01Add a signature in the Outlook app
Open Outlook and tap your profile icon
Tap Settings (gear icon)
Tap your email account
Tap Signature
Enter or paste your signature and save
02Signature images on Outlook mobile
Outlook mobile supports adding images from the photo library. Insert-from-OneDrive for signatures is rolling out per Microsoft Message Center updates; check your app version if hosted logos fail.
Complex HTML from desktop may not render on mobile. Keep a short plain-text mobile signature if needed.
03Desktop signature vs mobile
New Outlook roaming applies to Microsoft 365 mailboxes on desktop and web, not to the mobile app's separate Signature field. Build a full signature on desktop, then copy key lines for mobile.
FAQ
How do I add a signature in the Outlook app on iPhone?+−
Tap your profile › Settings › your account › Signature, then type or paste your signature. Save before you compose a new message.
Why doesn't my desktop Outlook signature show on mobile?+−
The Outlook mobile app uses its own signature setting. Roaming signatures apply between new Outlook and Outlook on the web for supported mailboxes, not automatically to the mobile text field.
Can I use HTML in the Outlook mobile signature?+−
Support is limited. Plain text and simple rich text work best. For a designed HTML signature, use desktop or web Outlook and keep mobile to name, title, and phone.
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