Gmail App Not Syncing on Android: Diagnose It in Order

The Gmail app not syncing on Android is a frustrating problem with a short list of causes — and the order you check them in matters. The most common fix takes thirty seconds. The nuclear option, clearing app data, takes five minutes and makes you sign back in. This guide works through them cheapest-first so you spend a minute on the most common culprits before reaching the drastic ones.

The five causes, in the order you should check them: the Gmail sync toggle inside the app itself, Android's system-level account auto-sync, battery optimization restricting Gmail in the background, a device storage that is too full to write new data, and corrupt cache data that needs clearing. Most people who are wondering why Gmail is not updating on their phone find the answer in steps one through three.

The short answer#

If the Gmail app on your Android phone stopped receiving emails, open Gmail, go to Settings, tap your account name, and check that "Sync Gmail" is switched on. If it is on, go to Android Settings > Accounts > Google > your account and confirm that account-level sync is also enabled. If both are on, battery optimization is almost certainly the cause.

Android classifies Gmail as an infrequently used app after certain system events — a reboot, an OS update, a low-battery episode — and starts restricting its background activity. When that happens, Gmail stops pulling in mail unless you open the app manually. The fix is to set Gmail's battery mode to Unrestricted. On a Pixel running stock Android this is at Settings > Apps > Gmail > App battery usage > Unrestricted. On Samsung One UI the path is Settings > Apps > Gmail > Battery > Unrestricted. The exact location varies between manufacturers, but the principle is the same: you are telling Android that Gmail is allowed to run in the background without restriction.

If you checked all three of those and Gmail is still not syncing, continue below — the remaining sections cover storage, cache, account removal, and what to do when the problem is on Google's servers rather than your phone.

Before you start: two quick checks#

Before adjusting any setting, confirm your internet connection is working. Open a browser and load any page. If wifi is working but mobile data is not — or the reverse — you may be looking at a connectivity issue rather than a Gmail one. If the Gmail app works on wifi but not mobile data specifically, skip to the callout near the end of this guide; that scenario has its own fix.

Also check whether Google's servers are the problem. Search for "Google Workspace status" or visit google.com/appsstatus to see the service health dashboard. When Gmail sync is currently experiencing problems on Google's end, no setting on your phone will fix it — the outage has to resolve on Google's side. If multiple people you know are reporting the same issue at the same time, a server problem is the likely explanation.

How to fix Gmail not syncing on Android: step by step#

Work through these in order. The first three cover the great majority of cases. Menu names and paths vary by Android version and manufacturer skin — each step below describes the setting and its purpose so you can locate the equivalent on your device even if the exact wording differs.

1. 1

   Check the Gmail sync toggle inside the app

   Open Gmail and tap the hamburger menu (three horizontal lines) at the top left. Scroll to the bottom and tap Settings. Tap your account's email address. Scroll down and find a toggle labelled Sync Gmail or simply Sync. Make sure it is switched on. When this toggle is off, Gmail stops fetching new mail entirely. It is easy to disable by accident, and Android occasionally turns it off during low-memory events or as part of an automatic battery-saving intervention.

2. 2

   Enable Android account-level auto-sync

   Open the Android Settings app. Go to Accounts — listed on different phones as Accounts and backup, Passwords and accounts, or Users and accounts. Tap Google, then tap your Google account's email address. You will see a list of Google services with individual sync toggles; make sure the Gmail toggle is on. There is often a master Sync account or Auto-sync data button at the top of the same screen — if it shows as paused or off, tap it to re-enable. The Gmail app's own toggle and Android's system-level sync must both be active; either one being off is enough to stop mail from arriving.

3. 3

   Set Gmail's battery mode to Unrestricted

   Open Settings > Apps (or Application manager on older Android versions) > Gmail > Battery. You will see options such as Unrestricted, Optimized, and Restricted. Set it to Unrestricted. On some phones — particularly OnePlus and Xiaomi — this option lives at Settings > Battery > Battery optimization > All apps > Gmail > Don't optimize. When Gmail is in the Optimized state, Android suspends its background processes a few minutes after the screen goes off. New mail never arrives unless you open the app. This is by far the most frequently overlooked setting, especially after an Android update resets it silently.

4. 4

   Free up device storage

   Android pauses background data operations, including email sync, when device storage drops to a critically low level — typically below about 500 MB to 1 GB, depending on the manufacturer. Open Settings > Storage and check how much free space remains. If the device is nearly full, clear some space first: delete unused apps, move photos to a cloud service, or use the built-in storage cleanup tool. Once free space rises above the threshold, Gmail will generally resume syncing automatically without any other action needed.

5. 5

   Clear the Gmail cache

   Go to Settings > Apps > Gmail > Storage (labelled Storage and cache on some phones). Tap Clear cache. This removes temporary files — search indexes, attachment previews, UI state data — that Gmail has accumulated, without deleting your account or any email. It is a safe, reversible operation. After clearing, open Gmail and wait a moment for it to reconnect. A corrupted local index is an infrequent cause of sync failures, but clearing the cache resolves it cleanly when it is.

6. 6

   Clear Gmail app data

   If clearing the cache did not fix the problem, return to the same Storage screen and tap Clear data or Clear storage. This removes everything Gmail has stored locally, including your sign-in credentials. You will need to add your Google account again when Gmail next opens. All your actual email is safe — it lives on Google's servers, not on your phone. After signing back in, allow a few minutes for Gmail to complete its initial sync. This step resolves failures caused by a corrupted local database or an authentication token that got into a broken state.

Where to find sync settings on different Android phones#

The settings described above exist on every Android phone, but the menu paths differ considerably between manufacturers. Samsung, Xiaomi, and OnePlus all ship customized Android versions that rename and reorganize the battery and accounts sections. The table below maps the three most important settings to their locations across the four most common Android variants. If your phone is not listed, the stock Android (Pixel) path is the closest reference.

What to do when Gmail still won't sync#

If you have worked through all six steps and Gmail is still not receiving email, there are a few more things to try before reinstalling the app or contacting Google support.

Check the number of days of mail Gmail is set to sync. Open Gmail > Settings > your account > Days of mail to sync. If this is set to 90 days or higher, Gmail may be attempting to download an unusually large volume of mail on each sync attempt and timing out, especially on a slower mobile connection or immediately after adding a large account. Drop the value to 30 days and see whether sync starts. You can increase it again once the app is stable.

Remove and re-add your Google account. This is more involved than clearing app data but resolves a different class of problem: authentication tokens that Android considers valid but that Google's servers are rejecting. Go to Settings > Accounts > Google > your account > Remove account. Then add the account again via Settings > Accounts > Add account > Google. Everything re-downloads from Google's servers; no email is lost.

Uninstall Gmail updates and reinstall. On most Android phones, Gmail is a system app and cannot be fully removed, but you can roll back to the factory version: Settings > Apps > Gmail > tap the three-dot menu at the top right > Uninstall updates. Then open the Play Store, search for Gmail, and install the current update fresh. This clears problems caused by a bad update that corrupted the app's internal state.

Wait for Google to resolve a server outage. If Gmail accounts on multiple devices are all failing to sync at the same time, and the Google Workspace Status Dashboard shows a Gmail incident, the fix is simply to wait. No local setting change will resolve a server-side problem, and repeatedly clearing the cache will not speed up Google's recovery. Check the status page again after 30 to 60 minutes.

A faster way to keep Gmail under control on any device#

The steps above fix the sync problem, but they solve the symptom rather than the underlying friction: Gmail on Android is a passive inbox that requires you to open it, read through everything, and reply to each message manually. We build AI Emaily, an AI-native email client that connects to Gmail via OAuth. On Android it runs as a PWA — install it to your home screen from the browser and it behaves like a regular app, with push notifications and offline reading.

Once connected, AI Emaily's agent triages incoming mail, drafts replies in your voice using your Personal Context brain and per-sender client profiles, and handles routine messages on Autopilot within the rules you define. Every action requires your approval in Copilot mode, or runs automatically in Autopilot within the boundaries you set — with undo and a full audit trail either way. If you want an email client that does the work rather than just delivering it, AI Emaily pricing starts with a 7-day free trial on both Pro and Autopilot plans.