What is the maximum length of a Push Notification alert text

Question

What is the maximum length of the alert text of an iOS push notification   The documentation states that the notification payload has to be under 256 bytes in total  but surely there must be a specific character limit for the alert text

User · Answer

According to updated Apple document  check my answer date             When using the HTTP 2 provider API  maximum payload size is 4096   bytes  Using the legacy binary interface  maximum payload size is 2048   bytes  Apple Push Notification service  APNs  refuses any notification   that exceeds the maximum size

User · Answer

It should be 236 bytes  There is no restriction on the size of the alert text as far as I know  but only the total payload size  So considering if the payload is minimal and only contains the alert information  it should look like     aps    alert         That takes up 20 characters  20 bytes   leaving 236 bytes to put inside the alert string  With ASCII that will be 236 characters  and could be lesser with UTF8 and UTF16

User · Answer

The real limits for the alert text are not documented anywhere  The only thing the documentation says is      In iOS 8 and later  the maximum size allowed for a notification payload is 2 kilobytes  Apple Push Notification Service refuses any notification that exceeds this limit   Prior to iOS 8 and in OS X  the maximum payload size is 256 bytes     This is what I could find doing some experiments    Alerts  Prior to iOS 7  the alerts display limit was 107 characters  Bigger messages were truncated and you would get a       at the end of the displayed message  With iOS 7 the limit seems to be increased to 235 characters  If you go over 8 lines your message will also get truncated  Banners   Banners get truncated around 62 characters or 2 lines  Notification Center  The messages in the notification center get truncated around 110 characters or 4 lines  Lock Screen  Same as a notification center    Just as a reminder here is a very good note from the official documentation      If necessary  iOS truncates your message so that it fits well in each notification delivery style  for best results  you shouldn   t truncate your message

User · Answer

Apple push will reject a string for a variety of reasons  I tested a variety of scenarios for push delivery  and this was my working fix  in python       Apple rejects push payloads  gt  256 bytes  truncate msg to  lt  120 bytes to be safe  if len push str   gt  120      push str   push str 0 120-3             Apple push rejects all quotes  remove them import re push str   re sub              push str     Apple push needs to newlines escaped import MySQLdb push str   MySQLdb escape string push str     send it import APNSWrapper wrapper   APNSWrapper APNSNotificationWrapper certificate      message   APNSWrapper APNSNotification   message token      message badge 1  message alert push str  message sound  default   wrapper append message  wrapper notify

User · Answer

Here re some screenshots  banner  alert   amp  notification center

User · Answer

see my test here   I could send up to 33 Chinese characters and 13 bytes of custom values

User · Answer

According to the WWDC 713 hd whats new in ios notifications  The previous size limit of 256 bytes for a push payload has now been increased to 2 kilobytes for iOS 8   Source  http   asciiwwdc com 2014 sessions 713 q notification 1414 0

User · Answer

The limit of the enhanced format notifications is documented here   It explicitly states      The payload must not exceed 256 bytes and must not be null-terminated    ascandroli claims above that they were able to send messages with 1400 characters  My own testing with the new notification format showed that a message just 1 byte over the 256 byte limit was rejected   Given that the docs are very explicit on this point I suggest it is safer to use 256 regardless of what you may be able to achieve experimentally as there is no guarantee Apple won t change it to 256 in the future   As for the alert text itself  if you can fit it in the 256 total payload size then it will be displayed by iOS  They truncate the message that shows up on the status bar  but if you open the notification center  the entire message is there  It even renders newline characters  n

User · Answer

EDIT   Updating the answer with latest information  The maximum size allowed for a notification payload depends on which provider API you employ   When using the legacy binary interface  maximum payload size is 2KB  2048 bytes    When using the HTTP 2 provider API  maximum payload size is 4KB  4096 bytes   For Voice over Internet Protocol  VoIP  notifications  the maximum size is 5KB  5120 bytes   OLD ANSWER  According to the apple doc the payload for iOS 8 is 2 kilobytes  2048 bytes  and 256 bytes for iOS 7 and prior   removed the link as it was an old doc and it s broken now   So if you just send text you have 2028  iOS 8   or 236  iOS 7-  characters available      The Notification Payload      Each remote notification includes a payload  The payload contains   information about how the system should alert the user as well as any   custom data you provide  In iOS 8 and later  the maximum size allowed   for a notification payload is 2 kilobytes  Apple Push Notification   service refuses any notification that exceeds this limit   Prior to   iOS 8 and in OS X  the maximum payload size is 256 bytes     But I ve tested and you can send 2 kilobytes to iOS 7 devices too  even in production configurations

User · Answer

For regular remote notifications  the maximum size is 4KB  4096 bytes  https   developer apple com library content documentation NetworkingInternet Conceptual RemoteNotificationsPG CreatingtheNotificationPayload html     iOS the size limit is 256 bytes  but since the introduction of iOS 8 has changed to 2kb   https   forums aws amazon com ann jspa annID 2626     With iOS 8  Apple introduced new features that enable some rich new   use cases for mobile push notifications     interactive push   notifications  third party widgets  and larger  2 KB  payloads  Today    we are pleased to announce support for the new mobile push   capabilities announced with iOS 8  We are publishing a new iOS 8   Sample App that demonstrates how these new features can be implemented   with SNS  and have also implemented support for larger 2KB payloads

User · Answer

Apple Updated Doc     Each remote notification includes a payload  The payload contains information about how the system should alert the user as well as any custom data you provide  The maximum size allowed for a notification payload depends on which provider API you employ  When using the HTTP 2 provider API  maximum payload size is 4096 bytes  Using the legacy binary interface  maximum payload size is 2048 bytes  Apple Push Notification service  APNs  refuses any notification that exceeds the maximum size

[iphone] What is the maximum length of a Push Notification alert text?

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