Proper MIME type for OTF fonts

Question

Searching the web  I find heaps of different suggestions for what the proper MIME type for a font is  but I have yet to try any MIME type that rids me of a Chrome warning such as the following      Resource interpreted as font but transferred with MIME type font otf   The font is an OTF   I ve tried the following MIME types so far   font otf application font-otf application font application otf application octet-stream application x-font-otf application x-font-TrueType  I know it s not truetype  but one source quoted this for OTF

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The following can be used in the eBook space    application vnd ms-opentype   I would imagine that it is the same for the web

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FWIW regarding Apache 2 2 VirtualHosting and mod mime tested on Debian Linux and OS X Leopard and Snow Leopard   If you have a VirtualHost configuration you will want to add the types via the AddType Directive as follows at least at the bottom of the configuration as follows           AddType font opentype  otf    AddType font ttf  ttf  lt  VirtualHost gt    Tested against Chrome Unstable Trunk and Safari WebKit Nightly which eliminates the mime octet-stream warnings for both the ttf and otf font types   Note   htaccess has zero effect when dealing with VirtualHosting  If you re developing for several sites you ll be using VirtualHosting development and each configuration will need these AddType additions

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Try using  font opentype

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Since Feb 2017 RFC 8081 groups all MIME types for fonts under the top level font media type  The older MIME types from my original posting are now listed as deprecated   Font types as listed by IANA are now     otf   - gt  font otf  sfnt  - gt  font sfnt  ttf   - gt  font ttf  woff  - gt  font woff  woff2 - gt  font woff2   Other non-standard font formats are left as are     eot - gt  application vnd ms-fontobject  as from December 2005   svg - gt  image svg xml  as from August 2011       Outdated Original Post   As there s still a lot of confusion on the web about MIME types for web fonts  I thought I d give a current answer  complete with effective dates  and supporting links to IANA and the W3C   Here are the official MIME types for Web Fonts      eot - gt  application vnd ms-fontobject  as from December 2005   otf - gt  application font-sfnt  as from March 2013   svg - gt  image svg xml  as from August 2011   ttf - gt  application font-sfnt  as from March 2013   woff - gt  application font-woff  as from January 2013   woff2 - gt  font woff2  proposed by W3C in March 2016    Note there is a movement to change all the above to MIME types of font XXX  as backed by the W3C in its proposal for WOFF v2  This is being tracked by the Internet Engineering Task Force  IETF  under The font Top Level Type and in February 2017 was approved RFC status  see RFC 8081  so it may all change yet   While on the topic of web servers  it s worth mentioning that HTTP responses may gzip  or otherwise compress  all the above font formats except  woff  amp   woff2 which are already heavily compressed    I say more in MIME Types for Web Fonts with  Fantom  BedSheet

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One way to silence this warning from Chrome would be to update Chrome and then make sure your mime type is one of these     font ttf    font opentype    application font-woff    application x-font-type1    application x-font-ttf    application x-truetype-font    This list is per the patch found at Bug 111418 at webkit org   The same patch demotes the message from a  Warning  to a  Log   so just upgrading Chrome to any post March-2013 version would get rid of the yellow triangle   Since the question is about silencing a Chrome warning  and folks might be holding on to old Chrome versions for whatever reasons  I figured this was worth adding

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Ignore the chrome warning  There is no standard MIME type for OTF fonts  font opentype may silence the warning  but that doesn t make it the  quot right quot  thing to do  Arguably  you re better off making one up  e g  with  quot application x-opentype quot  because at least  quot application quot  is a registered content type  while  quot font quot  is not  Update  OTF remains a problem  but WOFF grew an IANA MIME type of application font-woff in January 2013  Update 2  OTF  has grown a MIME type   application font-sfnt In March 2013   This type also applies to  ttf

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I just did some research on IANA official list  I believe the answer given here  font xxx  is incorrect as there is no  font  type in the MIME standard   Based on the RFCs and IANA  this appears to be the current state of the play as at May 2013   These three are official and assigned by IANA    svg  as  image svg xml  woff as  application font-woff   eot  as  application vnd ms-fontobject    These are not not official assigned  and so must use the  x-  syntax    ttf  as  application x-font-ttf  otf  as  application x-font-opentype    The application font-woff appears new and maybe only official since Jan 2013  So  application x-font-woff  might be safer more compatible in the short term

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Maybe this will help someone  I saw that on IIS 7  ttf is already a known mime-type  It s configured as   application octet-stream   So I just added that for all the CSS font types   oet   svg   ttf   woff  and IIS started serving them  Chrome dev tools also do not complain about re-interpreting the type   Cheers  Michael

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As a specific instance of one of the two hard things in computing  it   s interesting to see how the answers to this question have changed since this question was originally posted  Thankfully  the powers that be have brought order to the chaos     In February this year  2017   the W3C published the Standards Track RFC 8081  The  font  Top-Level Media Type which greatly simplifies the appropriate media types for font files      This memo serves to register and document the  font  top-level media type    under which subtypes for representation formats for fonts may be registered    This document also serves as a registration application for a set of   intended subtypes  which are representative of some existing subtypes   already in use  and currently registered under the  application  tree by   their separate registrations    It   s quite a readable document and it describes the historical context  lack of    a registration of formats for font     which gave rise to the confusing mix of media types and sub-types  With the  relatively  recent rise in popularity of downloadable web fonts  the W3C recognised the need for an    intuitive top-level font type      What they came up with is     font   Accordingly  the IANA have since updated their official list of Media types with the font media type and all its sub-types that they currently recognise   collection  font collection otf     font otf sfnt    font sfnt ttf     font ttf woff    font woff woff2   font woff2   Here   s hoping this is the last answer this question needs

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As of February 2017  RFC 8081 adds font   media types  which are also listed in the IANA Media Types list  font otf is in this list

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There are a number of font formats that one can set MIME types for  on both Apache and IIS servers  I ve traditionally had luck with the following   svg   as  image svg xml                    W3C  August 2011  ttf   as  application x-font-ttf           IANA  March 2013        or  application x-font-truetype  otf   as  application x-font-opentype      IANA  March 2013  woff  as  application font-woff            IANA  January 2013  woff2 as  application font-woff2           W3C W  E Draft  May 2014 March 2016  eot   as  application vnd ms-fontobject    IANA  December 2005  sfnt  as  application font-sfnt            IANA  March 2013     According to the Internet Engineering Task Force who maintain the initial document regarding Multipurpose Internet Mail Extensions  MIME types  here  http   tools ietf org html rfc2045 section-5     it says in specifics       It is expected that additions to the larger set of      supported types can generally be accomplished by the creation of new      subtypes of these initial types   In the future  more top-level types      may be defined only by a standards-track extension to this standard       If another top-level type is to be used for any reason  it must be      given a name starting with  X-  to indicate its non-standard status      and to avoid a potential conflict with a future official name     As it were  and over time  additional MIME types get added as standards are created and accepted  therefor we see examples of vendor specific MIME types such as vnd ms-fontobject and the like   UPDATE August 16  2013  WOFF was formally registered at IANA on January 3  2013 and Webkit has been updated on March 5  2013 and browsers that are sourcing this update in their latest versions will start issuing warnings about the server MIME types with the old x-font-woff declaration  Since the warnings are only annoying I would recommend switching to the approved MIME type right away  In an ideal world  the warnings will resolve themselves in time   UPDATE February 26  2015  WOFF2 is now in the W3C Editor s Draft with the proposed mime-type  It should likely be submitted to IANA in the next year  possibly by end of 2016  following more recent progress timelines  As well SFNT  the scalable spline container font format used in the backbone table reference of Google Web Fonts with their sfntly java library and is already registered as a mime type with IANA and could be added to this list as well dependent on individual need   UPDATE October 4  2017  We can follow the progression of the WOFF2 format here with a majority of modern browsers supporting the format successfully  As well  we can follow the IETF s  font  Top-Level Media Type request for comments  RFC  tracker and document regarding the latest set of proposed font types for approval     For those wishing to embed the typeface in the proper order in your CSS please visit this article  But again  I ve had luck with the following order    font-face       font-family   my-web-font       src  url  webfont eot        src  url  webfont eot  iefix   format  embedded-opentype             url  webfont woff2   format  woff2             url  webfont woff   format  woff             url  webfont ttf   format  truetype             url  webfont svg webfont   format  svg        font-weight  normal      font-style  normal        For Subversion auto-properties  these can be listed as     Font formats svg     svn mime-type image svg xml ttf     svn mime-type application x-font-ttf otf     svn mime-type application x-font-opentype woff    svn mime-type application font-woff woff2   svn mime-type application font-woff2 eot     svn mime-type application vnd ms-fontobject sfnt    svn mime-type application font-sfnt

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Here is NGINX solution  file   usr local nginx conf mime types   add  font ttf                      ttf  font opentype                 otf  application font-woff         woff2  application font-woff         woff  application vnd ms-fontobject eot    remove  application octet-stream        eot    Thanks to Mike Fulcher  http   drawingablank me blog font-mime-types-in-nginx html

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application font-woff for woff  http   www iana org assignments media-types application font-woff

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As from March 2013 IANA ORG recommends for  otf  application font-sfnt  Other fonts     eot  - gt   application vnd ms-fontobject  as from December 2005   otf  - gt   application font-sfnt          as from March 2013   svg  - gt   image svg xml                  as from August 2011   ttf  - gt   application font-sfnt          as from March 2013   woff - gt   application font-woff          as from January 2013    See more

[fonts] Proper MIME type for OTF fonts

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