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Social Media Post Previewer

A Social Media Post Previewer shows your draft post styled like the actual social platform with the platform-specific truncation point marked, so you can see exactly where readers will hit "Show more" before they click — rendered entirely in your browser.

Draft
X (Twitter)0 / 280

Hard 280-grapheme limit; links flat-count as 23 chars.

ou
offlineutils
@offlineutils · now
Your post preview will appear here.

About Social Media Post Previewer

Type a post on the left and the right side mirrors how the same text renders on X (formerly Twitter), LinkedIn, Bluesky, Threads, and YouTube descriptions, complete with the platform's character limit and the precise position where each cuts the preview. Switch platforms with a tab. Includes per-platform character counts, hashtag and link detection, and grapheme-cluster-aware counting so emoji and CJK characters are tallied the same way the real platforms count them.

What Social Media Post Previewer does

  • Live preview for X, LinkedIn, Bluesky, Threads, and YouTube descriptions
  • Platform-accurate truncation markers ('Show more' / '…more')
  • Grapheme-cluster character counting (emoji and CJK count correctly)
  • X-style 23-character link counting where applicable
  • Hashtag and link detection per platform rules

When to reach for Social Media Post Previewer

  • Drafting a post that hooks readers before the 'Show more' cut
  • Verifying a multi-platform announcement fits every limit
  • Checking how an emoji-heavy tweet actually counts on X
  • Auditing whether a YouTube description's first 120 characters carry the hook

How to use Social Media Post Previewer

  1. 01

    Draft your post

    Type into the editor on the left.

  2. 02

    Pick a platform

    Switch tabs to see X, LinkedIn, Bluesky, Threads, or YouTube.

  3. 03

    Check the truncation marker

    The preview shows exactly where the platform will cut your post with 'Show more'.

When to use Social Media Post Previewer vs alternatives

AlternativeUse Social Media Post Previewer when…Use the alternative when…
Pasting into each platform's compose boxyou want to see every platform side-by-side without context-switching.you are about to publish and want the live editor.
buffer.com / hootsuite.com previewyou want a free, no-signup, offline preview.you also need scheduling and publishing.

Frequently asked questions

Why does my character count differ from another tool?
Many tools count UTF-16 code units, which double-counts emoji and many non-Latin characters. We use Intl.Segmenter to count grapheme clusters, matching how X, LinkedIn, and Bluesky display their counters.
Where does each platform truncate?
X shows the first ~280 characters before "Show more"; LinkedIn truncates feed posts at ~210 characters before "…more"; Bluesky's limit is 300 graphemes and shows the full post inline; YouTube descriptions truncate at ~120 characters in the preview row. Limits are kept under per-platform constants we update over time.
Does it count links the way each platform does?
X counts links as 23 characters regardless of length; LinkedIn counts the full URL. We mirror each platform's rule per the active preset.

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