Open winmail.dat files privately
Read winmail.dat / TNEF and EML messages, view safe images, and download attachments without uploading them or installing Outlook.
What does this viewer do?
Mail File Viewer shows the sender, date, message, pictures, and attachments from up to 10 winmail.dat (TNEF) or EML files, right in this browser. Images from the internet stay blocked until you allow them.
| You bring | Up to 10 winmail.dat / TNEF or EML files |
|---|---|
| Limits | 25 MB each, 100 MB total, 100 MIME parts or attachments per file, 300 attachments in all |
| You can read | Subject, sender, date, To/Cc, the message as text or cleaned-up HTML, and the pictures in it |
| Attachments | Image thumbnails, PDF preview when you click, individual files or ZIP per message, plus one ZIP of everything |
| Where it runs | In this browser tab; nothing is uploaded and nothing about your files is tracked |
| Remote images | Blocked by default; loaded only for the message you are reading, after you click, and without a referrer (the image host is not told which page asked) |
How to open a winmail.dat file in your browser
winmail.dat is a TNEF package. Microsoft Outlook sometimes wraps ordinary attachments in its Transport Neutral Encapsulation Format. Other mail apps may show only the wrapper instead of the files inside it.
- Choose or drop the file. Add one winmail.dat file, or up to 10 winmail.dat or EML files at once.
- Review the message. Your browser shows who sent it, what it says, the pictures in it, and the names and types of its attachments.
- Download the attachments. Save one file, a ZIP for the message you are reading, or one ZIP of everything that opened.
Outlook is not required, and the selected mail never leaves this browser tab.
Your mail stays yours
This page has nowhere to upload a file to. Opening the mail, downloading attachments, and making ZIPs all happen in this browser tab. Cloudflare may count page visits, and the viewer may count three anonymous steps (started, opened, downloaded). Neither receives filenames, mail or attachment content, file properties, results, full referrers, queries, or error details. There are no ads.
Useful details
Does the file really stay on my device?
Yes. The viewer has no code that uploads files and no server to send them to. The files you pick stay in this tab's memory until you remove or clear them, or close the page.
What can I extract?
The viewer shows the sender, recipients, date, subject, and the message as text or cleaned-up HTML. Pictures that belong to the message are shown from the file itself; image attachments get thumbnails, and PDFs can be previewed after a click.
Can it open MSG or EML files?
It reads EML and winmail.dat / TNEF files. It does not open MSG, EMLX, or MHT files.
Why was my file rejected?
Each file gets its own message if it cannot be read as winmail.dat or EML, is cut off or damaged, has nothing readable inside, is over 25 MB or 100 parts or attachments, or would push the total above 300 attachments. Retry or remove that file; the others still open.
Can I try the viewer without my own file?
Yes. Click "Open a sample winmail.dat" in the viewer above to load a synthetic sample message. You will see its subject, body, and attachment list with thumbnails and downloads — the same view as for a real file, without uploading anything.