Mastodon Character Limit: 500 Characters
Last updated July 2026
The Mastodon character limit is 500 characters per post. That puts it between Threads (500) and Instagram (2,200) among the major networks.
Note: 500 is the default; individual instances can configure higher limits.
Character limits across platforms
| Platform | Post limit | Native threading |
|---|---|---|
| X (Twitter) | 280 | Yes |
| Bluesky | 300 | Yes |
| Threads | 500 | Yes |
| Mastodon | 500 | Yes |
| 2,200 | No | |
| 3,000 | No | |
| 63,206 | No |
Compare in detail with Threads’s 500-character limit, Bluesky’s 300-character limit, and X (Twitter)’s 280-character limit, or see the full social media character limits comparison.
What happens when you exceed the limit
Mastodon supports native threads, so longer content isn't lost — it's continued in a connected reply. When your post runs past 500 characters, the right move is to split it at a sentence boundary and post the remainder as the next item in the thread, keeping each part under the limit.
Other Mastodon limits
| Field | Limit |
|---|---|
| Bio | 500 characters |
Cross-posting to Mastodon with Postwake
Postwake watches the platform you actually write on and replicates each post to Mastodon within seconds. When your source post is longer than Mastodon's 500-character limit, Postwake splits it into a native thread rather than truncating it. It's deterministic by design: no double-posts, no black-box AI, and if a platform rejects a post you get the exact error and a retryable action.
Frequently asked questions
What is the Mastodon character limit in 2026?
As of 2026, the Mastodon character limit is 500 characters per post.
Can I post longer than 500 characters on Mastodon?
Not in a single post, but Mastodon supports native threads, so you can continue past 500 characters by splitting the content across connected replies.
How does Mastodon compare to X (Twitter)?
Mastodon allows 500 characters per post versus 280 on X (Twitter) — Mastodon gives you 220 more characters per post.
How does Mastodon compare to Bluesky?
Mastodon allows 500 characters per post versus 300 on Bluesky — Mastodon gives you 200 more characters per post.
How does Mastodon compare to Threads?
Mastodon allows 500 characters per post versus 500 on Threads — both share the same per-post limit.
How does Postwake handle the Mastodon character limit when cross-posting?
Postwake watches your origin platform and replicates each post to Mastodon, automatically splitting it into a native thread when it exceeds 500 characters — deterministically, with no double-posts.
Post once. Reach everywhere.
Write on your favorite network and let Postwake replicate it to Mastodon and beyond — thread-splitting and platform limits handled automatically.