Proton Mail Not Working? Sign-In and App Fixes Step by Step

When Proton Mail will not let you sign in or the page will not load, the cause is usually on your side: a wrong password or username, a corrupted browser cache, a browser extension, disabled cookies or session storage, or a temporary block on the network you are using. Proton’s own help pages list a fix for each of these, and the mobile apps have a separate checklist. If none of the steps below work and people on other networks report the same problem, the trouble may be with Proton itself, so check Proton’s official channels for a service notice.

Is Proton Mail down, or is it just me?

The quickest test is to try a second route in. Sign in from a different browser, from one of Proton’s apps, or from another network such as your phone’s mobile data. If one route works, Proton’s servers are up and the problem is with the device, browser or network you started on. If nothing works anywhere, look for an official notice from Proton before changing settings. The same approach works for other services, as in our guide to checking Apple’s status before fixing iCloud.

Why won’t Proton accept my password or username?

Most failed sign-ins come down to small typing mistakes. Proton’s guide to sign-in issues suggests clicking the eye icon next to the password field to see what you actually typed.

• Passwords are case-sensitive, so check that Caps Lock is off.
• If you pasted the password, make sure no extra spaces came along with it.
• If you have more than one Proton Account, confirm the password belongs to the account you are signing in to.
• With a Proton Mail address, you can enter either the username alone or the full address ending in proton.me.
• With a non-Proton address, you have to enter the full email address. The username alone will not work.
• Older accounts may use an address ending in protonmail.ch instead of protonmail.com or proton.me. Check the domain, or try just the username.

Proton can send a username reminder to your recovery phone number or recovery email address, and it has a separate recovery process for a lost password.

How do I fix Proton Mail in a web browser?

Work through these steps in order, trying to sign in after each one.

1. Clear your browser’s cache and cookies, then restart the browser. Proton says a corrupted cache sometimes causes sign-in problems.
2. Open a private or incognito window and sign in there. If that works, go back to a normal window and turn off your extensions one by one, signing in after each, until you find the one causing trouble.
3. Make sure JavaScript, session storage and cookies are enabled. Proton needs all three for web sign-in.
4. Turn off your password manager and type the password by hand. Proton notes that some password managers do not work with its services, especially in two-password mode.
5. Switch to a different browser or use a Proton app.

Proton names one extension with a known conflict: in Random Agent Spoofer, the option “Disable Authorization headers” must be unchecked for Proton Mail to work.

Why does Proton Mail not load on my iPhone in Safari?

A blank screen or an “Absolute Security” message saying a modern web browser is required on an iPhone usually means Safari is in Private mode. According to Proton’s page on screens not loading in iOS, Proton Mail depends on sessionStorage, and Private browsing turns it off. Switch Safari back to a regular tab and reload the page.

What does it mean if Proton temporarily blocks my sign-in?

Proton’s security system may briefly stop sign-ins from a network or device after it detects a lot of suspicious activity there. Proton’s page on temporarily blocked logins says this does not mean you did anything wrong. The usual reason is that someone else ran large-scale malicious activity on the same network, or used your network as a proxy. Your account keeps receiving messages while the block lasts.

Anonymization proxies, the Tor network and VPNs get more security checks, rate limits and “Are you a human?” tests, and sometimes lose access for a while after heavy abuse from that network. Proton says it does not permanently reject any network. To get in sooner:

• Connect through a reputable internet provider. Proton says a home connection works in the vast majority of cases.
• On a phone, use only Wi-Fi hotspots you trust, or switch to carrier data. If carrier data shows the error, disconnect from the mobile network and reconnect.
• If you must use a VPN, switch to another server. Proton also suggests a paid VPN server.

To avoid future blocks, keep your devices’ operating systems and software updated, make sure nobody has unauthorized physical access to them, and avoid apps that sell access to your network.

How do I fix the Proton Mail app on iPhone or Android?

Proton’s mobile app troubleshooting guide lists these steps for both platforms:

1. Update the app to the latest version from the App Store or Play Store.
2. Close the app and open it again.
3. Sign out and sign back in.
4. Delete the app and reinstall it.
5. If the problem continues, send a report with the app’s report bug feature.

If the report feature does not work either, contact Proton directly and include whether you use iOS or Android, your device model, your operating system version and the app’s version number. Sign-in trouble in banking and work apps follows a similar order, as our LinkedIn sign-in fixes show.

Quick answers

Why does my two-factor code keep failing?

Check the time on your phone or computer. Proton says 2FA might not work properly if the device clock is wrong.

I lost my authenticator app or security key. Can I still sign in?

Yes. Use one of the recovery codes Proton gave you when you set up 2FA, or another recovery method on your account.

Will I miss email while I cannot sign in?

No, according to Proton. During a temporary block your account keeps receiving messages as usual.

Can I sign in with just my username?

Only with a Proton Mail address. Accounts that use a non-Proton email address must enter the full address.

Checked against official sources in November 2026. Apps, menus and error codes change: check the official help page for the current steps.