Only selected code points: zero-width spaces, BOMs, unusual spaces, direction controls, or other flagged characters. Every removal appears in the before-and-after view.
Selective Unicode cleaner
Claude Watermark Remover & Unicode Cleaner
Remove observable hidden characters from pasted text without silently normalizing or rewriting visible content. This independent tool does not claim to detect or erase Claude’s model-level watermark.
Analyze + Clean stay local Safe fixes selected in text mode No fake detection score
Free Claude text cleaner
Paste your text to check it instantly
Your text stays in this browser
We check for invisible characters and unusual spacing. Your words are not rewritten.
0 charactersInstant check
Formatting issues found
Safe to clean
Low-risk formatting changes only
- 0 hidden characters
- 0 unusual spaces
Needs your review
Left unchanged by safe clean
No formatting issues found
Your text is ready to copy. This check covers known Unicode and spacing artifacts.
Nothing safe to clean
Advanced details Code points and exact locations
Before / After
Review what changed
Only the items you selected were changed. Your sentences were not rewritten.
BeforeVisible markers added
AfterComplete cleaned text
FreeNo accountRuns locally in your browser
Removal boundary
Clean exact characters; treat statistical signals separately
Character cleanup is directly verifiable in the diff. Claude’s model-level watermark is a different mechanism, so this page does not turn Unicode removal into a claim about statistical detection.
A clean Unicode report does not mean a Claude statistical watermark is absent. Anthropic’s official detector and technical documentation are not yet public.
What a Claude watermark remover can remove exactly
This cleaner works on the observable layer: exact characters present in your pasted text. It identifies zero-width characters, byte order marks, unusual spaces, bidirectional controls, and other formatting code points with their line and column. You decide which types to remove, and the diff exposes every change.
Character cleaning is not statistical watermark removal
Anthropic says supported Claude models weave an imperceptible watermark into generated text at the model level. It can travel with copied text and may persist through editing. Removing hidden Unicode does not prove that this statistical signal is gone, because the two mechanisms are different.
When to use the remover, cleaner, or rewrite workflow
- Use the cleaner when you need to inspect clipboard artifacts, invisible formatting, or unexpected characters.
- Use the diff when rendering, parsing, accessibility, or publishing behavior matters.
- Treat rewriting separately because it changes visible content and may alter facts, tone, citations, or code behavior.
For the first-party technical boundary, read Anthropic’s current marking guidance.
Clear answers, narrow claims
Frequently asked questions
Can this tool remove Claude’s model-level watermark?
It can remove only the hidden Unicode and formatting artifacts you select. Anthropic describes its text watermark as model-level, and its technical detection mechanism is not public, so this tool cannot verify or guarantee removal of that statistical mark.
What does the Claude watermark cleaner remove?
It reports exact Unicode code points such as zero-width characters, byte order marks, unusual spaces, and direction controls. Nothing is removed until you select a character type and review the result.
Does cleaning change the visible text?
The cleaner does not normalize, paraphrase, or replace visible words. Some invisible characters can still affect layout, emoji, scripts, or source code, so review the diff before using the output.
Does paraphrasing guarantee watermark removal?
No. Anthropic says heavily edited, paraphrased, translated, or mixed text may lack a detectable mark. That is a stated detection limitation, not a guarantee for any particular rewrite.