Text cleanup guide · October 3, 2026

Claude Watermark Remover vs AI Detector: What Changes?

Direct answer: Claude Text Cleaner removes supported invisible Unicode characters and em dashes from text you paste into your browser. It reports those edits. It does not determine whether Claude wrote the text, remove Claude's embedded text watermark, or make writing undetectable by AI detectors.

Open the browser-only cleaner

Two different kinds of signal

Anthropic says its supported Claude models can embed a watermark in generated text, and that the watermark adds no hidden characters. Its help center explains which models support marking and notes that detection is a separate process. Removing a zero-width character cannot establish whether that embedded mark is present or absent.

What this site's report actually measures

When you paste text into the home page, the cleaner checks each Unicode code point locally. It removes supported zero-width characters, bidirectional controls, tag characters, variation selectors, private-use characters, soft hyphens, and em dashes. The report shows original length, clean length, removed characters, and changed categories. A zero in the report means no supported removable characters were found in that paste; it is not a detector verdict.

Here is a small example. The bracketed label below represents a character you would not see in ordinary text:

U+200B is a zero-width space. Removing it fixes a hidden character between two visible parts of a word. It does not change the draft's authorship or test a model-level watermark. The example illustrates the cleaner's code-point rule, not a claim that Claude inserts this character.

A practical cleanup workflow

1. Keep an untouched copy of the original draft so you can compare the result.
2. Open Claude Text Cleaner and paste text copied from Claude or another AI tool. No login or file upload is needed.
3. Click Clean Text if needed, then read the removed-character count and changed-category list.
4. Review the cleaned text before copying it into a document or publishing tool. This matters especially for emoji, right-to-left writing, special symbols, and em dashes, because removing some supported characters can change how text renders or reads.
5. Copy the result. Apply your normal fact-checking, attribution, and editorial rules separately.

The pasted text is cleaned in your browser. The tool does not send the text to a server for cleaning, save a history, or require an account. Its privacy page explains the scope.

Questions people often mix together