Gmail is the world's most-used email service with over 1.8 billion users, so when it stops working, it affects a lot of people. Whether Gmail won't load in your browser, isn't sending or receiving emails, keeps asking you to sign in, or won't sync on your phone, this guide covers every scenario with clear fixes.
Fix 1: Check Google Service Status
Before troubleshooting, check if Gmail itself is down. Visit the Google Workspace Status Dashboard (workspace.google.com/status) or check DownDetector.com/status/gmail. If there's a widespread outage, the only fix is to wait for Google to resolve it.
Fix 2: Clear Browser Cache and Cookies
Corrupted cache data is the #1 cause of Gmail not loading properly:
- Chrome: Ctrl + Shift + Delete → select "Cached images and files" and "Cookies and other site data" → Clear data
- Firefox: Ctrl + Shift + Delete → select cache and cookies → Clear Now
- Safari: Safari menu → Preferences → Privacy → Manage Website Data → Remove All
- Quick test: Open Gmail in an Incognito/Private window first — if it works there, cache is the problem
Fix 3: Disable Browser Extensions
Ad blockers, privacy extensions, and email tracking extensions can break Gmail. Open chrome://extensions (or equivalent in your browser), disable all extensions, reload Gmail. If it works, re-enable extensions one by one to identify the culprit. Common troublemakers: uBlock Origin (rarely), Grammarly, Mailtrack, and Boomerang.
Fix 4: Update Your Browser
Gmail drops support for old browser versions regularly. Update to the latest version: Chrome: Menu → Help → About Google Chrome → Update. Firefox: Menu → Help → About Firefox. Safari: Update macOS (Safari updates come with macOS updates). Gmail officially supports the latest two major versions of each browser.
Fix 5: Free Up Gmail Storage
Gmail shares 15 GB with Google Drive and Google Photos. If you're full, you can't receive new emails:
- Check usage: drive.google.com/settings
- In Gmail, search "has:attachment larger:10M" to find big emails
- Empty Trash and Spam folders (they count toward quota)
- Delete old Google Drive files you no longer need
- Clear Google Photos backup if using original quality (consider High Quality setting which doesn't count toward quota)
Fix 6: Check Gmail Tabs and Filters
Gmail automatically sorts emails into tabs: Primary, Promotions, Social, Updates. "Missing" emails are often just in a different tab. Click each tab at the top of your inbox. Also go to Settings → Filters and Blocked Addresses to check for rules that auto-archive, auto-delete, or forward emails. Go to Settings → Forwarding and POP/IMAPto make sure forwarding isn't redirecting your emails.
Fix 7: Fix Gmail on iPhone/Android
- Check internet connection (try loading a website)
- Force close the Gmail app and reopen
- Open Gmail app → Settings → your account → make sure "Sync Gmail" is enabled
- Clear app cache: Settings → Apps → Gmail → Storage → Clear Cache (Android)
- Update the Gmail app from the App Store / Google Play
- If still not working, remove your Google account from the phone: Settings → Accounts → Google → Remove → re-add
Fix 8: Gmail Not Working in Outlook/Apple Mail
Using Gmail in a desktop email client? Make sure:
- IMAP is enabled in Gmail: Settings → See all settings → Forwarding and POP/IMAP → Enable IMAP
- Use the correct server settings: imap.gmail.com:993 (IMAP), smtp.gmail.com:587 (SMTP with TLS)
- If you have 2FA enabled, generate an App Password: myaccount.google.com → Security → App Passwords
- Google may block "less secure apps" — App Passwords bypass this restriction
Fix 9: Try Gmail Basic HTML Version
If Gmail won't load at all, try the simplified version: mail.google.com/mail/?labs=0or look for the "Load basic HTML" link at the bottom of the loading screen. The basic version works with any browser and slow connections. It lacks some features but lets you read and send emails when the standard version is broken.
Frequently Asked Questions
Why is Gmail not loading?
Gmail fails to load due to: (1) Browser cache/cookies are corrupted — clear them, (2) Browser extension conflicts — try Incognito mode, (3) Outdated browser — update Chrome/Firefox/Safari, (4) Gmail is down — check Google Workspace Status Dashboard, (5) Slow internet connection — Gmail needs a stable connection to load. Try mail.google.com/mail/?labs=0 for the basic HTML version.
Why am I not receiving emails in Gmail?
Check: (1) Spam folder — Gmail's filter catches many legitimate emails, (2) Promotions/Social/Updates tabs — emails may be sorted there instead of Primary, (3) Storage full — Gmail shares 15GB with Google Drive and Photos, (4) Filters deleting or archiving emails — check Settings → Filters and Blocked Addresses, (5) Email forwarding turned on — check Settings → Forwarding, (6) Google is having an outage.
Why does Gmail keep asking me to sign in?
This happens when: (1) Cookies are being cleared automatically (by browser settings or a cleaner app), (2) You're using a private/incognito window, (3) Browser extension is clearing session data, (4) Google detected unusual activity and is requiring re-authentication, (5) Multiple Google accounts causing session conflicts. Fix: check browser settings to make sure cookies from google.com aren't being auto-deleted.
How do I fix Gmail not sending emails?
Steps: (1) Check the Outbox/Sent folder — the email may have actually sent, (2) Reduce attachment size below 25MB — use Google Drive for larger files, (3) Check for error messages — 'bounced' means the recipient address is invalid, (4) Try sending from mail.google.com directly (not an email client), (5) Check if your account is temporarily suspended for unusual sending activity.
How do I fix Gmail not syncing on my phone?
Steps: (1) Check internet connection, (2) Open Gmail app → hamburger menu → Settings → your account → toggle 'Sync Gmail' off and back on, (3) Force stop the Gmail app and reopen, (4) Clear Gmail app cache: Settings → Apps → Gmail → Clear Cache, (5) Remove your Google account from the phone and re-add it, (6) Update the Gmail app from Play Store/App Store.
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