What exactly does ClaudeWatermark remove from my text?

It removes every trace that is actually detectable in your text: the HTML class names Claude's web interface pastes into your document (the thing the AO3 detector looks for), zero-width and invisible Unicode characters, non-breaking and exotic spaces, smart quotes and em dashes. Then the rewrite pass varies the sentence rhythm and length that make prose read as machine-written.

Is ClaudeWatermark free to use?

Checking is free, unlimited and needs no account. It runs in your browser, so your text is never uploaded. Cleaning and rewriting cost credits, and you get 3 free on signup with no card. Credits never expire.

Will my text pass an AI detector after using the rewrite engine?

Detectors score how predictable your word choices are. The rewrite pass varies sentence length, rhythm and phrasing, which moves exactly the signal those tools measure. The copy-paste artifacts are the part that is hard evidence rather than a probability score, and those come out completely.

How does the AO3 Claude detector work?

It is a single CSS rule matching paragraphs whose class name contains 'claude' inside a work's body. That class is only there if the text was pasted straight from Claude without passing through another editor — which is why it catches people. Cleaning the HTML removes it completely.

Is my text private when I check or rewrite?

Checking runs entirely in your browser. The text is never uploaded, so there is nothing for us to store. The rewrite pass sends the passage to our model provider to process it, and we do not keep it afterwards or use it for training.

Which Claude models carry the statistical watermark?

Anthropic is rolling out an imperceptible statistical watermark for Claude models launched from 2 August 2026. Which models carry it changes as new ones ship, so we keep a live model-by-model table. Current listed models include Claude Opus 5, Claude Sonnet 5, Claude Fable 5, Claude Mythos 5, Claude Opus 4.8 and Claude Haiku 4.5.

What happens if a rewrite job fails? Do credits ever expire?

Failed jobs are refunded automatically — if the engine errors, your credits go back the same second, no need to ask. Credits never expire. Monthly credits stack instead of resetting, and top-ups never lapse. One credit covers 500 words, and a 20,000-word document is a single job.

Is ClaudeWatermark affiliated with Anthropic?

No. Claude Watermark is independent and not affiliated with, endorsed by, or connected to Anthropic, OpenAI, Google or Turnitin. It has no access to Anthropic's watermarking key and no private information about it. Everything published comes from Anthropic's public documentation, published research, or our own measurements.

Claude Watermark Checker – Free AI Text Trace Detector

ClaudeWatermark Overview

ClaudeWatermark is a free, open-source watermark and AI-trace detector built to find every trace Claude leaves in your text. Whether it is hidden HTML class names containing "claude," zero-width characters, byte-order marks, exotic spaces, or the stylistic signatures like em dashes and smart quotes, ClaudeWatermark surfaces them instantly in a single paste. The tool runs entirely in your browser for checking — nothing is uploaded, no account is required, and the service is unlimited.

How to use ClaudeWatermark

Paste your text into the checker on the homepage and the analysis runs instantly in your browser. Every finding comes back with a count and position in the text — facts about the bytes rather than a probability score you have to trust. Click one button to strip all detectable artifacts, then use the rewrite pass to resample the text through a different model, the one technique Anthropic's own documentation concedes a statistical watermark may not survive.

Core Features of ClaudeWatermark

Free unlimited checking: no account, no card, no upload — everything runs in your browser
Deterministic detection: HTML class names containing "claude," zero-width characters, byte-order marks, non-breaking and exotic spaces are either present or absent
One-click cleaning: strips all copy-paste artifacts from Claude chat output
AI rewrite engine: resamples each sentence through a different model to break statistical watermarks and vary sentence rhythm
Open source detection engine: verify exactly what the checker looks for
Editor-specific guides: fixes for AO3, Google Docs, WordPress, Notion, Substack, Medium, Gmail, Slack, and more
Live model table: which Claude models carry Anthropic's statistical watermark, updated as new models ship

Use Cases for ClaudeWatermark

Writers, editors, and content creators who use Claude for drafting can clean text before publishing — especially on platforms like AO3 where the Claude HTML detector skin flags content. Students preparing assignments, professionals composing emails in Gmail or Outlook, and teams working in Google Docs or Notion all benefit from removing invisible artifacts that survive copy-paste. The rewrite engine also helps anyone concerned about Anthropic's statistical watermark on text produced by Claude models launched from August 2, 2026.

Advantages of ClaudeWatermark

The tool is fiercely honest about what it can and cannot do. Unlike competitors that claim to detect Anthropic's statistical watermark, ClaudeWatermark states plainly that no one outside Anthropic has the key to verify it, making any such detection a guessing game. The detection engine is open source, the site is self-funded with no investors or affiliate links, and the conflict of interest is disclosed outright. Checking is free and unlimited, and the rewrite credits never expire.

Pricing and Plans

Checking and cleaning are completely free and unlimited. Rewriting consumes credits, with 3 free credits on signup (no card required). Monthly plans include Starter at $9/month (200 credits, 100,000 words), Pro at $19/month (600 credits, 300,000 words — most popular), and Max at $49/month (2,000 credits, 1,000,000 words). One-time credit packs are also available. One credit covers 500 words. Credits never expire, monthly credits stack instead of resetting, failed jobs are refunded automatically, and cancellation is one click from the dashboard with no email required.

ClaudeWatermark FAQ

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ClaudeWatermark Categories

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