Mastodon
Mastodon character limit and media specs
| Post length | 500 characters (default; instances can raise it) |
| Images per post | 4 |
| Video size | 99 MB (default) |
| Poll options | 4 |
| Content warning | Counts toward the 500 |
Platform limits change — verify against the official docs before betting a campaign on one.
Good to know
Limits are per-instance — 500 is the mastodon.social default, but many servers allow more. Links count as 23 characters.
/ — over by
SawirPost's composer counts against each network's limit as you type — and when a draft runs over on Mastodon, it can split into a thread at word boundaries instead of getting cut off.