A zero-width space (U+200B) is completely invisible but very real: it breaks string comparisons, regex matches, JSON keys, and site search. If your code works when you retype a value but fails when you paste it, a zero-width character is the usual suspect.
Paste the offending text here and CopyCleanse shows every zero-width character with its code point, then strips them all — locally, in your browser, so pasting secrets or code is safe.
Free, no sign-up, nothing leaves your browser.
Frequently asked questions
Where do zero-width spaces come from?
Copying from rendered web pages, rich-text editors, messaging apps, and AI chat interfaces. Some sites also insert them deliberately to fingerprint copied text.
Why does my regex fail on pasted text?
Because 'hello' and 'hel\u200Blo' look identical but are different strings. Removing zero-width characters makes the text match what you see.
Is it safe to paste code or config here?
Yes — processing is 100% client-side. Nothing you paste leaves your machine.