that could generate   such URIs   A server    SHOULD return   414  Request-URI Too Long  status if a   URI is longer    than the server can   handle  see section 10 4 15        Note  Servers ought to be cautious about depending on URI   lengths         above 255 bytes  because some older client or proxy         implementations might not properly support these lengths    As mentioned by  Brian  the HTTP clients  e g  browsers  may have their own limits  and HTTP servers will have different limits

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The URI RFC  of which URLs are a subset  doesn t define a maximum length  however  it does recommend that the hostname part of the URI  if applicable  not exceed 255 characters in length      URI producers should use names that   conform to the DNS syntax  even when   use of DNS is not immediately   apparent  and should limit these names   to no more than 255 characters in   length    As noted in other posts though  some browsers have a practical limitation on the length of a URL

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Short answer - de facto limit of 2000 characters If you keep URLs under 2000 characters  they ll work in virtually any combination of client and server software  If you are targeting particular browsers  see below for more details on specific limits  Longer answer - first  the standards    RFC 2616  Hypertext Transfer Protocol HTTP 1 1  section 3 2 1 says  The HTTP protocol does not place any a priori limit on the length of a URI  Servers MUST be able to handle the URI of any resource they    serve  and SHOULD be able to handle URIs of unbounded length if they    provide GET-based forms that could generate such URIs  A server    SHOULD return 414  Request-URI Too Long  status if a URI is longer    than the server can handle  see section 10 4 15    That RFC has been obsoleted by RFC7230 which is a refresh of the HTTP 1 1 specification  It contains similar language  but also goes on to suggest this   Various ad hoc limitations on request-line length are found in practice  It is RECOMMENDED that all HTTP senders and recipients support  at a minimum  request-line lengths of 8000 octets      and the reality That s what the standards say  For the reality  there was an article on boutell com  link goes to Internet Archive backup  that discussed what individual browser and server implementations will support  The executive summary is   Extremely long URLs are usually a mistake  URLs over 2 000 characters will not work in the most popular web browsers  Don t use them if you intend your site to work for the majority of Internet users    Note  this is a quote from an article written in 2006  but in 2015 IE s declining usage means that longer URLs do work for the majority  However  IE still has the limitation     Internet Explorer s limitations    IE8 s maximum URL length is 2083 chars  and it seems IE9 has a similar limit  I ve tested IE10 and the address bar will only accept 2083 chars  You can click a URL which is longer than this  but the address bar will still only show 2083 characters of this link  There s a nice writeup on the IE Internals blog which goes into some of the background to this  There are mixed reports IE11 supports longer URLs - see comments below  Given some people report issues  the general advice still stands  Search engines like URLs  lt  2048 chars    Be aware that the sitemaps protocol  which allows a site to inform search engines about available pages  has a limit of 2048 characters in a URL  If you intend to use sitemaps  a limit has been decided for you   see Calin-Andrei Burloiu s answer below  There s also some research from 2010 into the maximum URL length that search engines will crawl and index  They found the limit was 2047 chars  which appears allied to the sitemap protocol spec  However  they also found the Google SERP tool wouldn t cope with URLs longer than 1855 chars  CDNs have limits CDNs also impose limits on URI length  and will return a 414 Too long request when these limits are reached  for example   Fastly 8Kb CloudFront 8Kb CloudFlare 32Kb   credit to timrs2998 for providing that info in the comments  Additional browser roundup I tested the following against an Apache 2 4 server configured with a very large LimitRequestLine and LimitRequestFieldSize  Browser     Address bar   document location                           or anchor tag ------------------------------------------ Chrome          32779            gt 64k Android          8192            gt 64k Firefox           gt 64k            gt 64k Safari            gt 64k            gt 64k IE11             2047           5120 Edge 16          2047          10240  See also this answer from Matas Vaitkevicius below  Is this information up to date  This is a popular question  and as the original research is  14 years old I ll try to keep it up to date  As of Sep 2020  the advice still stands  Even though IE11 may possibly accept longer URLs  the ubiquity of older IE installations plus the search engine limitations mean staying under 2000 chars is the best general policy

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On Apple platforms  iOS macOS tvOS watchOS   the limit may be a 2 GB long URL scheme  as seen by this comment in the source code of Swift         Make sure the URL string isn t too long     We re limiting it to 2GB for backwards compatibility with 32-bit executables using NS CFURL if    urlStringLength  gt  0   amp  amp   urlStringLength  lt   INT MAX               On iOS  I ve tested and confirmed that even a 300  MB long URL is accepted  You can try such a long URL like this in Objective-C   NSString  path      a   stringByPaddingToLength 314572800 withString   a  startingAtIndex 0   NSString  js    NSString stringWithFormat   window location href             path    self webView stringByEvaluatingJavaScriptFromString js     And catch if it succeed with   -  BOOL webView  UIWebView   webView shouldStartLoadWithRequest  NSURLRequest   request navigationType  UIWebViewNavigationType navigationType       NSLog   length         request URL absoluteString length        return YES

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Just remove or comment the following lines  public void ConfigureServices IServiceCollection services     Identity  services AddDbContext options   gt  options UseSqlServer Configuration  quot ConnectionStrings IdentityConnection quot      services AddIdentity lt AppUser  IdentityRole gt    AddEntityFrameworkStores   AddDefaultTokenProviders     End            Identity Login Url            services ConfigureApplicationCookie opts   gt  opts LoginPath    quot  Login quot             services AddMvc              Authorization           services AddMvc config   gt                            var policy   new AuthorizationPolicyBuilder                                  RequireAuthenticatedUser                                  Build                  config Filters Add new AuthorizeFilter policy

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The URI RFC  of which URLs are a subset  doesn t define a maximum length  however  it does recommend that the hostname part of the URI  if applicable  not exceed 255 characters in length      URI producers should use names that   conform to the DNS syntax  even when   use of DNS is not immediately   apparent  and should limit these names   to no more than 255 characters in   length    As noted in other posts though  some browsers have a practical limitation on the length of a URL

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Why is the Internet nbsp Explorer limit only 2K while IIS has a limit of 16K  I don t think it makes sense   So I want to start an experiment about Ajax request URL size limits   I have set my Tomcat HTTP connector s maxHttpHeaderSize  1048576   And prepared a very long URL   Then I send a request with the long URL like the following   var url   ajax url-length jsp   jQuery ajax url  data  q  0  repeat 1048000-url length-4        jQuery reports done  Tomcat reports the URL requested is 1048015 bytes  It was tested with Chrome 50 and Internet nbsp Explorer nbsp 11   So web browsers won t truncate or limit your URL intentionally when sending Ajax requests

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The HTTP 1 1 specification says      URIs in HTTP can be represented in   absolute form or relative to some   known base URI  11   depending upon   the context of their use  The two   forms are differentiated by the fact   that absolute URIs always begin   with a scheme name followed by a   colon  For definitive information on   URL syntax and semantics  see  Uniform   Resource Identifiers  URI      Generic   Syntax and Semantics   RFC 2396  42     which replaces RFCs    1738  4  and   RFC 1808  11    This specification   adopts the    definitions of    URI-reference    absoluteURI      relativeURI    port      host   abs path    rel path   and    authority  from that   specification       The HTTP protocol does not place   any a priori limit on the length of   a URI  Servers MUST be able to handle   the URI of any resource they    serve    and SHOULD be able to handle URIs of   unbounded length if they    provide   GET-based forms that could generate   such URIs   A server    SHOULD return   414  Request-URI Too Long  status if a   URI is longer    than the server can   handle  see section 10 4 15        Note  Servers ought to be cautious about depending on URI   lengths         above 255 bytes  because some older client or proxy         implementations might not properly support these lengths    As mentioned by  Brian  the HTTP clients  e g  browsers  may have their own limits  and HTTP servers will have different limits

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The HTTP 1 1 specification says      URIs in HTTP can be represented in   absolute form or relative to some   known base URI  11   depending upon   the context of their use  The two   forms are differentiated by the fact   that absolute URIs always begin   with a scheme name followed by a   colon  For definitive information on   URL syntax and semantics  see  Uniform   Resource Identifiers  URI      Generic   Syntax and Semantics   RFC 2396  42     which replaces RFCs    1738  4  and   RFC 1808  11    This specification   adopts the    definitions of    URI-reference    absoluteURI      relativeURI    port      host   abs path    rel path   and    authority  from that   specification       The HTTP protocol does not place   any a priori limit on the length of   a URI  Servers MUST be able to handle   the URI of any resource they    serve    and SHOULD be able to handle URIs of   unbounded length if they    provide   GET-based forms that could generate   such URIs   A server    SHOULD return   414  Request-URI Too Long  status if a   URI is longer    than the server can   handle  see section 10 4 15        Note  Servers ought to be cautious about depending on URI   lengths         above 255 bytes  because some older client or proxy         implementations might not properly support these lengths    As mentioned by  Brian  the HTTP clients  e g  browsers  may have their own limits  and HTTP servers will have different limits

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According to the HTTP spec  there is no limit to a URL s length  Keep your URLs under 2048 characters  this will ensure the URLs work in all clients  amp  server configurations  Also  search engines like URLs to remain under approximately 2000 characters

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There is really no universal maximum URL length  The max length is determined only by what the client browser chooses to support  which varies widely  The 2 083 limit is only present in Internet Explorer  all versions up to 7 0   The max length in Firefox and Safari seems to be unlimited  although instability occurs with URLs reaching around 65 000 characters  Opera seems to have no max URL length whatsoever  and doesn t suffer instability at extremely long lengths

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The URI RFC  of which URLs are a subset  doesn t define a maximum length  however  it does recommend that the hostname part of the URI  if applicable  not exceed 255 characters in length      URI producers should use names that   conform to the DNS syntax  even when   use of DNS is not immediately   apparent  and should limit these names   to no more than 255 characters in   length    As noted in other posts though  some browsers have a practical limitation on the length of a URL

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It seems that Chrome at least has raised this limit  I pasted 20 000 characters into the bookmarklet and it took it

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Short answer - de facto limit of 2000 characters If you keep URLs under 2000 characters  they ll work in virtually any combination of client and server software  If you are targeting particular browsers  see below for more details on specific limits  Longer answer - first  the standards    RFC 2616  Hypertext Transfer Protocol HTTP 1 1  section 3 2 1 says  The HTTP protocol does not place any a priori limit on the length of a URI  Servers MUST be able to handle the URI of any resource they    serve  and SHOULD be able to handle URIs of unbounded length if they    provide GET-based forms that could generate such URIs  A server    SHOULD return 414  Request-URI Too Long  status if a URI is longer    than the server can handle  see section 10 4 15    That RFC has been obsoleted by RFC7230 which is a refresh of the HTTP 1 1 specification  It contains similar language  but also goes on to suggest this   Various ad hoc limitations on request-line length are found in practice  It is RECOMMENDED that all HTTP senders and recipients support  at a minimum  request-line lengths of 8000 octets      and the reality That s what the standards say  For the reality  there was an article on boutell com  link goes to Internet Archive backup  that discussed what individual browser and server implementations will support  The executive summary is   Extremely long URLs are usually a mistake  URLs over 2 000 characters will not work in the most popular web browsers  Don t use them if you intend your site to work for the majority of Internet users    Note  this is a quote from an article written in 2006  but in 2015 IE s declining usage means that longer URLs do work for the majority  However  IE still has the limitation     Internet Explorer s limitations    IE8 s maximum URL length is 2083 chars  and it seems IE9 has a similar limit  I ve tested IE10 and the address bar will only accept 2083 chars  You can click a URL which is longer than this  but the address bar will still only show 2083 characters of this link  There s a nice writeup on the IE Internals blog which goes into some of the background to this  There are mixed reports IE11 supports longer URLs - see comments below  Given some people report issues  the general advice still stands  Search engines like URLs  lt  2048 chars    Be aware that the sitemaps protocol  which allows a site to inform search engines about available pages  has a limit of 2048 characters in a URL  If you intend to use sitemaps  a limit has been decided for you   see Calin-Andrei Burloiu s answer below  There s also some research from 2010 into the maximum URL length that search engines will crawl and index  They found the limit was 2047 chars  which appears allied to the sitemap protocol spec  However  they also found the Google SERP tool wouldn t cope with URLs longer than 1855 chars  CDNs have limits CDNs also impose limits on URI length  and will return a 414 Too long request when these limits are reached  for example   Fastly 8Kb CloudFront 8Kb CloudFlare 32Kb   credit to timrs2998 for providing that info in the comments  Additional browser roundup I tested the following against an Apache 2 4 server configured with a very large LimitRequestLine and LimitRequestFieldSize  Browser     Address bar   document location                           or anchor tag ------------------------------------------ Chrome          32779            gt 64k Android          8192            gt 64k Firefox           gt 64k            gt 64k Safari            gt 64k            gt 64k IE11             2047           5120 Edge 16          2047          10240  See also this answer from Matas Vaitkevicius below  Is this information up to date  This is a popular question  and as the original research is  14 years old I ll try to keep it up to date  As of Sep 2020  the advice still stands  Even though IE11 may possibly accept longer URLs  the ubiquity of older IE installations plus the search engine limitations mean staying under 2000 chars is the best general policy

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ASP NET 2 and SQL Server reporting services 2005 have a limit of 2028  I found this out the hard way  where my dynamic URL generator would not pass over some parameters to a report beyond that point  This was under Internet nbsp Explorer nbsp 8

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Sitemaps protocol  which is a way for webmasters to inform search engines about pages on their sites  also used by Google in Webmaster Tools   supports URLs with less than 2048 characters  So if you are planning to use this feature for Search Engine Optimization  take this into account

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Limit request line directive sets the maximum length of a URL  By default  it is set to 8190  which gives you a lot of room  However other servers and some browses  limit the length more   Because all parameters are passed on the URL line  items that were in password of hidden fields will also be displayed in the URL of course  Neither mobile should be used for real security measures and should be considered cosmetic security at best

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It seems that Chrome at least has raised this limit  I pasted 20 000 characters into the bookmarklet and it took it

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I wrote this test that keeps on adding  a  to parameter until the browser fails  C  part    AcceptVerbs HttpVerbs Get   public ActionResult ParamTest string x        ViewBag TestLength   0      if   string IsNullOrEmpty x                 System IO File WriteAllLines  c  result txt                          new    Request UserAgent  x Length ToString              ViewBag TestLength   x Length   1             return View        View    lt script src    ajax googleapis com ajax libs jquery 1 9 1 jquery min js  gt  lt  script gt    lt script type  text javascript  gt        function             var text    a           for  var i   0  i  lt  parseInt  ViewBag TestLength -1  i                  text     a                      document location href    http   localhost 50766 Home ParamTest x     text           lt  script gt    PART 1  On Chrome I got   Mozilla 5 0  Windows NT 6 1  WOW64  AppleWebKit 537 36  KHTML  like Gecko  Chrome 43 0 2357 130 Safari 537 36 2046   It then blew up with      HTTP Error 404 15 - Not Found The request filtering module is   configured to deny a request where the query string is too long    Same on Internet nbsp Explorer nbsp 8 and Firefox  Mozilla 4 0  compatible  MSIE 8 0  Windows NT 6 1  WOW64  Trident 4 0  SLCC2   NET CLR 2 0 50727   NET CLR 3 5 30729   NET CLR 3 0 30729   NET4 0C   NET4 0E  2046  Mozilla 5 0  Windows NT 6 1  WOW64  rv 38 0  Gecko 20100101 Firefox 38 0 2046   PART 2  I went easy mode and added additional limits to IISExpress applicationhost config and web config setting maxQueryStringLength  32768    Chrome failed with message  Bad Request - Request Too Long  HTTP Error 400  The size of the request headers is too long    after 7744 characters   Mozilla 5 0  Windows NT 6 1  WOW64  AppleWebKit 537 36  KHTML  like Gecko  Chrome 43 0 2357 130 Safari 537 36 7744   PART 3  Added   lt headerLimits gt       lt add header  Content-type  sizeLimit  32768    gt   lt  headerLimits gt    which didn t help at all  I finally decided to use fiddler to remove the referrer from header   static function OnBeforeRequest oSession  Session        if  oSession url Contains  localhost 50766              oSession RequestHeaders Remove  Referer            Which did nicely   Chrome  got to 15613 characters   I guess it s a 16K limit for IIS   And it failed again with    lt BODY gt  lt h2 gt Bad Request - Request Too Long lt  h2 gt   lt hr gt  lt p gt HTTP Error 400  The size of the request headers is too long  lt  p gt    Mozilla 5 0  Windows NT 6 1  WOW64  AppleWebKit 537 36  KHTML  like Gecko  Chrome 43 0 2357 130 Safari 537 36 15613   Firefox   Mozilla 5 0  Windows NT 6 1  WOW64  rv 38 0  Gecko 20100101 Firefox 38 0 15708   Internet Explorer 8 failed with iexplore exe crashing     After 2505  Mozilla 4 0  compatible  MSIE 8 0  Windows NT 6 1  WOW64  Trident 4 0  SLCC2   NET CLR 2 0 50727   NET CLR 3 5 30729   NET CLR 3 0 30729   NET4 0C   NET4 0E  2505   Android Emulator  Mozilla 5 0  Linux  Android 5 1  Android SDK built for x86 Build LKY45  AppleWebKit 537 36  KHTML  like Gecko  Version 4 0 Chrome 39 0 0 0 Mobile Safari 537 36 7377   Internet Explorer 11  Mozilla 4 0  compatible  MSIE 7 0  Windows NT 6 1  Trident 7 0  SLCC2   NET CLR 2 0 50727   NET CLR 3 5 30729   NET CLR 3 0 30729  Media Center PC 6 0   NET4 0C  4043   Internet Explorer 10  Mozilla 4 0  compatible  MSIE 7 0  Windows NT 6 1  Trident 6 0  SLCC2   NET CLR 2 0 50727   NET CLR 3 5 30729   NET CLR 3 0 30729  Media Center PC 6 0   NET4 0C  4043   Internet Explorer 9  Mozilla 5 0  compatible  MSIE 9 0  Windows NT 6 1  Trident 5 0  4043

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Just remove or comment the following lines  public void ConfigureServices IServiceCollection services     Identity  services AddDbContext options   gt  options UseSqlServer Configuration  quot ConnectionStrings IdentityConnection quot      services AddIdentity lt AppUser  IdentityRole gt    AddEntityFrameworkStores   AddDefaultTokenProviders     End            Identity Login Url            services ConfigureApplicationCookie opts   gt  opts LoginPath    quot  Login quot             services AddMvc              Authorization           services AddMvc config   gt                            var policy   new AuthorizationPolicyBuilder                                  RequireAuthenticatedUser                                  Build                  config Filters Add new AuthorizeFilter policy

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I have experience with SharePoint 2007  2010 and there is a limit of the length URL you can create from the server side in this case SharePoint  so it depends mostly on  1  the client  browser  version  and OS  and 2  the server technology  IIS  Apache  etc

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The URI RFC  of which URLs are a subset  doesn t define a maximum length  however  it does recommend that the hostname part of the URI  if applicable  not exceed 255 characters in length      URI producers should use names that   conform to the DNS syntax  even when   use of DNS is not immediately   apparent  and should limit these names   to no more than 255 characters in   length    As noted in other posts though  some browsers have a practical limitation on the length of a URL

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WWW FAQs  What is the maximum length of a URL  has its own answer based on empirical testing and research  The short answer is that going over 2048 characters makes Internet nbsp Explorer unhappy and thus this is the limit you should use  See the page for a long answer

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Sitemaps protocol  which is a way for webmasters to inform search engines about pages on their sites  also used by Google in Webmaster Tools   supports URLs with less than 2048 characters  So if you are planning to use this feature for Search Engine Optimization  take this into account

User · Answer

I have experience with SharePoint 2007  2010 and there is a limit of the length URL you can create from the server side in this case SharePoint  so it depends mostly on  1  the client  browser  version  and OS  and 2  the server technology  IIS  Apache  etc

User · Answer

There is really no universal maximum URL length  The max length is determined only by what the client browser chooses to support  which varies widely  The 2 083 limit is only present in Internet Explorer  all versions up to 7 0   The max length in Firefox and Safari seems to be unlimited  although instability occurs with URLs reaching around 65 000 characters  Opera seems to have no max URL length whatsoever  and doesn t suffer instability at extremely long lengths

User · Answer

According to the HTTP spec  there is no limit to a URL s length  Keep your URLs under 2048 characters  this will ensure the URLs work in all clients  amp  server configurations  Also  search engines like URLs to remain under approximately 2000 characters

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The longest URLs I came across are data URLs  Example image URL from Google image results  11747 characters   data image jpeg base64  9j 4AAQSkZJRgABAQAAAQABAAD 2wCEAAkGBhQSERIUExQUFRUUFxcXFhQYFBQXGBgYFhkVGBkVFxUXHCYfGBojGRQVHy8gJCcpLCwsFh4xNTAqNSYrLCkBCQoKDgwOGg8PGiokHyQpLDUqKSwsLCksKSwpKSwsLCwpKSkpLCwpLCksKSwpLCkpLCwsLCkpKSwsLCwsLDQsLP AABEIAM0A9gMBIgACEQEDEQH xAAcAAACAgMBAQAAAAAAAAAAAAAABQQGAgMHAQj xABTEAACAAQCBAcLBgsFBwUAAAABAgADBBESIQUGMUEHEyJRYYGRFBYyVHF0lKGxs9IjNEKS0dMXMzVSYmRypMHj8GOTo7LiJENzosLh8RVTgoPD 8QAGQEBAAMBAQAAAAAAAAAAAAAAAAECAwQF 8QAJxEAAgIBAwMEAgMAAAAAAAAAAAECEQMSITEEE0EiUWGBkfAyceH 2gAMAwEAAhEDEQA AOiaq6q0b0NGzUlMzNTySWMiUSSZaEkkrmbw17z6LxOl9HlfDBqf8wovNpHu0hvACjvPovE6X0eV8MHefReJ0vo8r4YbwQAo7z6LxOl9HlfDB3n0XidL6PK GG8EAKO8 i8TpfR5Xwwd59F4nS jyvhhsTaKnX69gzGlUiCc6 FMZsMpTuBYAlj0LnFoxcuCG0ht3n0XidL6PK GDvPovE6X0eV8MIX0jpQ8pe5SPzeKndmLFl2QuPCpMpnwV1Pg345ZuLc4DbfbG0enlJelp ZR5EuS3959F4nS jyvhg7z6LxOl9HlfDDCjrFmosxCSrgMLixsdmRzEb45zQUd59F4nS jyvhg7z6LxOl9HlfDDeCAFHefReJ0vo8r4YO8 i8TpfR5Xww3ggBR3n0XidL6PK GDvPovE6X0eV8MN4IAUd59F4nS jyvhg7z6LxOl9HlfDDeFOsNVMlSmmI1gguRhBJ6zsispaVZWclGLkzzvPovE6X0eV8MHefReJ0vo8r4YR8HOsM6slzZk1sXyhC5KoVRsGQuTe fRFzhGWpJkQlripIUd59F4nS jyvhg7z6LxOl9HlfDDeCLFxR3n0XidL6PK GDvPovE6X0eV8MTarSUuX4TAHm2nsELn1vkA T8uA 8An1RFommbO8 i8TpfR5Xwwd59F4nS jyvhiTRabkzckcE82w9hibeJIFPefReJ0vo8r4YO8 i8TpfR5Xww3ggDlfDJoCmk0MppVPIlsahRdJUtDbi5xsSq7LgZdEET HL8nyvOU93OggC3an ADCi82ke7SG8KNT AJhRebSPdpDeACCCCACCCCAKJwqawtIpxKlmzzSF sbD7Yaal6spTyJeWdt PvY pE3zig8LVYe7pSnwZZlP1XzPqMdfoyMC22WFvJHZnjoxwS8qzDG9UpG20J9YNWJVWJfGC5ltiXmB57b4cXjwuI5E2uDdmqlplloFXYP6vCys1slI5lqHmzB4SSlxlf2jsXtjXrjpjuelmMu2xAPNkbwk4M9HiZRS5r5mZdzfezE3Y9OQjFybnpR0RxKOLuy8ukNqTXymeZxTFpT3ACzVKZndfZ64sQaKRwk6qpOpjNVbTJViLb1ORB6M7xp4NdZ2mULrNbE9OxTEdpXIrfpAyjKWftatfhWbz6eMsKzY emvZ BcazSySzhJJb81QS3YI0S9Y5RNiSh SFor2qMs1Lz5sw35ZFvJYAeS1oe6Y0KjSyVADKLgjo3Rjrzyw92LV1aVePa 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User · Answer

Microsoft Support says  Maximum URL length is 2 083 characters in Internet Explorer    IE has problems with URLs longer than that  Firefox seems to work fine with  4k chars

[http] What is the maximum length of a URL in different browsers?

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