Remove Claude’s formatting from Slack
Slack discards pasted HTML, so Claude's class names do not survive into a Slack message. What does survive is character-level: zero-width characters, exotic spaces, smart quotes and em dashes. Paste normally — then check for invisible characters before sending.
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 Slack keeps
- Slack converts pasted content into its own message format, so provider class names do not survive.
- Zero-width characters do survive, and they break Slack search: a message containing them may not match the words it appears to contain.
The fastest fix
Paste normally — then check for invisible characters before sending.
There is no markup to remove here, so the characters are the whole problem. Zero-width characters, non-breaking and exotic spaces and smart punctuation are text rather than formatting, which is why they survive a route that strips everything else.
How to check it worked
No source view exists, so check the text before sending. A useful signal afterwards: search for a distinctive phrase from the message — if it does not match, invisible characters are splitting the words.
