Is there a character limit on Azure Notification Hub push message size?

Question

Is there a character limit on Azure Notification Hub push message size?

Thomas Kelly 25

I'd like to know if there is any limit on the number of characters for each push sent by Azure Notifications Hub. I think I read somewhere that there is a size limit of 4kb per push, but I cannot locate the resource that mentioned that. If possible, I'd prefer to learn the character limit as this will be more relatable to my management teams.

Tech-Hyd-1989 5,816 Reputation points

2023-09-26T09:34:09.01+00:00
Hello Thomas Kelly

Yes, there is a character limit for push notifications sent by Azure Notification Hubs. The character limit is 4KB. This means that the entire push notification, including the title, message, and any custom data, must be less than 4KB in size.

The character limit is in place to ensure that push notifications are delivered reliably and efficiently. Push notifications are typically truncated if they exceed the character limit, which can lead to a poor user experience.

To avoid exceeding the character limit, you can use the following tips:

Keep the title and message of your push notifications concise.

Avoid using images or videos in your push notifications.

Use custom data to store additional information that is not essential to the push notification.

If you need to send a push notification that is larger than 4KB, you can use a third-party service such as Firebase Cloud Messaging or Amazon Simple Notification Service (SNS). These services offer more flexible character limits and other features.

Here are some additional things to keep in mind:

The character limit for push notifications varies depending on the platform. For example, the character limit for iOS push notifications is 256 bytes.

The character limit for push notifications also depends on the format of the push notification. For example, JSON push notifications have a smaller character limit than XML push notifications.

I hope this helps! Let me know if you have any other questions.
Thomas Kelly 25 Reputation points

2023-09-27T03:38:06.8433333+00:00

Hi Subrothodas,

Thanks for sharing this. Is it possible to position the limit as a number of characters rather than a data limit? How does the JSON/XML format effect the number of characters that can be included in a push?

Hope to hear from you again.

Regards, Thomas
SnehaAgrawal-MSFT 22,706 Reputation points Moderator

2023-10-03T05:07:07.5166667+00:00

@Thomas Kelly Just checking if you have chance to see recent response.

Please let us know if further query or issue remains.
Thomas Kelly 25 Reputation points

2023-10-03T06:02:31.7733333+00:00

Thank you for this explanation, Sneha. I think this helps answer what was asked.
SnehaAgrawal-MSFT 22,706 Reputation points Moderator

2023-10-05T05:55:29.1466667+00:00

@Thomas Kelly Glad it helped.

Please let us know if further query or issue remains.

Please accept as "Yes" if the answer provided is useful , so that you can help others in the community looking for remediation for similar issues.

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Tech-Hyd-1989 5,816 Reputation points

2023-09-26T09:34:09.01+00:00

Hello Thomas Kelly

Yes, there is a character limit for push notifications sent by Azure Notification Hubs. The character limit is 4KB. This means that the entire push notification, including the title, message, and any custom data, must be less than 4KB in size.

The character limit is in place to ensure that push notifications are delivered reliably and efficiently. Push notifications are typically truncated if they exceed the character limit, which can lead to a poor user experience.

To avoid exceeding the character limit, you can use the following tips:

Keep the title and message of your push notifications concise.

Avoid using images or videos in your push notifications.

Use custom data to store additional information that is not essential to the push notification.

If you need to send a push notification that is larger than 4KB, you can use a third-party service such as Firebase Cloud Messaging or Amazon Simple Notification Service (SNS). These services offer more flexible character limits and other features.

Here are some additional things to keep in mind:

The character limit for push notifications varies depending on the platform. For example, the character limit for iOS push notifications is 256 bytes.

The character limit for push notifications also depends on the format of the push notification. For example, JSON push notifications have a smaller character limit than XML push notifications.

I hope this helps! Let me know if you have any other questions.
Thomas Kelly 25 Reputation points

2023-09-27T03:38:06.8433333+00:00

Hi Subrothodas,

Thanks for sharing this. Is it possible to position the limit as a number of characters rather than a data limit? How does the JSON/XML format effect the number of characters that can be included in a push?

Hope to hear from you again.

Regards, Thomas
SnehaAgrawal-MSFT 22,706 Reputation points Moderator

2023-10-03T05:07:07.5166667+00:00

@Thomas Kelly Just checking if you have chance to see recent response.

Please let us know if further query or issue remains.
Thomas Kelly 25 Reputation points

2023-10-03T06:02:31.7733333+00:00

Thank you for this explanation, Sneha. I think this helps answer what was asked.
SnehaAgrawal-MSFT 22,706 Reputation points Moderator

2023-10-05T05:55:29.1466667+00:00

@Thomas Kelly Glad it helped.

Please let us know if further query or issue remains.

Please accept as "Yes" if the answer provided is useful , so that you can help others in the community looking for remediation for similar issues.

Answer 1

@Thomas Kelly Thanks for reaching here!

Yes, you are correct. Azure Notification Hubs limits the size of each push notification to 4 KB.

This means that the number of characters you can send in a push notification will depend on the size of each character.

For example, if you are sending only ASCII characters, you can send up to 4,000 characters in a single push notification. However, if you are sending Unicode characters, which require more bytes to represent each character, you will be able to send fewer characters in a single push notification.

Also as its mentioned here- https://learn.microsoft.com/en-us/azure/notification-hubs/voip-apns#considerations

Notification Hubs limits APNS payloads to 4 KB, as documented by Apple. For VOIP notifications, Apple allows payloads up to 5 KB. Notification Hubs does not differentiate between standard and VOIP notifications; therefore, all notifications are limited to 4 KB. To send VOIP notifications, you must not exceed the 4-KB payload size limit.

Further Suggest you to refer to this link for creating the JSON payload

Documentation for payload size limit.

let us know.

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Is there a character limit on Azure Notification Hub push message size?

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