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What’s bridge-gui.exe (Proton Mail Bridge)? Is it safe or a virus?

Bridge-gui.exe, part of the Proton Mail Bridge application by Proton AG, is a tool that enables integration of Proton Mail with third-party email clients such as Outlook, Thunderbird, or Apple Mail. It acts as an intermediary by running locally on your device to encrypt and decrypt emails in real-time, ensuring that your messages remain secure while using these external email clients. The software lets you seamlessly access Proton Mail’s encrypted email service while maintaining compatibility with traditional email protocols (IMAP/SMTP). This ensures end-to-end encryption and privacy while providing the convenience of using familiar email interfaces.

Researched by Laura @ SpyShelter Labs

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More about bridge-gui.exe on WINDOWS

Who makes bridge-gui.exe (Proton Mail Bridge)?

We’ve found Proton AG should be the publisher of bridge-gui.exe.

How do we know? Our SpyShelter cybersecurity labs focuses on monitoring different types of Windows PC executables and their behaviors for our popular SpyShelter Antispyware software. Learn more about us, and how our cybersecurity team studies Windows PC executables/processes.

What does it mean if someone is the publisher of a PC .exe (executable or process)?

The publisher of an executable is the entity responsible for its distribution and authenticity. Most processes/executables on your PC should be signed. The signature on the executable should have been verified through a third party whose job it is to make sure the entity is who it says it is. Find an unsigned executable? You should consider scanning any completely unsigned .exe on your PC.

Last updated: March 11, 2025

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Why should you trust us?

Our team at SpyShelter has been studying Windows PC executables for over 15 years, to help fight against spyware, malware, and other threats. SpyShelter has been featured in publications like The Register, PC Magazine, and many others. Now we’re working to share free, actionable, and easy to understand information about Windows executables (processes) with the world, to help as many people as possible keep their devices safe. Learn more about us on our "About SpyShelter” page.

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