Why Your Google Account Won't Sign Into Fitbit
If you cannot sign into the Fitbit app using your Google account, the most common causes are an outdated app version, cached login data that has become corrupted, or a mismatch between the email address you are trying to use and the one linked to your Fitbit account. Google and Fitbit occasionally update their authentication systems, and if your app has not updated in several weeks, it may no longer recognize Google's login method.
Less often, the problem is on Google's side: if you have two-factor authentication enabled on your Google account, or if Google has flagged suspicious login activity, it may block the Fitbit app from accessing your credentials. The Fitbit app also requires specific permissions to read your Google account information, and if those permissions were denied during setup, the app cannot complete the sign-in.
Key Takeaways
- Update the Fitbit app to the latest version available in your phone's app store, as outdated versions often cannot authenticate with Google.
- Clear the app's cached data and stored login information through your phone's Settings menu, then restart the app and try signing in again.
- If you have two-factor authentication on your Google account, you may need to generate an app-specific password in Google Account settings and use that instead of your regular password.
- Uninstall and reinstall the Fitbit app completely if clearing the cache does not work, as this removes all corrupted files that may be blocking authentication.
- If the app still will not sign in, try logging in through the Fitbit website first to confirm your account works, then attempt the app again.
Update the Fitbit App to the Latest Version
The first step is to check whether your Fitbit app is current. Open your phone's app store — the Google Play Store on Android or the App Store on iPhone — search for "Fitbit," and look at the app's page. If you see an "Update" button, tap it and wait for the installation to finish. If you see "Open" instead, your app is already at the latest version.
Outdated versions of the Fitbit app often lose compatibility with Google's authentication servers. Google updates its login security regularly, and Fitbit must update its app to match those changes. If your app has not been updated in more than a month, it is very likely the cause of your sign-in failure. After updating, close the app completely and reopen it, then try signing in with your Google account again.
Clear the App's Cached Data and Restart
Cached data is temporary information the app stores on your phone to load faster next time. Sometimes this cached login data becomes corrupted and prevents the app from signing in, even though your account is fine. Clearing it forces the app to start fresh.
On Android: Open Settings, tap Apps or process Manager, find and tap Fitbit, then tap Storage or Storage and Cache. Tap "Clear Cache" (not "Clear Data" — that erases your saved workouts). Close Settings, reopen the Fitbit app, and try signing in.
On iPhone: Open Settings, scroll down and tap Fitbit, then tap "Offload App." Tap "Offload App" again to confirm. Wait a few seconds, then tap "Reinstall App." This removes the app but keeps your data, then reinstalls it fresh. Open the app and try signing in.
Check Your Google Account's Two-Factor Authentication Settings
If your Google account has two-factor authentication (also called 2FA or two-step verification) enabled, Google may not allow the Fitbit app to sign in using your regular password. Instead, you need to create an app-specific password — a unique password just for the Fitbit app.
Go to myaccount.google.com in a web browser on your phone or computer. Tap or click "Security" in the left menu. Scroll down to "App passwords" (this option only appears if you have two-factor authentication turned on). Select "Fitbit" from the "Select app" dropdown and "Android" or "iPhone" from the device dropdown, then tap "Generate." Google will show you a 16-character password. Copy this password, open the Fitbit app, and try signing in using your full Google email address and this app-specific password instead of your regular password.
Uninstall and Reinstall the Fitbit App Completely
If clearing the cache did not work, a full reinstall removes all corrupted files and resets the app to factory condition. This is more thorough than clearing the cache alone.
On Android: Open Settings, tap Apps, find Fitbit, tap the three-dot menu, and tap "Uninstall." Open the Google Play Store, search for Fitbit, and tap "Install." Wait for installation to finish, then open the app and try signing in.
On iPhone: Press and hold the Fitbit app icon on your home screen, tap "Remove App," then tap "Delete App" and confirm. Open the App Store, search for Fitbit, tap the cloud icon to read it, and wait for installation. Open the app and try signing in.
After reinstalling, the app will ask you to grant permissions — make sure you tap "Allow" or "Yes" when it asks for permission to access your Google account. Denying these permissions is a common reason sign-in fails.
Sign In Through the Fitbit Website First
If the app still will not sign in, test whether your account itself works by signing in through a web browser. Go to fitbit.com and click "Log In" in the top right. Select "Sign in with Google," then enter your Google email and password. If this works, your account is fine and the problem is specific to the app.
If the website sign-in also fails, the issue is with your Fitbit account or Google account, not the app. In that case, go to accounts.google.com/signin/recovery to recover your Google account, or contact Fitbit support through their website for account-level help. If the website sign-in works but the app still does not, try the app again after waiting a few hours — sometimes the app's authentication servers need time to sync with Google's servers after an update.
Grant the Fitbit App Permission to Access Your Google Account
During sign-in, your phone will show a Google permission screen asking whether the Fitbit app can access your Google account information. If you tapped "Don't Allow" or "Deny" on this screen in the past, the app cannot sign in even if your account is correct.
To fix this, uninstall the Fitbit app, reinstall it, and when the permission screen appears, tap "Allow" or "Yes." If you are not sure whether you denied permission, uninstall and reinstall anyway — the reinstall clears any previous permission choices and lets you start over.
Frequently Asked Questions
Why does the Fitbit app say "invalid credentials" when my Google password is correct?
This usually means the app's cached data is corrupted, or you have two-factor authentication enabled and need to use an app-specific password instead. Try clearing the app's cache first. If that does not work, check whether you have two-factor authentication on your Google account and generate an app-specific password as described above.
Can I sign in with my Fitbit account instead of Google?
Yes. On the Fitbit app's sign-in screen, look for a "Sign in with email" or "Don't have a Google account?" link. Tap it and enter the email address and password you used to create your original Fitbit account. This bypasses Google entirely if you prefer.
What if I forgot my Google password?
Go to accounts.google.com/signin/recovery in a web browser and follow the steps to reset your password. You will need access to a recovery email or phone number linked to your account. Once you have reset your password, try signing into the Fitbit app again.
Does clearing the cache delete my Fitbit workout data?
No. Clearing the cache removes only temporary login and display data. Your workout history, steps, and other data are stored on Fitbit's servers and will still be there after you sign in again. Clearing the cache is safe.
How long does it take for the Fitbit app to work after I update it?
Usually when ready. After updating, close the app completely and reopen it. If sign-in still fails, wait a few hours — occasionally Fitbit's servers need time to recognize the new app version. If it still does not work after a few hours, try clearing the cache or reinstalling.