MHTML Viewer for TagSpaces

A TagSpaces extension allowing you to open MHTML and EML files.


  • Viewing of MHTML/MHT files - MHTML is file format for saving web pages with all the images and styling information in one single file. Saving in MHTML format is natively supported by Chrome™, Internet Explorer™ and Firefox™ (with the help of the MAFF addon) browsers.
  • Viewing of EML files - EML is file format for saving emails. It is the default export email format of the Thunderbird email client. The show original email functionality in Gmail™ also exports the email in this format.
  • Readabilty mode - for easy reading of the text content, with support for serif and sans serif font, different font size and background colors.
  • Showing the creation date of the file
  • Opening the source url of a MHTML file
  • Finding text in the current file
  • File printing

Animation of the viewerMHTML extension

Used libraries

This extension thankfully relays on the following great project(s):


This extensions is packaged with any new version of TagSpaces

Source code

The source code of this extension is freely available on


If you want to extend this extensions, please follow our general extension development guide



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