This checks a single piece of writing against the length limits of several major platforms at once, so you can see right away whether a caption fits as is, needs trimming for one specific platform, or is well within range everywhere. Paste your text once and get a live progress bar for each platform's limit.
How to use it
- Paste or type your post into the box.
- Watch the progress bars for each platform update live as you type.
- Look for any bar that turns red, meaning that platform's limit is exceeded.
- Trim your text if it needs to fit a specific platform.
- Copy your finalized text once it fits everywhere you plan to post it.
When it helps
- Writing one caption meant for several platforms and checking it fits everywhere first.
- Making sure a post won't get silently cut off or rejected for going over a limit.
- Comparing how much room is left across platforms while drafting a longer update.
- Learning the actual current limits of different platforms, which change occasionally.
- Trimming a caption efficiently by seeing exactly how far over a specific limit it is.
Good to know
- Write for the strictest limit first if you want one caption that works everywhere without platform specific edits.
- Some platforms count a link as a fixed number of characters no matter how long it actually is, so treat these limits as a close guide rather than an exact guarantee.
- Keep a shorter version ready for tight limit platforms and a longer one for generous ones.
- When a caption is close to a platform's limit, trim filler words and adjectives first. They're usually the easiest length to cut without losing the actual message.
- If you regularly post to the same two or three platforms, bookmark this tool so checking length becomes part of your normal posting routine rather than an extra step you skip.
Questions
Are these limits always accurate?
They reflect each platform's commonly published limit at the time this tool was built. Platforms do change their limits occasionally, so check current official guidance if you're right at the edge for something important.
Do links or mentions count differently toward the limit?
Some platforms have special counting rules for links. This tool counts your raw text length, so results involving links may differ slightly from what the platform actually counts.
Can I check just one platform instead of all of them?
It shows every platform at once so you can compare, but you can just focus on the one bar that matters and ignore the rest.
Why does Threads have a shorter limit than Instagram, from the same company?
Each platform sets its own limit independently based on its own product decisions, even when platforms share a parent company or are closely integrated.
Does emoji or non English text count differently toward these limits?
Some platforms internally count certain emoji or non Latin characters as more than one character, so real behavior can vary slightly from a simple count for that kind of text.
Do direct messages have the same limits as public posts?
Not always. Some platforms apply a different limit to private messages than to public posts, so it's worth checking separately if you're writing a long direct message.