Why does Claude use so many em dashes?

Em dash frequency is a side-effect of Claude's training data and RLHF optimisation. Anthropic has not patched this, making it one of the most reliable single-feature signals for Claude-detection tools.

Can I choose whether em dashes are replaced or removed?

Yes. The Settings panel lets you replace em dashes with a regular hyphen-minus, remove them entirely, or leave them unchanged — whichever suits your style guide.

Does this work with Claude 3 Sonnet, Opus, and Haiku?

Yes. The cleaning targets character-level and punctuation signatures that are consistent across all Claude 3 model variants.

Will cleaning Claude text affect its meaning?

No. The cleaner only removes or normalises invisible characters and punctuation. Word choice, sentence structure, and paragraphing are untouched.

Is my Claude text sent to a server?

Never. Everything is processed inside your browser. We have no access to your content.

Free AI Text Cleaner

Claude AI Text Cleaner

Strip em dashes, non-standard punctuation, and invisible Unicode artifacts from Anthropic Claude outputs — privately, in your browser, in seconds.

Paste Your Text

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Supports text from ChatGPT, Claude, and other AI assistants

Your text is processed locally. We do not store your data.

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Supported: .txt, .docx, .pdf (max 10MB, up to 10 files)

Cleaning Settings

Original Text

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Cleaned Text

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Your text is processed locally. We do not store your data.

Anthropic's Claude has a distinctive writing style and embeds specific Unicode artefacts that make its output recognisable to AI detectors. This cleaner removes every known Claude-specific hidden character and normalises punctuation — so your text looks and reads like something a human wrote.

What Claude AI hides inside your text

Claude outputs carry several stylistic and technical fingerprints that can trigger AI-detection tools or cause formatting issues in editors and CMSs.

Excessive em dashes

U+2014

Claude uses em dashes (—) at a rate far above the human average, making them a statistically reliable detector signal. The cleaner replaces or removes them according to your settings.

Non-breaking spaces

U+00A0

Claude sometimes inserts non-breaking spaces before punctuation marks (a typographic convention from French), breaking word-wrap in English-language editors and email clients.

Curly / smart quotes

U+2018–U+201D

Straight ASCII quote marks are replaced with typographic Unicode variants. These can cause encoding errors when the text is pasted into databases, APIs, or plain-text fields.

Zero-width non-joiners

U+200C

Occasionally present in Claude exports, these invisible characters affect ligature rendering and are a known marker in some AI-detection signatures.

How to clean Claude AI text in 3 steps

1
Paste or upload
Paste your Claude output or upload a .txt, .docx, or .pdf export. Multiple files can be queued and processed as a batch.
2
Automatic detection
The engine identifies em dashes, non-breaking spaces, zero-width characters, curly quotes, and other Claude-specific artefacts — no manual configuration needed.
3
Review the diff & export
Every change is highlighted in the side-by-side diff view. Download the cleaned file or copy to clipboard when satisfied.

Before & after cleaning Claude AI text

Before — contains hidden markers

The results were — as expected — mixed. Claude’s summary was‌ thorough but occasionally verbose.

After — clean, standard Unicode

The results were - as expected - mixed. Claude's summary was thorough but occasionally verbose.

Frequently asked questions about Claude AI watermarks

Why does Claude use so many em dashes?: Em dash frequency is a side-effect of Claude's training data and RLHF optimisation. Anthropic has not patched this, making it one of the most reliable single-feature signals for Claude-detection tools.
Can I choose whether em dashes are replaced or removed?: Yes. The Settings panel lets you replace em dashes with a regular hyphen-minus, remove them entirely, or leave them unchanged — whichever suits your style guide.
Does this work with Claude 3 Sonnet, Opus, and Haiku?: Yes. The cleaning targets character-level and punctuation signatures that are consistent across all Claude 3 model variants.
Will cleaning Claude text affect its meaning?: No. The cleaner only removes or normalises invisible characters and punctuation. Word choice, sentence structure, and paragraphing are untouched.
Is my Claude text sent to a server?: Never. Everything is processed inside your browser. We have no access to your content.

Clean text from other AI tools

ChatGPT Remover

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Gemini Remover

Strip soft hyphens, Unicode tracking characters, and hidden artefacts from Google Gemini text.

Or return to the main watermark eraser to clean text from any AI tool.