GPT Watermark Remover — Clean Invisible Unicode from AI Output

Strip stray Unicode from generated text before it goes into your CMS, your spreadsheet or your repository.

Your text

Cleaned text

Hidden character report

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Where generated text picks up stray characters

Generated answers arrive through a rendering layer, and that layer leaves marks. Line-break hints become zero-width spaces. Emoji sequences get joined with invisible characters. Mixed-direction phrases pick up embedding controls. None of this is visible in the chat window, and all of it is visible to whatever you paste into next.

The second source is your own toolchain. Copying from a rendered page, then from a word processor, then into a web form, stacks up three different notions of what a space is. By the time the text reaches a database column, a single paragraph can contain four kinds of whitespace and none of them behave the same way.

The characters this tool strips

Six zero-width characters, twelve bidirectional controls, the soft hyphen, and the carriage return. Three invisible space variants are not deleted but normalised to an ordinary space, because deleting them would silently glue two words together. The full table is on the page, with a code point for each entry.

Formatting residue is handled separately and counted separately: runs of two or more spaces become one, and three or more consecutive line breaks become two. That is what fixes the doubled spacing people see after pasting a generated answer into an editor.

Cleaning generated text for a publishing workflow

Paste the draft, press Clean, and read the report before you copy. A long list of zero-width spaces usually means the text came straight from a chat window with no intermediate editing. A short list with one or two non-breaking spaces usually means it passed through a word processor.

The report is the useful part. It tells you which step of your own pipeline is introducing noise, which is something you can fix upstream instead of cleaning up afterwards forever.

A five-second check before you publish

Headlines are where invisible characters do the most damage. A non-breaking space inside a title will not wrap the way your layout expects, and a directional control can reorder the punctuation around it. Paste the headline alone and check the report before the full article.

For anything machine-read — CSV exports, search indexes, log matching — the same check applies. An invisible character is enough to make two strings that look identical compare as different, and that failure is expensive to debug after the fact.

Characters this tool looks for

25 invisible characters and formatting controls, with the action taken on each one.

Character	Code point	Action	What it does
Zero-width characters
Zero Width Space	U+200B	Removed	Invisible separator with no width. Commonly left behind when text is copied out of a chat window.
Zero Width Non-Joiner	U+200C	Removed	Invisible character that blocks two letters from joining in scripts such as Arabic or Devanagari.
Zero Width Joiner	U+200D	Removed	Invisible character used to glue emoji sequences together. Stray copies can break word wrapping.
Zero Width No-Break Space (BOM)	U+FEFF	Removed	Byte order mark. Harmless at the start of a file, invisible noise anywhere else.
Word Joiner	U+2060	Removed	Tells a text engine not to break a line here. Invisible, and easy to carry along by accident.
Mongolian Vowel Separator	U+180E	Removed	A legacy invisible separator from Mongolian script that now renders as nothing at all.
Bidirectional controls
Left-to-Right Mark	U+200E	Removed	Directional hint for mixed-script lines. Invisible on screen but present in the character stream.
Right-to-Left Mark	U+200F	Removed	Mirror of the left-to-right mark, used to steer the order of mixed-direction text.
Arabic Letter Mark	U+061C	Removed	Invisible directional marker for Arabic text. Rarely intentional outside its original document.
Left-to-Right Embedding	U+202A	Removed	Opens an embedded left-to-right run. Unpaired copies can scramble the order of a sentence.
Right-to-Left Embedding	U+202B	Removed	Opens an embedded right-to-left run. Left behind after copy-paste, it can flip nearby punctuation.
Pop Directional Formatting	U+202C	Removed	Closes an embedded directional run. Without its partner it is pure invisible noise.
Left-to-Right Override	U+202D	Removed	Forces following characters to display left-to-right regardless of their own direction.
Right-to-Left Override	U+202E	Removed	Forces following characters to display right-to-left. A common cause of text that looks reversed.
Left-to-Right Isolate	U+2066	Removed	Modern replacement for the embedding controls. Still invisible, still travels with copied text.
Right-to-Left Isolate	U+2067	Removed	Isolates a right-to-left run from the surrounding paragraph direction.
First Strong Isolate	U+2068	Removed	Isolates a run whose direction is decided by its first strong character.
Pop Directional Isolate	U+2069	Removed	Closes an isolate opened by one of the isolate controls above.
Formatting controls
Soft Hyphen	U+00AD	Removed	A hyphen the reader only sees if the word happens to break at the end of a line.
Carriage Return (CR)	U+000D	Removed	Half of a Windows line ending. Kept on its own it produces doubled spacing in most editors.
Markdown Asterisk Marker	U+002A	Removed	Bold or italic marker such as ** left behind when text is copied in its raw form. Turn this group off to keep Markdown styling marks.
Markdown Backtick Marker	U+0060	Removed	Inline-code backtick left behind after copying raw assistant output. Turn this group off to keep inline code marks.
Invisible spaces
No-Break Space	U+00A0	→ space	Looks exactly like a space but stops a line from breaking there. A frequent copy-paste leftover.
Figure Space	U+2007	→ space	A space as wide as a digit, used to align numbers in tables. Replaced with a normal space.
Narrow No-Break Space	U+202F	→ space	A thin, non-breaking space from French typography. Replaced with a normal space.

Frequently Asked Questions

▸Will this break my Markdown or code blocks?

No. Tabs, ordinary line breaks, indentation characters and all punctuation pass through untouched. The engine only acts on the characters in its published table, plus repeated spaces and blank lines. Zero-width characters inside code are removed, which is normally what you want.

▸Can I paste a whole article at once?

Yes. There is no fixed size limit. Very large inputs — a hundred thousand characters or more — are processed normally, with a short note in the report area to explain why it may take a moment longer. Everything still happens on your device.

▸Why do my line breaks look doubled after pasting?

That is almost always a carriage return. Windows line endings are two characters, and editors that only understand one of them render the leftover as an extra break. The engine removes the stray carriage return and leaves a single line feed, then collapses runs of three or more breaks down to two.