What it does
GPTClean-up removes selected hidden Unicode characters, nonbreaking spaces and unwanted Markdown or HTML, with a code-point inspection table.
Paste plain text or HTML into GPTClean-up, choose the cleanup options and inspect the code points and changes before copying the result or downloading TXT. The limit is 500,000 UTF-16 characters per cleanup. Defaults remove selected zero-width or formatting characters and convert nonbreaking spaces, while preserving joiners and bidirectional controls unless you select their removal. Keep those language-sensitive defaults when the marks carry meaning in multilingual text or emoji. The site is free without signup and says processing is local with JavaScript enabled. Character cleanup does not certify authorship or a detector outcome.
Strengths
- Hidden-character inspection alongside cleanup
- Language-sensitive joiners are preserved by default
Best for
- Preparing copied text for plain-text reuse
Sources
- GPTClean-up — Free Text Cleaner & Hidden Character Checker (Oct 26, 2026)
- GPTClean-up: Free Text Cleaner & Hidden Character Checker (Oct 26, 2026)