When we talk about opening dat files, we refer to Winmail.dat files, it is a file format containing email subject, email receiver and sender, message body and the attachment, with its original formatting in Microsoft Outlook. A dat file is created when the email recipient is not using Microsoft Outlook email client to read emails, in this case, a winmail.dat file opener is required.
It seems that there are so many users looking for solutions to open Winmail dat files online free, without installing any 3rd party Winmail viewers. For this reason, here we list 3 best online free Winmail.dat file opener, so you can open and view Winmail.dat files on Mac, on Windows PC, even on mobile device.
Cisdem Document Reader
Free DownloadWinmaildat.com ranks as No.1 in the Google search result for “open dat file online” and it does deserve such a good ranking.
It is an online free file viewer to open winmail.dat or ATT0001 files, as it claims, it is easy to use and there is no hidden costs, registration or email submission required, but there is a max file size: 50MB. While, I don't think such a file size limit will cause any troubles to most of our users, since we won’t attach too many too large attachment in an email.
Winmail-dat.com is another online free dat file opener, it allows users to read the message body directly on its website. However, it has more limitations. For example, you can only upload Winmail.dat file not exceeding 5MB, you won’t be able to download some attachments…
It is an online free Winmaildat opener in Germany, bearing a lot of resemblances with Winmaildat.com. It allows users to read and view Winmail.at or ATT0001, with a max file size limit of 100 MB. However, it may list duplicate files after decoding, like duplicate message body in RTF files, or duplicate attachments. Even, there are sometimes you cannot open the attachment after downloading.
| Winmaildat.com | Winmail-dat.com | Winmaildat.de | |
|---|---|---|---|
| Overall Rating | 4.0/5.0 | 3.8/5.0 | 3.8/5.0 |
| Allow Preview Message Body | No | Yes | No |
| Allow Download Attachments | Yes | Yes | Yes |
| Process Speed | Medium | Slow | Slow |
| File Size Limit | 50MB | 5MB | 100MB |
As you can see, there aren’t too many choices on online free Winmail.dat file viewer. In the first beginning, I was planning to dig some Winmail.dat to PDF online free tools to you, because there are so many tools offered online to export various files as PDF and it is much easier to read a PDF file than to read a Winmail.dat file. However, I later realized that there was no online free tool to save Winmail.dat as PDF format.
Maybe this is for the reason that a Winmail.dat may include attachments, when converting Winmail.dat to PDF, you have no way to export all those attachments to the PDF. It is pitiful, but we already have 3 best online free Winmail.dat viewers as we listed above.
Being free, online Winmail.dat viewers are indeed popular, but not all our users finally pick them as the tool to open their Winmail.dat files, due to their disadvantages. To extract all the information and attachments from a Winmail.dat file accurately, we may still need a processional Winmail.dat viewer.
Cisdem Document Reader is definitely the winner in this filed, which has won countless positive feedbacks from users and authorities.
It is a mac program to view and convert multiple Windows-based files, including Winmail.dat, Visio, DjVu, WordPerfect, WPS, XPS, OXPS and PDF. With its viewing tools, you can read any Winmail.dat files comfortably. Additionally, you will be allowed to convert files to PDF format.
Main Features of Cisdem Document Reader
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It is much easier to open Winmail.dat files on Windows and there are more choices for such a Winmail.dat viewer. Winmail.dat Reader and Saver is the best.
It works on Windows 10, allowing users to open, convert and save files from Winmail.dat, it is extremely easy to use.
Main Features of Winmail.dat Reader and Saver
It is not easy to open and view Winmail.dat files, but there are online free tools offered to help on this, and they do work. When opening Winmail.dat files online free, users are highly recommended not to upload confidential emails due to potential risk of information leakage. If you need to work on Winmail.dat files very often, just download and install a professional opener to do the job.
Bianca is a senior tech editor and strategist at Cisdem with Over 10 years of experience on PDF related solutions which covers all document editing, annotating, converting and managing etc.
