Claude Watermark

Claude Watermark helps writers, creators, and developers prepare Claude-assisted drafts for publication. Paste your text to inspect hidden Unicode, invisible copy-paste artifacts, and unsupported HTML that can travel from chat interfaces into your document.

The checker runs in your browser without an account and without uploading your text, and it returns deterministic findings with counts and positions—so you can see exactly where the artifacts appear. It looks for issues such as HTML class names containing “claude,” zero-width characters, byte-order marks, and exotic or non-breaking spaces, plus it flags stylistic signals (like curly quotes and em dashes) as contextual indicators rather than proof.

Cleaning and rewriting are separate steps. One-click cleaning removes the detectable artifacts so you can export cleaner copy. If you want deeper change, the rewrite pass varies sentence rhythm and phrasing to reduce statistical word-choice signals; this is the mechanism intended to address watermarking that lives in the text’s word patterns.

Checking is free and unlimited. Cleaning and rewriting use credits—buy them once as needed; credits never expire. For paid rewriting, the example “Document pass” is one-off pricing at $3 and includes 5,000 rewrite words.

Is Claude Watermark free to use?

Yes—checking is free, unlimited, and requires no account. The text stays in your browser during the check.

What does the checker actually remove or fix?

It detects and can clean artifacts that are hard evidence: HTML class names containing “claude,” zero-width/invisible Unicode, byte-order marks, non-breaking and exotic spaces, plus smart quotes and em dashes are also counted. Cleaning focuses on the detectable traces.

Will cleaning alone make my text pass an AI detector?

Copy-paste artifacts are the part that can be removed with confidence, but AI detectors are still probability-based. If you want to address word-choice watermark signals, the rewrite pass is the intended step.

How does the rewrite pass differ from cleaning?

Cleaning removes detectable artifacts from how the text was pasted. The rewrite pass resamples each sentence with different wording and sentence rhythm to change the word-choice pattern that statistical watermarking depends on.

How private is my text during checking?

Checking runs entirely in your browser, and your text is never uploaded or stored as part of the check.

What does it cost to rewrite?

Credits are used for cleaning and rewriting, bought when needed; credits never expire. The provided example is a $3 one-off Document pass that includes 5,000 rewrite words.