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Web page archive
File type: Internet related file
Files with mhtml extension can be found as special archived web pages saved in MIME MHTML format.
File type category:
Internet related file
Date updated: April 23, 2026
The mhtml file extension is used for a files in special MHTML format.
Short for MIME HTML, it is a web page archive format used to bind resources which are typically represented by external links (such as images, Flash animations, Java applets, audio files) together with HTML code into a single file. The first of the file is normally encoded HTML, subsequent parts are additional resources identified by their original URLs and encoded in base64. This format is sometimes referred to as MHT, after the file extension MHT given to such files by default when created by Microsoft Word, Internet Explorer, Opera or Firefox.
MIME types:
multipart/related
message/rfc822
application/mime
Use Microsoft Office Word 2002 or higher or Internet Explorer, Firefox, Opera.
Some programs can process or convert MHTML files to other source files.
Software applications that can open mhtml files:
Microsoft Windows
Apple macOS / Mac OS X
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