Bluesky and Threads are both text-first feeds, but the direction from Bluesky to Threads is more forgiving than it first looks — you’re expanding from a tight 300-grapheme budget to Threads’ 500-character cap. The real friction lives elsewhere: Bluesky’s native link-card previews don’t carry over, @handle.bsky.social mentions are meaningless on Threads, and the hashtag philosophy is inverted — Bluesky lets you scatter plain-text tags across your 300 graphemes while Threads accepts exactly one topic tag per post.
The other shift is algorithmic. Bluesky’s custom-feed ecosystem rewards posts that spark conversation in interest-specific feeds, while Threads runs a Meta recommendation engine that weights early engagement differently. A post written for Bluesky’s plain-spoken, link-heavy style often needs a Threads-native reframe — tighter hook, one tag, and a standalone CTA that doesn’t assume readers will click a card.
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Everything that changes between the two composers, side by side.
| Spec | Bluesky (from) | Threads (to) |
|---|---|---|
| Primary canvas | 1200 × 675 px · 16:9 (post image) | 1080 × 1350 px · 4:5 (post image) |
| Caption limit | 300 graphemes (visual characters — emoji count once) | 500 characters |
| Video length | Short clips — Bluesky has been raising limits (around 3 minutes as of early 2026) | Up to 5 minutes |
| Hashtags | Plain-text hashtags count toward the 300-grapheme limit | One topic tag per post — Threads replaced multi-hashtag culture with a single tag |
| Link preview | Rich card embed generated automatically when a URL is pasted | No automatic card embed — URL appears as plain text in the caption |
| Hashtag convention | Plain-text hashtags count toward the 300-grapheme limit; multiple tags are normal | One topic tag per post — Threads replaced multi-hashtag culture with a single tag |
| @mention namespace | AT Protocol handles (@username.bsky.social) scoped to the Bluesky network | Instagram-linked accounts in a separate namespace — must be looked up and rewritten |
The good news
The fine print
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Tip 1
Treat the extra 200 characters as a gift, not padding: Threads’ 500-character cap gives you room to add a sentence that would have been cut on Bluesky — use it to sharpen the hook or add a standalone CTA rather than copying filler.
Tip 2
Front-load the substance: Threads’ algorithmic feed truncates long posts with a "more" tap, and the recommendation engine weights the first few lines heavily — put your best point first, even if the Bluesky original buried the lede.
Tip 3
Write the Threads tag last: choosing your single topic tag after you’ve written the full Threads caption prevents you from over-indexing on a tag keyword and makes the copy read more naturally.
FAQ
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Yes — on Bluesky, plain-text hashtags and @mentions count toward the 300-grapheme budget (visual characters, with emoji counting once). On Threads, the 500-character cap applies to the full post body, and the single topic tag is also included in that count.
Not automatically. Bluesky generates a rich preview card when a URL is pasted into its composer; Threads does not support the same format, so the URL appears as plain text. Add a descriptive sentence around the link to give readers the context the card was providing visually.
Threads replaced multi-hashtag culture with one topic tag per post — that is the current convention as of June 2026. On Bluesky, multiple plain-text hashtags are normal and drive discovery across custom feeds. When moving a Bluesky post to Threads, pick the single most relevant tag and drop the rest.
No. Bluesky handles are tied to the AT Protocol network and follow the @username.bsky.social format; they are scoped entirely to that network. Threads handles are linked to Instagram accounts and follow a different namespace entirely. Every @mention must be looked up on Threads individually and either rewritten with the correct handle or removed.
Compose once, customize the caption per network, and let SocialKit publish to Bluesky, Threads, and 9 more platforms on schedule — no re-uploading, no copy-paste.
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