Online DAT File Reader

This specialized file utility allows users to read, decode, and extract contents from Winmail.dat attachments seamlessly online. Winmail.dat files are created by Microsoft Outlook and Exchange Server using the proprietary TNEF (Transport Neutral Encapsulation Format), which encapsulates email formatting and attachments. This format often creates compatibility issues when received by non-Microsoft email clients like Apple Mail, Gmail, or Thunderbird, appearing as unreadable attachments.

The tool processes the TNEF structure entirely within your browser using secure client-side parsing algorithms. It breaks the file down into its constituent parts, extracting the original rich text or HTML email body alongside any embedded attachments, such as PDFs, images, or documents. Once decoded, users can instantly preview the email content and individually download the extracted files to their device without needing specialized desktop software.

Privacy is a core feature of this utility. Because the decoding engine runs on local JavaScript through the HTML5 File API, your sensitive personal or business emails are never uploaded to our servers or transmitted over the internet. This ensures complete confidentiality while providing a fast, reliable solution for accessing trapped email data.