Add your signature to Outlook on the web

⏱ About 60 seconds · outlook.com, outlook.office.com (Microsoft 365)

In the OnceSig editor, click “Copy signature”.
Open outlook.com (or outlook.office.com), click the gear icon → “View all Outlook settings” if shown.
Go to “Mail” → “Compose and reply”.
Under “Email signature”, click “+ New signature” and name it.
Click into the editing box and paste with Ctrl+V (Cmd+V on Mac).
Click “Save”.
Below the editor, set it as default “For New Messages” and “For Replies/Forwards”.

Shared with new Outlook: web signatures are stored in your Microsoft account and appear in the new Outlook desktop app automatically (and vice versa).

Good to know

Paste, don't retype. The settings editor strips some formatting when you build a signature by hand — pasting OnceSig's pre-built rich text preserves the table layout that survives sending.
Multiple accounts: repeat for each mailbox; signatures are per-account.
Images: your photo/logo must be a public https URL (how OnceSig images work by default).

Don't have your signature yet?

Build one free — templates pre-tested against Outlook's sanitizer.

Open the OnceSig editor