Email Signature on iPhone & Android — The Complete Setup Guide (2026)

The honest truth about mobile email signatures

Before we get into the how-to steps, it’s worth setting expectations. Mobile email apps were not designed with HTML signatures in mind, and most of them don’t support them natively. Here’s the quick summary of where we stand in 2026:

The bottom line: if you need a rich HTML signature with your logo, formatted text, and social links on mobile, the Outlook app is your best option. If you’re using Gmail on mobile, you’re stuck with plain text in the app — the HTML signature you set up in Gmail web will only appear when recipients receive emails sent from the web browser, not from the phone.

This is a genuine limitation, not something we’ve missed. Let’s walk through each platform and what’s actually possible.

iPhone — native Mail app setup

The native iPhone Mail app supports plain text signatures only. No images, no bold text, no colours, no logos. If that’s acceptable for your use case (and for quick mobile replies, it often is), here’s how to set it up.

On older iOS versions (before iOS 18), the path is Settings → Mail → Signature. Same result, slightly different navigation.

What to type in your plain text signature

Since you can’t add formatting or images, keep it clean and informative. A good plain text mobile signature looks like this:

That’s it. Four lines. The email address is technically redundant since it’s in the From field, but it becomes useful when the email gets forwarded or printed.

iPhone — Gmail app workaround

The Gmail app on iOS supports only plain text signatures set within the app. However, there’s a widely used workaround: configure your HTML signature in Gmail’s web interface, and use the Gmail web app in Safari (or Chrome) for emails where your HTML signature needs to appear.

For the Gmail app’s built-in plain text signature:

For HTML signatures in Gmail, you need to use the web interface. The Gmail signature guide walks through the full process of setting up an HTML signature in Gmail web, which will appear when you send from a browser. On mobile, you can add gmail.com to your Home Screen as a Progressive Web App to make access faster.

iPhone — Outlook app (best HTML option on iOS)

If you use a Microsoft 365 or Outlook.com account, the Outlook app on iOS is the best path to an HTML signature on your phone. The workflow is: configure your HTML signature in Outlook web, and the Outlook iOS app will use it when composing emails.

The Outlook app renders HTML signatures better than any other mobile email client. Images, logos, and formatted text all work. It’s not pixel-perfect compared to desktop Outlook, but it’s close enough for professional use. The full Outlook email signature guide covers desktop and web configuration in detail.

Android — Gmail app

Same story as iOS: the Gmail app on Android supports plain text signatures only. There is no native HTML signature capability in the Gmail Android app.

The Gboard text snippet workaround

One practical workaround on Android: if you use Gboard (Google’s keyboard), you can save a text snippet that expands to your full plain text signature. Type a short trigger like “mysig” and it pastes your name, title, phone, and email automatically. It’s not HTML, but it’s fast.

To set this up: open Gboard settings → Dictionary → Personal dictionary → add a word. Set the shortcut to something like “ssig” and the phrase to your full plain text signature.

For HTML signatures on Gmail Android, the cleanest approach is to use Chrome to open Gmail in desktop mode and send from there when appearance matters. Not ideal, but it works.

Android — Outlook app

Same as iOS: the Outlook app on Android offers the best HTML signature support of any mobile email client. The setup mirrors what we covered for iOS — configure in Outlook web first, then sync to the app.

If your signature was built with NeatStamp, the HTML it generates is tested for Outlook compatibility, which means it will render correctly in the Outlook app on Android. The free editor generates the code you’ll paste into Outlook web.

Android — Samsung Mail

Samsung Mail (pre-installed on Samsung Galaxy devices) has slightly better HTML signature support than the Gmail app. It won’t render complex HTML faithfully, but it can handle basic formatting: bold text, a company name in a different colour, a simple line break structure.

Samsung Mail’s rich text editor supports bold, italic, underline, font colour, and font size — enough to make a readable, styled signature without images. For images in Samsung Mail, some users paste HTML directly into the signature field, but results vary depending on the app version and Android version.

For best results on Samsung, the Outlook app is still the more reliable route to a proper HTML signature.

Remove “Sent from my iPhone” — and why you must

“Sent from my iPhone” is the default signature Apple adds to every new iPhone. Millions of people never remove it. Here’s why you should.

It tells your recipient that you didn’t bother to customise your email settings. In a professional context, that signals inattention to detail. It’s not a major professional crime, but there’s simply no upside to keeping it. There’s also a widespread (if slightly unfair) perception that it’s used as an excuse for typos — “sorry, sent from my iPhone” — which doesn’t reflect well.

Android doesn’t add a default device signature, but Gmail on Android used to add “Sent from Gmail” by default. If you see that in your Gmail app settings, remove it the same way as the custom signature setup above — just clear the field.

The best approach by situation

Here’s a quick decision guide based on your setup and what you actually need.

For related reading: the Gmail signature guide covers the full desktop setup, and the Outlook signature guide covers the Microsoft ecosystem in detail. The Apple Mail signature guide covers the macOS desktop experience (which is much better than iOS for HTML signatures). And if you’re curious about how image sizing affects how signatures look on mobile, the email signature size guide has the exact numbers.

If you need to build an HTML signature to use in Outlook web or the Outlook app, the NeatStamp editor generates mobile-compatible HTML and gives you the code to paste wherever you need it. The email signature best practices guide is also worth reading before you finalize anything.

Frequently asked questions