NewAnthropic is watermarking Claude’s text output from 2 August 2026.See which models carry it →

Clean Claude’s formatting, platform by platform

What survives a paste depends entirely on where you pasted it. Some editors keep the HTML that Claude’s class names ride in on; others throw it away and leave only the invisible characters. Pick yours.

These keep the markup

Claude’s class names survive here. This is the group that gets people caught.

These strip it

Markup does not survive, but zero-width characters, exotic spaces and smart punctuation still do.

Not sure what is in your text? Paste it into the free checker — it lists every artifact and where it sits. No account, nothing uploaded, unlimited.

Check my text →
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