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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