Post Length CheckerPaste one post and check it against typical character limits for X, Threads, Bluesky, Mastodon, LinkedIn, Instagram, Facebook and YouTube at once.
Social Post Preview
Most feeds show only the first part of a caption before “more”. This preview helps you check that the hook lands in the visible part. It is a generic layout — not a copy of any app — and the cut-off points are editable estimates.
Optional image
Approximate preview. Real apps truncate by lines and screen width too.
Runs entirely in your browser. Your input and files are not uploaded to any server.
How to use
- Write the caption and optionally add an image.
- Choose a platform preset or a custom cut-off.
- Make sure the key message appears before “…more”.
Examples
Instagram
About the first 125 characters appear before the caption is truncated.
LinkedIn
Roughly the first 210 characters (or 3 lines) appear before “…see more”.
Privacy
Runs entirely in your browser. Your input and files are not uploaded to any server. See the privacy policy for what is stored in your browser (favorites and history only). Privacy policy
Check it yourself: open your browser’s developer tools, select the Network tab and use the tool. Your file never appears in an upload request. Once this page is saved for offline use, you can also disconnect from the internet and keep working. Ads and anonymous visit statistics, when enabled, make their own requests, but they never receive your files or text.
Frequently asked questions
How accurate is the cut-off?
It is an estimate. Apps truncate by lines and screen width as well as characters, and they change the rules. Use it to keep your hook short, not as an exact measurement.
Is my image uploaded?
No. The image is shown from your device using a temporary local URL.
Related tools
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Twitter / X Card PreviewPreview a summary or large-image card for X (Twitter), check text and image guidance, and generate the twitter: meta tags.
Hashtag OrganizerPull hashtags out of any text, remove duplicates regardless of letter case, sort them, turn plain words into hashtags and copy a clean set.
Bio Character CounterWrite a profile bio and see characters used and remaining for typical platform limits.