Threads Character Counter & Cross-Platform Validator
Validate your Meta Threads drafts against the 500 character limit and instantly check if they fit Bluesky's 300 grapheme limit, Twitter's 280, and Mastodon's 500 β all in one composer.
π Character Limits: All Four Platforms
Draft Composer
* URLs are wrapped to 23 symbols on Twitter/X
* Mastodon uses 500 graphemes; URLs are always counted as 23 symbols
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How Meta Threads Counts Characters
Key differences between Threads and the rest of the social media landscape
Meta Threads: 500 Characters
Unicode character counting
Threads counts standard Unicode characters β not graphemes like Bluesky. A family emoji π¨βπ©βπ§βπ¦ counts as multiple characters on Threads. URLs are written out in full, so long links can eat into your 500-character budget significantly.
Bluesky: 300 Graphemes
Grapheme + byte counting
Bluesky uses grapheme-based counting (via Intl.Segmenter), meaning π¨βπ©βπ§βπ¦ counts as exactly 1 character. However, a separate 3,000 UTF-8 byte limit means emoji-heavy posts can still be rejected even under 300 graphemes.
Cross-Posting Strategy
Write once, post everywhere
Write to Bluesky's 300-character limit and your post will fit every major platform's single-post format. The constraint is Bluesky's 300 graphemes β Threads' 500 gives you 200 characters of headroom if posting only there.
Threads vs Bluesky: Feature-by-Feature
| Feature | 𧡠Threads | π¦ Bluesky |
|---|---|---|
| Post limit | 500 Unicode chars | 300 graphemes |
| URL counting | Full URL length | Full URL length |
| Protocol | ActivityPub (Meta) | AT Protocol (open) |
| API access | Limited/Business only | Free public API |
| Custom domain handles | No | Yes (@yourname.com) |
| Data portability | Partial (ActivityPub) | Full (PDS portable) |
| Feed algorithm | Meta proprietary | Open feed generators |
| Quote posts | Yes | Yes |
| Threading | Native chains | Native chains |
Tips for Effective Cross-Posting: Threads & Bluesky
Write to the lowest common denominator: If you plan to post to Twitter/X, Bluesky, and Threads simultaneously, keep each post segment under 280 characters β the most restrictive limit. Your post will fit all four platforms with no editing needed.
Mind your URLs on both platforms: Neither Threads nor Bluesky wraps links (unlike Twitter). A long URL like https://example.com/very/long/path can cost 40β80 characters on both. Use link shorteners or append links as a reply post to preserve your character budget.
Leverage thread splitting for long-form: Both Threads and Bluesky support native thread chains. Use the thread splitter above to segment your long-form content into individual posts, then copy each sequentially into both apps.
Rewrite @mentions per platform: Threads uses @username (Instagram-style), while Bluesky requires @handle.bsky.social or a custom domain. Posts with mentions will need platform-specific edits before publishing.
Use the Mastodon row as a bonus check: The crossposting simulator includes Mastodon's 500-character limit. If your post passes all four β Bluesky (300), Twitter (280), Threads (500), Mastodon (500) β it works everywhere without any editing.