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Convert HTM to MHT

Verified by Adam B.· reviewed by FE Editorial ·updated Sep 6, 2026
QUICK ANSWER
Is it possible to convert HTM to MHT?
Yes - HTM converts to MHT.

Open the .htm file in Microsoft Edge, press Ctrl+S, and choose Webpage, Single File (*.mhtml) from the format dropdown. The file bundles HTML, images, and CSS into one portable archive. Dynamic JavaScript content is frozen at the moment of saving.

Also to MHT: WHTML · WEBARCHIVE · HTML

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Tested on macOS, Windows & Linux
Last verified Nov 2026

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Why convert HTM to MHT?

An HTM page saved with Save Page As (Complete) produces a main file plus a folder of loose assets that break easily when moved or emailed. MHTML (defined in RFC 2557 and popularized by Internet Explorer 5) collapses everything into one .mht archive, eliminating broken resource paths and making the page portable as a single attachment.

About these formats

.HTM HTML Web Page (8.3 "htm" spelling of html)

A .htm file is an HTML web page, exactly the same as an .html file. The difference is purely historical - old DOS and Windows systems only allowed three-character extensions, so pages were…

Open .HTM details →
.MHT MIME HTML Web Archive (MHTML)

An MHT (MHTML) file is a complete web page - the HTML, images, CSS, and scripts - bundled into one file using the same MIME packaging email uses. Open it by dragging it into Microsoft Edge…

Open .MHT details →

Quality & what to watch

  • Images are embedded as Base64 data, inflating binary assets by roughly 33% compared to the original folder-based save.
  • Dynamic JavaScript content (carousels, live data, maps) is frozen at save time and will not update when the .mht is reopened offline.
  • Firefox has no native MHT save or open support; use Chrome or Edge for this conversion.

Frequently asked questions

Can I rename a .mhtml file to .mht?
Yes - .mht and .mhtml are the same format and open identically in Edge and Chrome.
Will the saved .mht look the same as the original page?
Yes for static content; JavaScript-driven elements such as live feeds or maps appear as they were at save time.
Can Firefox open .mht files?
No - Firefox does not support MHT natively; use Chrome or Edge to open .mht files.