Remove Claude’s formatting from Substack
Substack preserves pasted HTML, so copying straight from Claude carries its class names — the ones containing “claude” — into a Substack post. They are invisible while you read, but present in the source and readable by anyone who looks. Paste into a plain-text editor first, then into Substack.
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 Substack keeps
- Substack's editor keeps some pasted formatting, and the published post is public HTML.
- Email versions are generated from the same source, so anything left in the post also ships to every subscriber's inbox.
The fastest fix
Paste into a plain-text editor first, then into Substack.
That handles the markup. It does not handle zero-width characters, non-breaking and exotic spaces, smart quotes or em dashes, which are text rather than formatting and survive every paste route on every platform.
