Mobile email signature: what each phone app can hold, and a short version to reuse

A mobile email signature is not the one on your laptop. Each phone mail app keeps its own signature field, with its own limits, and which app you send from decides what recipients see. The quickest route is to write one short text version, then paste it into every phone app you use. This page compares what the main apps can hold, using Google’s Gmail help and Microsoft’s page for Outlook on iOS and Android, and Apple’s iPhone User Guide page on Mail settings, read in October 2026. Where a page does not say something, we say so.

Mobile email signature by app: what it can hold

App	Where the setting is	What it holds	If you set nothing
Gmail on Android	Menu, Settings, your account, Mobile signature	Google calls a signature text, such as contact information, added at the end of messages	Google says new messages use the signature from your computer
Gmail on iPhone and iPad	Menu, Settings, Signature settings, switch on Mobile Signature	Text, as above	Google says messages use the signature you set on your computer
Outlook for iOS and Android	Settings, Mail, Signature; switch on Per Account Signature for separate ones	Microsoft’s page names the steps but not the contents	Not stated on the page
Mail on iPhone	Settings, Apps, Mail, Signature (then Per Account)	Apple says you can only use text there. Steps in our iPhone guide	Not stated
Samsung Email	In the app’s account settings	We did not open a Samsung help page, so we cannot say	See the Samsung guide

Two points matter most. First, the Gmail rule: if no mobile signature exists in the Gmail app, Google says new messages use the signature from your computer. That means a phone with no setting can still show your signature, which is why a reply from a phone sometimes looks fine and sometimes not. Second, if the app holds only text, a logo or banner will never travel with a phone message. The signature must still make sense without them.

Detailed clicks live in the app guides: Gmail on iPhone, Gmail on Android and Outlook on iPhone.

How to set a mobile email signature in each app

These are the shortest paths, from the vendors’ pages.

Gmail app, Android

1. Open the Gmail app and tap the menu at the top left.
2. Scroll down, tap Settings, then choose your Google Account.
3. Tap Mobile signature, enter the text and tap OK.

Gmail app, iPhone or iPad

1. Open Gmail, tap the menu, then Settings.
2. Under Compose and Reply, tap Signature settings.
3. Turn on Mobile Signature, add the text and tap Back to save.

Outlook app, iOS or Android

Open Settings, tap Signature under Mail, and type it. To give each account its own, switch on Per Account Signature. Microsoft’s page does not list the formatting or pictures the app allows, so check on your own screen.

Mail app, iPhone

Open Settings, then Apps, then Mail, and tap Signature below Composing. Per Account is an option when you have several mailboxes. The steps are in our iPhone guide.

A short mobile email signature you can reuse

Phones show fewer characters on a line, and text signatures cannot carry a logo. So write a short version once, and use the same one in every phone app.

Line	Content	Example
1	Name	Maya Chen
2	Role and company	Head of Partnerships, Harbour Studio
3	One number, international form	+1 415 555 0142
4	Website	harbourstudio.example

How the phone version relates to the computer one:

On the computer signature	On the phone
Logo	Leave out. The company name appears in line 2
Social icons	Leave out, or add one profile address as text
Two or three phone numbers	Keep your direct number only
Address and registration line	Leave out unless your company requires it on every message
Legal notice	Keep it if required; see the disclaimer guide for server-level options

Keep the wording identical to the computer version where you can. A name spelled one way on the laptop and another on the phone makes a company look careless. Our plain text guide has more text-only layouts.

Here is what a designed, compact computer signature that matches this short version looks like, drawn by emailfooter with made-up details:

A compact layout that pairs with a four line phone version. The company and person are made up.

Wording rules for the phone version

A phone screen is narrow, so a few habits help the short version read well.

• Short lines. Keep each line under about 40 characters, which is our guess at what fits a narrow screen without wrapping. Test on your own phone.
• Digits with a plus sign. Write the number in international form, with the country code, so it works for a reader abroad. See writing a phone number internationally.
• No apology line. A phone note that says the message is brief tells the reader nothing about you. Your name, role and number do.
• One address. Skip the email address, since the message already carries it in the From line.
• Test with a real send. Judge the result from a message that arrives, not from the settings screen, since lines can wrap differently in the reader’s app.

When a phone signature goes wrong

What you see	Likely cause	What to do
No signature when sending from the phone	The app has none set, or the switch is off	Add one in that app’s settings
The old signature appears	An old mobile signature was never updated	Edit it in the app
Two different signatures, one per account	Per-account settings differ	Set them to match
Your logo is missing on the phone	Text only, or the reader blocks pictures	Use the text version; see signature not showing
Fine on the laptop, plain on the phone	A mobile signature overrides the computer one	Expected, since they are separate

Keep every mobile email signature consistent

For one person, the work is a minute per app. For a team, the same question comes back every time someone changes job title: who updates the phone copies? A practical routine is:

1. Keep the short text version in one shared note, or on one page everyone can open.
2. When a title or number changes, update the note first.
3. Ask each person to paste it into their phone apps the same week.
4. Check a sample by having a colleague send you a message from their phone.

emailfooter can give each employee the designed signature for their computer with numbered steps per app, and it keeps the company details in one place. It does not install anything on phones, and it is English-only for now, so the phone paste is still manual.

Frequently asked questions

How do I set a mobile email signature on my phone?

Open the mail app’s settings and look for Signature or Mobile signature. In Gmail on Android it is under your account, in Outlook it is under Mail, and in iPhone Mail it is under Composing.

Why does my email signature on phone differ from my computer?

Phone apps keep their own signatures. The exception, per Google, is that the Gmail app uses your computer signature when no mobile one is set.

Can I add a logo to a mobile email signature?

Not in Gmail’s mobile signature or iPhone Mail, which hold text. Use the company name in words.

How do I set an email signature on a phone for several accounts?

In Outlook, switch on Per Account Signature. In iPhone Mail, tap Per Account. In Gmail, each account has its own settings.