Smart Compose is the quiet workhorse of Gmail’s AI features. It does not write your email for you and it does not ask you for a prompt — it simply finishes your sentences in grey text as you type, and you accept the suggestion with a swipe. On a phone keyboard, where every saved word matters, that is worth more than it sounds.
The feature launched in 2018 as a web-only trick, then arrived on Android as a Pixel 3 exclusive before rolling out to every Android phone. Years later it is still here, still switched on by default for most accounts — and now it sits alongside a much bigger pile of Gemini features that people frequently confuse it with. This guide covers how to turn Smart Compose on or off in the Gmail app on Android, how to actually use it, how it differs from Smart Reply and Gemini’s “Help me write,” and what to do when it refuses to appear.
What Smart Compose actually does
Smart Compose is a predictive text feature built into Gmail itself, not into your keyboard. As you type the body of an email, Gmail predicts the rest of the phrase and shows it inline in light grey. If the prediction is right, you accept it and keep going. If it is wrong, you ignore it and keep typing — the suggestion disappears on its own.
It is at its best on the boilerplate that makes up most of an inbox: greetings, sign-offs, scheduling language, “let me know if that works for you,” “thanks for getting back to me,” “I’ve attached the.” It is not going to draft a difficult message for you. Think of it as autocomplete with a longer memory, not a ghostwriter.
Three things distinguish it from the other suggestion features in Gmail:
- Smart Compose completes the sentence you are already writing, inline, in grey.
- Smart Reply offers short canned replies (“Sounds good,” “Thanks!”) as chips at the bottom of a message you received.
- Help me write (Gemini) generates a whole draft from a prompt you give it, and is a separate, opt-in generative feature — not the same thing as Smart Compose.
Before you start: smart features must be on
Smart Compose depends on Gmail’s smart features and personalization setting. That single control is the master switch for a family of features — Smart Compose, Smart Reply, nudges, automatic inbox categorisation and summary cards. If you (or your IT admin) previously turned smart features off for privacy reasons, the Smart Compose toggle will either be missing or will have no effect.
Google has since split those controls into more granular options — a smart features page that separates personalisation across Google Workspace from personalisation in other Google products — so it is worth checking what is actually enabled on your account rather than assuming. If you are on a work or school Google Workspace account, your administrator can disable smart features org-wide, and nothing you do in the app will override that.
How to enable Smart Compose in Gmail for Android
The setting lives per-account, not per-device. Here is the path:
- Make sure the Gmail app is up to date. Open the Play Store, search for Gmail, and install any pending update. Predictive features are frequently gated behind app versions.
- Open Gmail and tap the Menu (three lines) icon in the top left, or swipe in from the left edge.
- Scroll to the bottom of the sidebar and tap Settings.
- Tap the account you want to change. This is the step people miss — Smart Compose is not a global app setting, so if you have three accounts signed in you have to set it for each one.
- Scroll down and switch Smart Compose on. A ticked box or a filled toggle means it is enabled.
Because this is a Google Account-level setting rather than a device one, turning it on here also turns it on for Gmail on the web and on your other signed-in devices. Turning it off does the same in reverse.
How to turn Smart Compose off
Exactly the same path — Menu > Settings > your account > Smart Compose — and switch it off. Plenty of people do. The two usual reasons are that the grey suggestions are visually distracting while composing, and that predictive text nudges your writing towards a flatter, more generic register than you would use yourself. If you want the suggestions gone but want to keep Gmail’s other conveniences, turn off Smart Compose alone rather than the whole smart features switch.
Using Smart Compose on your phone
Start a new message with the compose button in the bottom-right corner and begin typing the body. When Gmail is confident about what comes next, it shows the continuation in grey after your cursor.
- To accept a suggestion on Android: swipe right across the suggested text. The grey text becomes yours.
- To reject it: just carry on typing. There is nothing to dismiss.
- On the Gmail website: press Tab or the right arrow key instead.
Suggestions only appear in the message body. They do not appear in the subject line, in the recipient fields, or when you are editing a reply inline in some views.
Smart Compose personalization
There is a second, separate setting called Smart Compose personalization. With it on, Gmail tailors its predictions to the way you normally write — your habitual greetings, your sign-off, the phrases you reach for — instead of offering the same generic completions it would offer anyone. Google states these customisations stay private to your account.
The catch on mobile: personalization is adjusted from a computer, not the Android app. Open Gmail in a browser, go to Settings > See all settings > General and look for Smart Compose personalization. Once changed, it applies to your account everywhere, phone included.
Smart Compose is not showing up — what to check
If the toggle is on but you never see a grey suggestion, work through this list in order:
- Your language is not supported. This is the single most common cause. Smart Compose supports a short list of languages — English, Spanish, French, Italian and Portuguese. If you compose in anything else, or your Gmail display language is set outside that list, you will get nothing.
- Smart features are off. Check the smart features and personalization setting on your account, not just the Smart Compose toggle.
- You set it on the wrong account. Go back into Settings and confirm you selected the address you are actually composing from.
- Your admin disabled it. On Workspace accounts, smart features can be switched off centrally. Ask your IT contact.
- The app is out of date. Update Gmail from the Play Store, then force-stop and reopen it.
- You are not writing enough for it to predict. Smart Compose needs a running start — a few words of an ordinary sentence. It stays quiet on fragments, lists and unusual phrasing.
- Clear the app cache. Long-press the Gmail icon, open App info, then Storage, then Clear cache (not Clear storage). Reopen Gmail.
What about privacy?
Smart Compose is a personalisation feature, which means it works by processing the content of your messages. That is the trade: better predictions in exchange for Gmail reading what you write in order to model it. If that trade does not appeal, the honest answer is not to fiddle with Smart Compose alone — it is to review the smart features and personalization controls on your Google Account and decide, feature by feature, what you want Gmail doing with your mail. Turning the master switch off costs you Smart Reply, nudges and inbox categorisation as well, so make the decision deliberately.
While you are auditing Gmail’s behaviour, it is a good moment to also block email tracking pixels in Gmail and Chrome and to make sure two-factor authentication is switched on for the account.
Frequently asked questions
Is Smart Compose free?
Yes. Smart Compose and Smart Reply are standard Gmail features at no extra cost. The generative Gemini features — drafting a whole email from a prompt, summarising a thread — are a separate tier of functionality with their own availability rules.
Is Smart Compose on by default?
For most personal accounts, yes — Gmail offers suggestions unless you have turned them off or your smart features setting is disabled. You do not usually have to do anything to get it.
Does Smart Compose work on iPhone?
Yes, in the Gmail app for iOS, with the same account-level setting. The path is broadly the same: Menu, Settings, pick the account, then the Smart Compose switch. Because the setting is tied to your Google Account rather than the handset, changing it on Android changes it on your iPhone too.
Why are the suggestions so bland?
Because that is what it is optimised for. Smart Compose predicts the statistically likely next few words, which by definition means common phrasing. Turning on Smart Compose personalization helps — it shifts the predictions towards your own habits — but it will never suggest anything distinctive. Treat it as a typing shortcut, not a style aid.
Can I use Smart Compose in the subject line?
No. Suggestions appear only while you are typing the body of the message.
Will turning off Smart Compose turn off Gemini in Gmail?
No. They are separate controls. Switching off Smart Compose stops the inline grey predictions; the Gemini features are governed by their own settings and, on Workspace, by your administrator’s policy.
The bottom line
Smart Compose is one of the few AI features in Gmail that costs you nothing to try and takes ten seconds to reverse. Turn it on from Menu > Settings > your account > Smart Compose, write a few routine emails, and see whether the swipe-to-accept rhythm suits you. If the grey text irritates you more than it helps, the same three taps switch it back off — and if it never appears at all, check your compose language first, because that explains most cases.
Pair it with scheduled sending and a cleaner Gmail theme and the app on your phone starts to feel a good deal less like a chore.
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