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
Your files and text stay in your browser while you use this tool, and ads or anonymous visit statistics do not receive them. Only your favorites and recent tools are saved on your device. Privacy policy
Want proof? Check it with your browser’s Network tab: How to check that a tool does not upload your files
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.
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