Remove Claude’s formatting from Outlook
Outlook preserves pasted HTML, so copying straight from Claude carries its class names — the ones containing “claude” — into an Outlook email. They are invisible while you read, but present in the source and readable by anyone who looks. Paste with Ctrl+Shift+V, or use Home → Paste → Keep Text Only.
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 Outlook keeps
- Outlook composes in HTML by default, so a normal paste carries Claude's class names into the sent message.
- Every recipient can view the message source, and in a corporate tenant so can anyone with mailbox access or eDiscovery.
- Outlook also applies its own AutoCorrect, producing smart quotes and em dashes in text you typed yourself.
The fastest fix
Paste with Ctrl+Shift+V, or use Home → Paste → Keep Text Only.
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
Send the message to yourself and inspect the received copy's source. In a corporate tenant, assume anything you send is also readable through compliance tooling.
