How do I detect a Claude watermark?

Paste your text and click Scan. The tool highlights every invisible or unusual character in yellow and lists its name, Unicode code point, and count, so you can see exactly what the text contains before anything changes.

How do I remove a Claude watermark from text?

After scanning, click Clean. The tool removes supported hidden characters such as zero-width and invisible formatting marks while leaving your visible text and formatting untouched. You can undo the change or restore the original at any time.

Does the tool preserve formatting?

Yes. Cleaning works at the character level inside a rich-text editor, so bold, italics, headings, links, and line breaks are preserved. In DOCX, XLSX, and PPTX files only the text content is changed and the document structure stays intact.

Can Claude Watermark Remover replace em dashes?

Yes, optionally. Turn the dash option on to convert em dashes and their longer variants to hyphens, or to remove them with sensible spacing. The en dash used in ranges is left unchanged.

Is Claude Watermark Remover free?

Yes. Text detection and cleaning are free, with a daily usage limit on the free plan. Paid plans add file and ZIP processing for DOCX, XLSX, and PPTX.

Can I upload DOCX, XLSX, or PPTX files?

File upload is a paid feature. On a paid plan you can upload single documents or many at once, clean them with formatting preserved, and download the results separately or bundled into one ZIP.

Does removing hidden characters prove a text was written by a human?

No. Detecting or removing hidden characters does not prove authorship. Invisible characters come from many sources, including copy-paste and editors, so a clean result only means the supported hidden characters are gone.

Can this tool check for the Claude watermark?

Not yet. Anthropic confirmed the watermark in August 2026 and announced an official detection API, with details still being finalized. We are preparing an opt-in check built on that API - unlike the rest of this page, it will send your text to the API and will be clearly labeled as doing so. Until then, the scanner reports hidden characters only.

Claude Watermark Remover

Daily limit 0/5
Plan name Free

Your text

Formatting is preserved. Your text is processed in your browser and never sent to our servers. Your text is also kept in this browser so a reload does not lose it. Use Clear to remove it.

Replace special spaces (non-breaking, narrow, etc.) with normal spaces

Replace long dashes (—) with hyphens (-)

Replace sentence-joining semicolons with full stops

Text cleanliness

Cleanliness refers to characters and typography, not to who wrote the text.

Gentle AI rewrite

Rewrites the wording to reduce typical AI patterns while keeping the meaning, tone and formatting. This feature sends your text to an AI model through our server. Nothing else ever leaves your browser.

Rewrite strength

Detected characters

Char	Character name	Unicode	Occurrences	Category

Claude Watermark Remover is a free online tool that finds and removes hidden Unicode characters in text - with an honest note: the Claude watermark Anthropic confirmed in August 2026 is statistical, not character-based, so this page explains exactly what character cleaning can and cannot do.

What does Claude Watermark Remover do?

Claude Watermark Remover scans text for invisible and unusual Unicode characters that show up in AI-generated, copied, or formatted content. Instead of deleting blindly, it highlights what it found and shows you the evidence before anything changes.

You can detect characters associated with a Claude watermark, remove unwanted hidden characters, clean zero-width characters, and optionally replace long dashes with plain hyphens.

Detecting hidden characters in text

Paste any text and every character is inspected. Invisible marks such as zero-width spaces, word joiners, and the byte order mark are highlighted in yellow so you can see exactly where they live. Each detected character comes with its name, its Unicode code point, and how many times it appears.

Removing watermark-related characters

Once you have reviewed the report, one click removes the supported hidden characters. The tool deletes invisible formatting marks that serve no visible purpose, leaving your readable text exactly as it was.

Keeping your formatting intact

Cleaning happens character by character inside a rich-text editor. Bold, italics, headings, links, and line breaks stay untouched. You are removing hidden characters, not reformatting the document.

Replacing long dashes

AI-assisted writing leans hard on the em dash. If you prefer plain punctuation, switch the option on and the tool converts em dashes and their longer variants to hyphens, or removes them while keeping sensible spacing. The en dash, which is correct in ranges like 2020–2024, is left alone.

Why use Claude Watermark Remover?

Most quick cleaners strip everything they find and hope for the best. That approach breaks emoji, damages non-Latin scripts, and tells you nothing about what changed. Claude Watermark Remover is built around transparency and safety: it shows the evidence, explains every character, and treats context-dependent marks with care.

Key capabilities include zero-width detection, clear highlighting, a full character report, formatting preservation, optional dash replacement, undo and restore, and copying with or without formatting. The tool detects and removes supported hidden characters associated with text marking and Unicode formatting.

Common use cases

These are the everyday situations where the tool earns its keep:

Cleaning text pasted from AI assistants, chat windows, or PDFs before publishing.
Checking whether a document contains invisible Unicode characters at all.
Removing zero-width characters that break search, sorting, or code.
Normalizing punctuation by converting long dashes to hyphens.
Preparing clean, portable text for a CMS, email, or code editor.

Claude Watermark Remover vs. basic text cleaners

The difference shows up in the details. A basic cleaner is a blunt instrument. A good watermark remover is a scalpel.

Feature	Claude Watermark Remover	Basic cleaners
Detect hidden Unicode	✅	✅
Show exact hidden characters	✅	Often no
Yellow character highlighting	✅	Often no
Preserve rich formatting	✅	Often no
Safe contextual Unicode handling	✅	Often no
Replace em dash optionally	✅	Varies
Local browser processing	✅	Varies
DOCX/XLSX/PPTX processing	Paid	Rarely
Entire ZIP processing	Paid	Rarely

Tips and best practices

Scan first, clean second. The report is there to be read: it tells you whether the hidden characters are harmless spacing marks or something worth a second look. Leave the dash option off unless you actually want to change punctuation, because dashes are visible content rather than hidden markers. If a result surprises you, undo the change or restore the original. With non-Latin scripts and emoji, trust the tool to keep context-dependent marks in place.

What the tool can and cannot detect

It is worth being honest about what a hidden character really tells you. The tool reliably finds invisible and unusual Unicode characters: zero-width spaces and joiners, non-breaking and narrow spaces, the byte order mark, soft hyphens, bidirectional controls, variation selectors, tag characters, and control codes.

What it cannot do is prove authorship. Detecting a hidden character does not by itself prove a text was generated by Claude. Invisible characters arrive from many sources: copy and paste, word processors, web editors, keyboard layouts, and other software. In August 2026 Anthropic confirmed that Claude text carries a SynthID-style statistical watermark - a pattern woven into word choice, with, in Anthropic's own words, nothing added to the text and no hidden characters - so no character cleaner can detect or remove it. Treat this tool as a hidden-character detector and cleaner, not an AI-authorship test.

How to remove a Claude watermark from text

Paste your text into Claude Watermark Remover.
Click Scan to detect hidden and unusual characters.
Review the characters highlighted in yellow.
Decide whether to replace long dashes.
Click Clean to remove the supported hidden characters.
Copy the cleaned text with formatting preserved.

Removing watermarks from files and ZIP archives

Paid plans add file support for people who work with documents rather than snippets. Open the Files and ZIP tab, then upload one or more files, or a whole archive:

Open Files and ZIP.
Upload one or more files, or a ZIP archive.
Scan the files.
Review the report.
Click Clean all.
Download the cleaned file or ZIP archive.

Supported formats are TXT, MD, CSV, JSON, XML, HTML, DOCX, XLSX, and PPTX. Inside a ZIP, the tool cleans the supported files, keeps the folder structure and file names, leaves unsupported files untouched, and hands you back a single cleaned archive. Formatting in Office documents is preserved because only text content is modified.

Privacy and security

Your text stays in your browser

Privacy is the main reason to use this tool. Text analysis runs locally. Cleaning runs locally. Pasted content is never sent to our servers, and documents are processed in your browser as well. The only request to the backend is a small check of your plan and daily limit, which carries no text, no HTML, and no document content. Analytics never include the content you clean.

FAQ

What is a Claude text watermark?

It refers to hidden characters or subtle formatting that could act as a marker inside text - in practice, almost always invisible Unicode characters such as zero-width spaces. In August 2026 Anthropic confirmed that Claude text carries a SynthID-style statistical watermark - a pattern woven into word choice, with, in Anthropic's own words, nothing added to the text and no hidden characters - so no character cleaner can detect or remove it. Treat this tool as a hidden-character detector and cleaner, not an AI-authorship test.
How do I detect a Claude watermark?

Paste your text and click Scan. The tool highlights every invisible or unusual character in yellow and lists its name, Unicode code point, and count, so you can see exactly what the text contains before anything changes.
How do I remove a Claude watermark from text?

After scanning, click Clean. The tool removes supported hidden characters such as zero-width and invisible formatting marks while leaving your visible text and formatting untouched. You can undo the change or restore the original at any time.
Does the tool preserve formatting?

Yes. Cleaning works at the character level inside a rich-text editor, so bold, italics, headings, links, and line breaks are preserved. In DOCX, XLSX, and PPTX files only the text content is changed and the document structure stays intact.
Can Claude Watermark Remover replace em dashes?

Yes, optionally. Turn the dash option on to convert em dashes and their longer variants to hyphens, or to remove them with sensible spacing. The en dash used in ranges is left unchanged.
Is Claude Watermark Remover free?

Yes. Text detection and cleaning are free, with a daily usage limit on the free plan. Paid plans add file and ZIP processing for DOCX, XLSX, and PPTX.
Can I upload DOCX, XLSX, or PPTX files?

File upload is a paid feature. On a paid plan you can upload single documents or many at once, clean them with formatting preserved, and download the results separately or bundled into one ZIP.
Does removing hidden characters prove a text was written by a human?

No. Detecting or removing hidden characters does not prove authorship. Invisible characters come from many sources, including copy-paste and editors, so a clean result only means the supported hidden characters are gone.
Can this tool check for the Claude watermark?

Not yet. Anthropic confirmed the watermark in August 2026 and announced an official detection API, with details still being finalized. We are preparing an opt-in check built on that API - unlike the rest of this page, it will send your text to the API and will be clearly labeled as doing so. Until then, the scanner reports hidden characters only.