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UTF-8 Byte Viewer

See exactly how your text is encoded as UTF-8 bytes, and how many bytes it takes.

Processed in your browser

Your result will appear here as soon as you add some input.

How to use it

  1. 1Paste your text into the input box, or type it directly.
  2. 2Adjust the options if you need something other than the defaults.
  3. 3The result updates as you type - there is no button to press.
  4. 4Copy the result to your clipboard or download it as a file.

About the UTF-8 Byte Viewer

UTF-8 uses one byte for ASCII, two for most Latin and Cyrillic letters, three for CJK, and four for emoji and rarer scripts. The byte count, not the character count, is what a VARCHAR limit or a request size limit measures.

Questions people ask

Is your text uploaded to a server?

No. This tool runs entirely in your browser using standard web APIs, so your text never leaves your device. You can confirm it by opening your browser's network panel while the tool runs, or by disconnecting from the internet after the page has loaded.

Is it free, and do I need an account?

Yes, it is free, and there is no account, no sign-up and no watermark on the result. The project is funded by optional donations.