About

I kept running into the same small problem: someone sends a .eml or .msg file, and there's no quick way to open it without installing Outlook or digging through a mail client. Most of the "converters" I found online wanted the file uploaded to a server first, which felt wrong for something that's often a private conversation.

EnvelopeTools runs every conversion in your browser. The file never leaves your device — there's no upload step to remove, because it was never built. You can turn off your network connection before using a tool and it will keep working.

This is a solo, self-funded project. There's no company, no team and no outside investment behind it — just one person building tools they wanted to exist, testing them against real email files from Outlook, Gmail, Apple Mail and Thunderbird, and fixing what breaks.

See how we test for the exact corpus of files each tool is checked against, and the changelog for what's changed recently. Something wrong or missing?Get in touch.