Online winmail.dat Reader
Read the message and preview hidden Outlook attachments in your browser - your file is never uploaded.
Drop your winmail.dat file here
or click to choose a file - it never leaves your browser
100% Private
The decoder runs as WebAssembly inside your browser. Your file and its contents never leave your device.
No Signup, No Limits
Decode as many winmail.dat files as you like, free. No account, no email address, no watermarks.
Same Engine as the App
This page uses the exact same decoding engine as Winmail File Viewer for iPhone, iPad, and Mac.
Get Winmail.dat Files on Your iPhone?
Open them straight from the Mail share sheet with Winmail File Viewer - offline and on-device.
Download Winmail File ViewerFree to try • Works offline • On-device processing
Winmail.dat Reader Online FAQ
Can I use this as a winmail.dat reader online?
Yes. The online decoder can read the message preview from a winmail.dat file and show the hidden Outlook attachments inside it.
Does the online reader upload my file?
No. Decoding runs in your browser with WebAssembly, so the winmail.dat file stays on your device.
Can it extract winmail.dat attachments?
The page previews the files inside winmail.dat and shows attachment names, types, sizes, and image thumbnails when available. Use the app when you need to save and share the extracted attachments.