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* Add limit on inbox payload size

The 1MB limit is consistent with the limit we use when fetching remote resources

* Add limit to number of options from federated polls

* Add a limit to the number of federated profile fields

* Add limit on federated username length

* Add hard limits for federated display name and account bio

* Add hard limits for `alsoKnownAs` and `attributionDomains`

* Add hard limit on federated custom emoji shortcode

* Highlight most destructive limits and expand on their reasoning
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Claire 2026-01-20 15:14:45 +01:00 • committed by GitHub
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FEDERATION.md
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@ -48,3 +48,22 @@ Mastodon requires all `POST` requests to be signed, and MAY require `GET` reques
### Additional documentation
- [Mastodon documentation](https://docs.joinmastodon.org/)
## Size limits
Mastodon imposes a few hard limits on federated content.
These limits are intended to be very generous and way above what the Mastodon user experience is optimized for, so as to accomodate future changes and unusual or unforeseen usage patterns, while still providing some limits for performance reasons.
The following table attempts to summary those limits.
| Limited property | Size limit | Consequence of exceeding the limit |
| ------------------------------------------------------------- | ---------- | ---------------------------------- |
| Serialized JSON-LD | 1MB | **Activity is rejected/dropped** |
| Profile fields (actor `PropertyValue` attachments) name/value | 2047 | Field name/value is truncated |
| Number of profile fields (actor `PropertyValue` attachments) | 50 | Fields list is truncated |
| Poll options (number of `anyOf`/`oneOf` in a `Question`) | 500 | Items list is truncated |
| Account username (actor `preferredUsername`) length | 2048 | **Actor will be rejected** |
| Account display name (actor `name`) length | 2048 | Display name will be truncated |
| Account note (actor `summary`) length | 20kB | Account note will be truncated |
| Account `attributionDomains` | 256 | List will be truncated |
| Account aliases (actor `alsoKnownAs`) | 256 | List will be truncated |
| Custom emoji shortcode (`Emoji` `name`) | 2048 | Emoji will be rejected |