Going from Facebook to Threads is one of the sharpest compression challenges in cross-posting text content. Facebook gives you up to 63,206 characters — enough room for a long essay, a detailed product announcement, or a winding story told in full. Threads caps every post at 500 characters, hard. Even a modest Facebook post with context, a closing question, and a couple of hashtags can sit at 600 or 700 characters before you notice the problem. The highest-friction delta on this route is not format or aspect ratio — it is the demand to distil.
Beyond the character budget, the two platforms treat hashtags very differently. Facebook supports them but its culture is near-tagless; Threads adopted a single topic-tag model that replaced multi-hashtag behaviour entirely. A Facebook post that happens to carry one or two casual hashtags still needs a deliberate choice about which single tag (if any) travels to Threads. This guide covers how to compress cleanly, what to cut versus what to rewrite, and how to run both posts in parallel without duplicating effort.
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Everything that changes between the two composers, side by side.
| Spec | Facebook (from) | Threads (to) |
|---|---|---|
| Primary canvas | 1080 × 1350 px · 4:5 (post) | 1080 × 1350 px · 4:5 (post image) |
| Caption limit | 63,206 characters (feed truncates after a few lines with “See more”) | 500 characters |
| Video length | Long feed uploads supported (hours); Facebook Reels are far shorter — check the composer for your account’s cap | Up to 5 minutes |
| Hashtags | Supported but lightly used — one or two at most reads native on Facebook | One topic tag per post — Threads replaced multi-hashtag culture with a single tag |
| Caption compression | 63,206 characters — effectively unlimited for text content | 500 characters hard limit — rewrite, not trim |
| Hashtag convention | Supported but lightly used — one or two at most reads native on Facebook | One topic tag per post — Threads replaced multi-hashtag culture with a single tag |
| Reels vs feed video | Long feed uploads supported (hours); Facebook Reels are far shorter — check the composer for your account’s cap | Up to 5 minutes |
The good news
The fine print
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Tip 1
Write the Threads version first: the discipline of fitting your idea into 500 characters often produces a sharper hook than the original Facebook post — use it as the opening sentence on Facebook and expand from there, not the other way around.
Tip 2
Use the URL as your "read more": Threads followers expect brevity; if the full story lives on Facebook or a blog, a link in the Threads post is a natural and accepted way to point readers there without trying to compress everything.
Tip 3
Keep a private note of @mention mappings: because Facebook and Threads handles can differ within the Meta ecosystem, a short running list of "Facebook handle → Threads handle" for the accounts you tag most often saves manual verification on every cross-post.
FAQ
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Threads enforces a hard 500-character limit per post. A tight three-sentence Facebook update with a link and one hashtag will usually fit; anything with a full paragraph of context, a closing question, and a CTA typically will not. Plan to rewrite rather than trim — a distilled Threads post that stands on its own performs better than a cut-off version of a longer Facebook post.
Threads replaced multi-hashtag culture with a single topic tag per post. Facebook already discourages more than one or two tags in its near-tagless feed, so the practical gap is small — but it is still a choice: pick the single most relevant tag for the Threads post, or drop hashtags entirely. Adding more than one tag on Threads is outside the platform’s convention.
Both platforms are part of Meta’s ecosystem and share elements of the same identity graph, but a Facebook Page handle and a Threads username are not guaranteed to be identical. Verify any @mentions before publishing on Threads — a handle that resolves on Facebook may point to a different account, or no account at all, on Threads.
Treat Threads as a teaser, not a mirror. Identify the one sentence that best captures the idea, build a tight 500-character post around it, and drop a link to the full Facebook post or the original source. Threads audiences are accustomed to brevity followed by a link — trying to compress a 2,000-character Facebook post into 500 characters usually produces something that reads as truncated rather than crafted.
Compose once, customize the caption per network, and let SocialKit publish to Facebook, Threads, and 9 more platforms on schedule — no re-uploading, no copy-paste.
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