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

Remove Claude’s formatting from Canvas

Canvas preserves pasted HTML, so copying straight from Claude carries its class names — the ones containing “claude” — into a Canvas assignment submission. They are invisible while you read, but present in the source and readable by anyone who looks. Use the HTML editor toggle in the Rich Content Editor and remove the class attributes, or submit a file instead.

Check yours first. Paste the text into the free checker and it lists every artifact with its exact position — no account, nothing uploaded, unlimited.

Check my text →

What Canvas keeps

The fastest fix

Use the HTML editor toggle in the Rich Content Editor and remove the class attributes, or submit a file instead.

That handles the markup. It does not handle zero-width characters, non-breaking and exotic spaces, smart quotes or em dashes — those are text rather than formatting, so they survive the paste route above and every other one.

How to check it worked

Use the </> HTML editor toggle in the Rich Content Editor before submitting. Once submitted you usually cannot revise it, so check first.

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