The iPhone Mail app has no HTML signature field. The workaround is to email your signature to yourself, copy it, paste it into Settings, then use a neat “shake to undo” trick to fix the sizing. The same steps work on iPad.
1Get your signature into an email
- Design your signature in Mirosign and install it in a desktop app first (Apple Mail, Outlook for Mac, new Outlook or Thunderbird).
- Send yourself an email so it contains your signature.
2Copy the signature
Open the email in the Mail app on your iPhone. Press and hold on a plain piece of the signature text (not a link), tap Select All, then Copy.
3Paste into Mail settings
Open the Settings app, go to Apps → Mail → Signature (on older iOS: Settings → Mail → Signature). Choose All Accounts or Per Account, then press and hold to Paste.
4Shake to fix the sizing
The signature will first look oversized or slightly mangled. As odd as it sounds — shake your phone. A box appears saying Undo Change Attributes; tap Undo and the signature snaps back to the correct size. Create a new email to check it.