What this site is
MSGConverter is a free web tool that opens Outlook .msg files and converts them into formats that other programs can read — EML, PDF, TXT, DOC, HTML, RTF, JPG and TIFF. It also includes a plain viewer, a batch converter, and a repair report for files that will not open.
The whole site is one page per job. There is no dashboard, no account, and no upsell to a desktop app, because the conversion genuinely does not need any of that.
Why it exists
The .msg format is Microsoft's own container. It stores a message as a Compound File Binary document full of MAPI properties, which means that outside of Outlook almost nothing can read it. If someone forwards you a .msg file and you use Gmail, Apple Mail, Thunderbird, or a phone, you are stuck.
Most answers to that problem are installers that want administrator rights, or upload sites that want your business correspondence on their server. Neither is a reasonable price for reading one email, so this site parses the file where it already is: on your own machine.
How the conversion works
Everything runs as JavaScript inside your browser tab. When you choose a file, the page reads it from disk, walks the Compound File Binary structure, extracts the MAPI headers, body and attachments, and writes out the format you picked. The result is handed to you as a normal download.
Because the parser is local, the site keeps working on a plane or behind a corporate firewall, and the files you convert never appear in a server log — there is no server involved in the conversion at all.
Who runs it
MSGConverter is an independent project maintained by one developer, not a company, and it is not affiliated with or endorsed by Microsoft. Outlook, Microsoft 365 and Windows are trademarks of Microsoft Corporation.
Running costs are covered by advertising, which is why you will see ad slots on some pages. Nothing about the conversion changes whether you block them or not.