Unicode Compatibility Checker
Paste any text to see what it is actually made of and where it is likely to cause problems.
The analysis runs entirely in your browser. Your text is not uploaded.
Paste some text to see what it is made of.
About this tool
This reports what the text contains: which scripts, how many mathematical alphanumeric characters, combining-mark density, zero-width characters, bidirectional controls, variation selectors and private-use code points. It gives a reasoned risk level with the evidence behind it. It cannot predict how a specific device will render the text, and it does not pretend to.
Common questions
- Can this tell me if my text will work on Instagram?
- No, and nothing can. It tells you what the text contains and which properties commonly cause problems, so you can make an informed judgement.
- What are zero-width characters and why are they flagged?
- Characters with no visible width. They have legitimate uses in some scripts, but are also used to evade moderation and to hide text, so platforms increasingly strip them.
- Is my text uploaded for analysis?
- No. The analysis runs entirely in your browser.