How to install your email signature on iPhone Mail
iPhone's Mail app can keep rich formatting in its signature field, but it sometimes reapplies its own default style right after you paste. If that happens, shake your iPhone to trigger Undo, which reverts Mail's override and keeps your original formatting. It is an odd trick, but it works.
Do not have a signature to install yet? Build one free, no signup.
Open the generatorCopy your signature on your iPhone
Open your personal signature link in Safari on your iPhone and tap Copy signature.
Open iOS Mail settings
Go to Settings, Mail, Signature.
Choose Per Account if you use more than one inbox
Tap Per Account so each account can have its own signature. Otherwise, one signature applies everywhere.
Paste into the signature box
Tap into the signature field, then tap Paste. If the text suddenly changes size or font right after pasting, that is Mail overriding your formatting.
Shake to undo if formatting changes
Immediately shake your iPhone, tap Undo Paste on the prompt that appears, then paste again. The second paste usually keeps the original formatting.
Confirm it stuck
Tap out of the field, then open Mail and start a new message to check the signature looks right before sending anything.
Common questions
iOS Mail sometimes reformats pasted text to match its own default style. Shaking your phone to trigger Undo Paste, then pasting again, usually keeps your original formatting intact.
Both. It applies wherever you paste on iOS, including directly inside the Signature settings screen.
Not reliably. iOS's autoformatting behavior varies by iOS version. Shake-to-undo is the fastest fix when it happens.