What is a MHTML file

Contrary to ordinary website files such as HTML or HTM files, MHTML files are archives. In these archives, all contents of a website are stored. This includes the HTML as well as other resources needed to display the webpage, such as Javascript, CSS, audio, video, and image files. Usually, the only ones using this kind of format are web developers. They use the MHTML format to save the current state of their webpage, usually to archive them instead of for further usage. CAREFUL: if you receive an MHTML file via e-mail, make sure to thoroughly check it. These files are often used to distribute viruses and malware!

MHTML files are typically created by web browsers. The basis is an HTML file which is then encoded using the MIME encoding method. Most common web browsers can open MHTML files, such as Firefox, Chrome, Opera, Internet Explorer, and even the mobile web browser UC Browser. You don't have to be online in order to open MHTML files, the browsers can open them even if you are not connected to the internet. Since MHTML files are not uniformly formatted, they may look different in different browsers.

Here's a small, but not exhaustive list of programs that can open MHTML documents:

  • Google Chrome (Windows, Mac & Linux)
  • Kingsoft Writer (Windows)
  • Microsoft Internet Explorer (Windows)
  • Microsoft Word (Wondows & Mac)
  • Mozilla Firefox (Windows & Mac)
  • Opera (Windows, Mac, Linux, Android & iOS)
  • Terra Informatics BlockNote.Net (Windows)
  • UCWeb UC Browser (Android, iOS, Windows Phone)
  • WizBrother WizHtmlEditor (Windows)
Extension MHTML
MIME type multipart/related, application/x-mimearchive, message/rfc822
Useful links