Mobile email clients now account for 41.6% of all opens — ahead of desktop on its own — yet the signature you carefully built on your computer almost never rides along to the Gmail app. The reason is simple once you know it: the app keeps its own separate signature, tucked behind a setting most people never open. Here’s exactly where to find it on Android and iPhone, why your HTML web signature won’t follow you, and how to get a clean, professional sign-off on every email you send from your phone.
Want one HTML signature across every account? Try MailbirdWhy Gmail keeps a separate mobile signature
The Gmail mobile app stores its own signature, called the Mobile Signature, which is independent of the one you set in Gmail on the web. Google’s help docs note that if you haven’t set a mobile signature, new messages fall back to your computer signature — but in practice an HTML signature with images and links renders inconsistently on phones, so a dedicated mobile signature is the dependable choice.
This trips up almost everyone. You spend twenty minutes building a polished signature with your logo, job title and a LinkedIn link on the desktop, then send a mail from your phone and it shows up bare — or with the image broken. That’s not a bug. The Gmail apps were designed with a lightweight, text-only signature field of their own, separate from the rich web version.
I tested this on both my Android phone and an iPhone with the same Google account. The behavior was consistent: until I typed something into the app’s Mobile Signature field, my phone-sent emails ignored the elaborate web signature entirely. Once you accept that the mobile signature is its own thing, the setup takes about thirty seconds. If you also manage signatures elsewhere, our guide to creating a Gmail HTML signature covers the web side in full.
Add a signature in the Gmail Android app
On Android, open the Gmail app, tap Menu (top left), scroll to Settings, choose the account you want, tap Mobile Signature, type your sign-off, and tap OK. The signature applies immediately to new emails, replies and forwards from that account.
The full sequence, step by step:
- Open the Gmail app on your Android phone or tablet.
- Tap the Menu icon (three lines) in the top-left corner.
- Scroll down and tap Settings.
- Tap the Google Account you want the signature for.
- Tap Mobile Signature.
- Enter the text for your signature.
- Tap OK to save.
That’s it — no save button elsewhere, no sync delay. Send yourself a test email to confirm it looks right. Because Android applies the signature to replies too, keep it short so it doesn’t pile up at the bottom of long threads. If you run several Google accounts on one device, repeat the steps for each, since the setting is per account.
Add a signature in the Gmail app on iPhone and iPad
On iPhone or iPad, open Gmail, tap Menu, then Settings, then under Compose and reply tap Signature settings. Turn on Mobile Signature, type your text, and tap Back to save. Like Android, it’s set per account and is separate from your web signature.
Apple’s version hides the toggle one level deeper:
- Open the Gmail app on your iPhone or iPad.
- Tap Menu, then Settings.
- Under Compose and reply, tap Signature settings.
- Turn on the Mobile Signature switch.
- Add or edit your signature text.
- Tap Back to save.
The switch matters: if Mobile Signature is toggled off, nothing appends no matter what you type. This is the single most common reason an iPhone user swears their signature “disappeared.” Flip it on, confirm the text, and send a test. For keyboard-driven shortcuts that speed up everything else in Gmail, see our list of Gmail keyboard shortcuts.
The plain-text limit: no logo or HTML on mobile
The Mobile Signature field in both Gmail apps is plain text only. You cannot add an image, a company logo, colored text, clickable buttons or HTML formatting directly in the app. A signature with visual branding has to be built in Gmail on the web, and even then it may not display fully on phones.
This is the real constraint to plan around. The mobile field accepts characters — your name, title, phone number, a typed-out URL — and nothing else. There’s no formatting toolbar, no image picker, no link styling. So the elegant signature with a logo and social icons simply isn’t possible from the phone itself.
If a branded HTML signature is non-negotiable, two paths work: build it on the web and accept that mobile-sent mail may strip it, or use a desktop email client that pushes one consistent signature across every device. Our walkthrough on adding an image or logo to a Gmail signature shows the web method in detail.
Need consistent HTML signatures everywhere? Try MailbirdFix a mobile signature that won’t show
If your signature isn’t appearing on the Gmail app, check three things: that Mobile Signature is turned on (iPhone), that you set it on the account you’re actually sending from, and that you’re not expecting a web HTML signature to carry over. Entering plain text in the right account’s Mobile Signature field resolves nearly every case.
Run down this quick checklist when nothing shows:
- Wrong account. The signature is per account. If you send from a second address, set it there too.
- Toggle off (iPhone). Mobile Signature has to be switched on; the text field alone does nothing.
- Expecting HTML. A web signature with images won’t reliably appear on phone-sent mail. Type a plain-text version in the app.
- App needs a refresh. Force-close Gmail and reopen it after saving, then send a test.
For the full diagnostic tree — including web-side causes and the difference between new mail and replies — our dedicated guide on why a Gmail signature is not showing walks through every scenario.
What to actually put in a mobile signature
Keep a mobile signature to two or three lines: your name, your role or company, and one contact method. Long signatures look cluttered on small screens and stack up awkwardly in reply chains, so trim everything that isn’t essential.
Because phone emails are often quick, one-thumb replies, a heavy signature reads as noise. A practical template I use:
Alexis Dollé
Founder, Email Tools
alexis@email-tools.meThat’s enough to be recognized and reachable without dominating the message. Skip the legal disclaimer, the inspirational quote and the five social links — those belong, if anywhere, in a web signature people see on desktop. If you handle multiple inboxes from one phone, pairing tidy per-account signatures with a clear email organization system keeps your sent mail looking deliberate rather than chaotic.
Verdict: the fastest reliable setup
For most people, the right move is a short plain-text Mobile Signature set directly in the Gmail app on each account, plus a richer HTML signature on the web for desktop sends. Don’t fight the platform: the mobile field is text-only by design, and a concise sign-off beats a broken logo.
Best for everyday use: a clean, two-line mobile signature you set once per account. It always renders, never breaks, and looks intentional on a phone screen.
Skip the workaround if: you only occasionally need branding on mobile — it’s not worth pasting HTML that may not display. Reach for a desktop client like Mailbird if: you juggle several accounts and want a single, consistent HTML signature managed in one place and applied everywhere you write.
Alexis Dollé, email expert for 10+ years. Founder of Email Tools. I test every email client and utility myself, then write about them the way I’d explain them to a friend — no marketing fluff, no sponsored rankings, every claim sourced.
LinkedInSources & references
- Google Gmail Help — Create a Gmail signature. Supports the Android (Menu > Settings > account > Mobile Signature) and iPhone/iPad (Settings > Compose and reply > Signature settings) steps and the fallback-to-computer-signature note. Accessed 2026-06-02. support.google.com/mail/answer/8395
- Salesso / Litmus — Mobile Email Statistics 2025. Supports the 41.6% of email opens on mobile clients vs 16.2% desktop figure. Accessed 2026-06-02. salesso.com/blog/mobile-email-statistics
- Email Tools — Create a Gmail HTML signature. Internal guide to the web rich-text signature. Accessed 2026-06-02. email-tools.me/posts/gmail-html-signature/
- Email Tools — Why a Gmail signature is not showing. Internal troubleshooting guide. Accessed 2026-06-02. email-tools.me/posts/gmail-signature-not-showing/
Frequently asked questions
Does my Gmail desktop signature show on the mobile app?
Not reliably. The Gmail mobile app uses its own Mobile Signature setting. Google’s help docs say that if you haven’t created a signature in the app, new messages fall back to the one from your computer — but image-and-link HTML signatures often render inconsistently on mobile, so setting a dedicated mobile signature is the reliable fix.
Where is the Mobile Signature setting in the Gmail app?
On Android: tap Menu, then Settings, choose your account, then tap Mobile Signature. On iPhone or iPad: tap Menu, then Settings, then under Compose and reply tap Signature settings and turn on Mobile Signature.
Can I add an image or logo to my Gmail mobile signature?
No. The Mobile Signature field in the Gmail app is plain text only — no images, logos, links styled as buttons, or HTML formatting. For a signature with a logo, build it in Gmail on the web, where the rich-text editor supports images and links.
Is the Gmail mobile signature set per account?
Yes. If you have several accounts in the Gmail app, you set the Mobile Signature separately for each one. Switching the account at the top of Settings lets you give each address its own sign-off.
Why isn’t my signature showing on the Gmail app at all?
The most common causes are not enabling Mobile Signature on iPhone, setting it on the wrong account, or expecting an HTML web signature to carry over. Enter the text directly in the app’s Mobile Signature field for the specific account you send from.
Does the mobile signature appear on replies and forwards?
Yes, the Gmail app appends your Mobile Signature to new emails, replies and forwards from that account. If you don’t want it on quick replies, you’ll need to delete it manually in each message, as there’s no reply-only toggle.
Related: Create a Gmail HTML signature — build the rich web version. Add an image or logo to a Gmail signature — branding done right. Why a Gmail signature is not showing — fix the disappearing sign-off.