Understand how Anthropic marks AI text at generation time, strip copy-paste formatting residue in your browser, and reconstruct wording with clean syntax.
See it in action
Inspect invisible Unicode characters and syntax markers that commonly appear when copying text from Claude chats.
Sure! Here’s a summary — **Key points** - First item > Note: important
Sure! Here's a summary — Key points • First item Note: important
Why
Understand how Anthropic marks AI text at generation time, strip copy-paste formatting residue in your browser, and reconstruct wording with clean syntax.
When copying text from web chat interfaces, markdown blocks, or mobile apps, the clipboard often captures non-standard whitespace (such as U+202F narrow no-break spaces), soft hyphens, zero-width joiners, and broken formatting. Our free browser tool inspects and removes 60 invisible Unicode variants instantly on your device.
The watermark applied by Claude is mathematical token distribution governed by Anthropic's private key. Removing physical Unicode characters does not alter this statistical distribution. To alter the statistical pattern, the entire passage must be systematically reconstructed with new vocabulary and sentence flow.
Invisible-character and Markdown cleaning run locally in your browser. We don’t store Free-tool text.
How
Paste your draft into the scanner. The client-side parser checks for 60 hidden Unicode markers, cleans trailing delimiters, standardizes spaces like U+202F, and exports sanitized plain text.
For deep revision, use the paraphrase engine to regenerate sentence structures from the ground up, replacing formulaic phrasing while preserving intended facts and domain terminology.
Read through the revised output to ensure natural cadence, correct technical terminology, and contextual accuracy before final publication or delivery.
Features
Detects zero-width spaces, NNBSP, BOM, directional marks and 60+ other invisible code points without rewriting your words.
Strip headings, lists, quotes, and emphasis markers into plain text ready for CMS and editorial review.
Pro rewrite regenerates meaning-preserving text when a watermark is baked into wording — not just hidden Unicode.
Rewrite AI flavor into more natural cadence. No tool can guarantee detector bypass; results vary.
Definition
According to Anthropic's public disclosure, Claude text watermarking does not append hidden bytes, zero-width characters, or cryptographic metadata to exported text. Instead, generation relies on a pseudorandom cryptographic key that slightly biases token selection probability during generation, embedding an imperceptible statistical signature into word choice.
Because the watermark is embedded directly into the statistical distribution of words, light surface edits like swapping occasional synonyms or fixing punctuation generally leave the signature intact. However, a comprehensive rewrite that changes nearly every word and reorganizes sentence structure can drop the statistical trace.
The statistical watermark behaves differently across content types. It is strongest on long-form analytical and creative prose, but weak or undetectable on short snippets, source code, highly constrained technical formulas, and light proofreading of human-authored drafts. Translating watermarked text into another language can still carry the underlying statistical signal.
Anthropic's official verification API is not public, and third-party tools cannot access Anthropic's private key. Our platform operates independently: we provide instant browser-side paste hygiene and optional restructuring tools, without claiming access to Anthropic's internal verification system.
Sources
Hidden Unicode, Markdown residue, and Claude’s official statistical watermark are three mechanisms. This page cites the public specs; it does not claim detector bypass.
| Mechanism | What it is | What this site does |
|---|---|---|
| Invisible Unicode | Zero-width and format code points (including U+200B and U+202F) that can ride along in a paste. | Free local scan and delete. Does not rewrite sentences. |
| Markdown / rich-text residue | Hashes, fences, emphasis markers, and copied rich-text spacing. | Free local strip to plain text. |
| Statistical wording watermark | A sampling pattern in word choice. Official Claude text watermarks add no hidden characters. | Pro meaning-preserving rewrite. Not a detector score, not a guarantee. |
“Nothing is added to the text and there are no hidden characters.”
“U+200B ZERO WIDTH SPACE is intended for line break control without displaying a visible space.”
Markdown tokens follow the CommonMark specification: CommonMark spec.
Use cases
Sanitize drafts before WordPress, Webflow, or a headless CMS — without dragging invisible characters into meta fields.
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Turn chatty AI Markdown into clean plain text for writers, fact-checkers, and style guides.
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Ship client-ready copy faster: remove paste residue locally, then upgrade only when you need rewrite-based cleaning.
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Normalize assistant output before docs, changelogs, and internal knowledge bases — with transparent detections.
Open the tool →Testimonials
“The free scan lists the code points. I clean the paste in the browser, then only use Pro if the wording itself needs a rewrite.”
Content ops
SEO & CMS
“Markdown from chat was breaking our editor. Stripping hashes and fences locally is the whole job — no file upload.”
Editorial
Publishing
“Hidden Unicode broke string equality in a parser. Character cleanup first; sentence rewrite is a different layer.”
Engineering
Docs & support
Tools
Dedicated landing pages for the searches people actually type.
Inspect and strip U+202F narrow no-break spaces, invisible Unicode residue, and Markdown artifacts from ChatGPT pastes locally, or use Pro rewrite for wording-level adjustments.
ChatGPT guide →Identify and remove hidden Unicode artifacts, clean up Markdown paste residue, and restructure Gemini draft text with transparent, browser-based inspection.
Gemini guide →Paste the text into Text Watermark Remover. Free tools stay in your browser; Pro rewrite regenerates wording.
Read morePricing
Unicode and markdown cleanup is always free in your browser, while Pro rewrite credits are available on our pricing page.
See pricingWe do not guarantee that paraphrased text will pass proprietary AI detectors such as Turnitin, GPTZero, or Copyleaks, nor do we promise total removal of Anthropic's proprietary statistical watermark. We do not support academic dishonesty or deceptive misuse.
FAQ
Claude's official watermark is a statistical bias in word choice created during generation using Anthropic's private key; it contains no hidden characters. Paste residue consists of invisible Unicode characters (like U+202F or zero-width spaces) and formatting artifacts copied from web chat interfaces. Our free scanner cleans paste residue, but not statistical bias.
The in-browser scanner that detects and removes 60 invisible Unicode code points, standardizes non-standard whitespace, and strips Markdown debris is 100% free. Deep sentence restructuring and meaning-preserving paraphrasing require paid reconstruction credits.
No. The Unicode hygiene scan and formatting cleanup run entirely inside your browser's local JavaScript environment. Your text never leaves your device unless you explicitly submit it to the optional cloud paraphrasing engine.
No. Third-party detectors use heuristic classifiers and perplexity metrics that frequently produce false positives and unpredictable scores. We make no claim of bypassing any commercial or academic AI detection software.
Avoid automated paraphrasing on source code, strict mathematical equations, legal contracts, and short factual statements. In these cases, automated paraphrasing can introduce logic bugs or distort precision. Edit those sections manually instead.
No. Anthropic has not released its cryptographic verification API to the public. Only Anthropic's internal service can evaluate the statistical sampling mark. Our detector only reports observable Unicode artifacts and formatting anomalies.
About us
Anthropic's official verification API is not public, and third-party tools cannot access Anthropic's private key. Our platform operates independently: we provide instant browser-side paste hygiene and optional restructuring tools, without claiming access to Anthropic's internal verification system.
Understand how Anthropic marks AI text at generation time, strip copy-paste formatting residue in your browser, and reconstruct wording with clean syntax.