How to Add an Email Signature in Every Major Mail Client (2026)
Six clients, six different signature settings, six different gotchas. Here's the fastest correct path in each — with the full walkthrough one click away.
Step by step
Apple Mail (Mac)
Mail → Settings → Signatures → + → write → drag onto the account → set the default. Full detail (including the image trap): Apple Mail guide.
iPhone / iPad
Settings → Apps → Mail → Signature. Plain text is easy; a designed signature with images needs the clean-HTML method: iPhone guide.
Gmail
Gear → See all settings → General → Signature → create, set the FOR NEW EMAILS / ON REPLY defaults, Save at the bottom: Gmail guide.
Outlook
Web: gear → Mail → Compose and reply. Mac: Outlook → Settings → Signatures. Windows classic: File → Options → Mail → Signatures: Outlook guide.
Yahoo Mail
Gear → More Settings → Writing email → toggle the signature on per account: Yahoo guide.
iCloud Mail (web)
icloud.com/mail → gear → Settings → Composing → Add a signature (plain text only — and it's separate from your Mac and iPhone signatures): iCloud guide.
Design once, install everywhere
Autograph: one click for Apple Mail, QR for iPhone, Copy HTML for the rest. One signature, every client.
Download Autograph free See the templatesCommon questions
Do signatures sync between these clients?
Almost never. Apple Mail syncs Mac-to-Mac via iCloud; everything else is per-client, per-device. Treat each client as its own install.
Which client is hardest to get a designed signature into?
Apple Mail (no HTML field — needs a native installer or file editing) and iPhone Mail (paste breaks images). Both have dedicated guides above.
Can I use the same HTML everywhere?
Yes — if it's built email-safe (tables, inline styles, hosted https images, explicit sizes). That's exactly what Autograph's Copy HTML exports.