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

Bridge.exe by Proton AG is the executable file for Proton Mail Bridge, a tool designed to integrate Proton Mail, a privacy-focused encrypted email service, with third-party email clients such as Microsoft Outlook, Thunderbird, or Apple Mail. The tool works by running in the background to decrypt and encrypt emails locally on the user's device, preserving end-to-end encryption while allowing users to access their Proton Mail accounts through traditional email clients. This makes it easier to manage emails and utilize email client features while maintaining the robust privacy and security Proton Mail offers.

Researched by Laura @ SpyShelter Labs

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A Trojan is a harmful software that pretends to be a legitimate program or file to deceive users into downloading it. It can steal personal information, damage files, or give hackers control over the infected device.

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More about bridge.exe on WINDOWS

Who makes bridge.exe (Proton Mail Bridge)?

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