Zero width
Zero-width spaces and joiners
Characters with no width at all. They hide between letters and break search and word counts.
word⟨ZWSP⟩word→wordword
ChatGPT Watermark Remover - Find Hidden Characters
Paste ChatGPT text to find and remove invisible characters. Every removal is marked so you can see where they were. Free, no sign-up.
What it finds
The invisible characters people call a ChatGPT watermark
They look like nothing on screen but stay in the text when you copy it. The remover strips them out and keeps emoji and line breaks intact.
Odd spaces
Non-breaking and narrow spaces
Look like normal spaces but behave differently. Narrow no-break spaces show up in some AI output.
100⟨NNBSP⟩words→100 words
Formatting
Byte order marks and soft hyphens
Leftovers from editors and copy paste that can break forms, code and publishing tools.
⟨BOM⟩Title→Title
Direction
Direction marks
Invisible left-to-right and right-to-left controls that can scramble how text displays.
⟨LRM⟩text→text
It can
- Find and remove invisible characters in one click
- Mark every spot where something was removed
- Keep emoji, paragraphs and line breaks intact
- Work without an account. Your text never leaves your browser
It can't
- Change the wording that makes text sound like AI
- Make text pass an AI detector on its own
For the wording itself, the Lumi humanizer rewrites AI phrasing. You get 300 free words when you sign up.
ChatGPT Watermark Remover FAQ
What the so-called ChatGPT watermark is, and what removing it does.
Does ChatGPT add a hidden watermark to text?
There is no confirmed hidden watermark in ChatGPT text. Some outputs do contain invisible or unusual Unicode characters, such as narrow non-breaking spaces or zero-width spaces, and people often call those a watermark. This tool finds and removes them.
How do I see the hidden characters?
Paste your text and press Clean text. Every spot where an invisible character was removed is marked with a small dot, and hovering it shows which character it was.
Will removing hidden characters make my text undetectable?
No. AI detectors mainly judge word choice and sentence patterns, so removing invisible characters rarely changes a score. To change the wording itself, use a rewriting tool such as the Lumi humanizer.
Can hidden characters cause problems?
Yes. They can break word counts, search and replace, code, forms and some publishing tools, and they can make text look copied when someone inspects it.
Is my text uploaded anywhere?
No. Everything runs in your browser and nothing is sent to Lumi or anyone else.
Is it free?
Yes. It is free with no sign-up, for up to 50,000 characters per paste.
Still have questions? Visit our help center or read our blog guides.