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Post Length Checker
Check your post against the limits of X, Threads, Bluesky, LinkedIn, Instagram, YouTube and more, and split long posts into threads.
Free, no uploads, no sign-up. Runs 100% in your browser.
How Post Length Checker works
Counting follows each platform's rules, like links counting as 23 on X and visible characters on Bluesky. Runs as you type.
Input: Text. Output: Text.
How to use Post Length Checker
- Write or paste your post.
- Tap a platform to see what is left and what shows before "more".
- Copy the thread if it is too long.
Tips
- Video tools encode on your device, so short clips finish much faster.
- Square and 4:5 sizes take the most space in feeds. 9:16 is for stories, reels and shorts.
Post Length Checker FAQ
- Are my files uploaded?
- No. This tool runs entirely in your browser tab. Files are read from your disk into memory and the result is generated locally.
- Is it free? Are there limits or watermarks?
- Free and open source (MIT). There are no file-size caps, daily quotas, accounts or watermarks.
- Does it work offline?
- Yes, once the page (and any engine it needs) has loaded, it keeps working without a connection thanks to the service worker cache.
Related tools
- Word Counter: Words, characters, sentences, reading time and keyword density.
- Carousel Maker: Make swipeable text carousels for LinkedIn and Instagram, and export them as PDF or PNG slides.
- Audiogram Maker: Turn a podcast or voice clip into a shareable video with a moving waveform, cover art and a title.
- Video Reframe (9:16, 1:1, 4:5): Turn a landscape video into a vertical short, a square or a 4:5 post with a blurred or solid background.