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.mht

Use caution

MHTML Web Archive

A single-file web page: HTML, images, and CSS bundled as a MIME multipart message. Born with Internet Explorer and still common in Chinese enterprise software and some government portals.

MIME types

  • message/rfc822
  • application/x-mimearchive
  • multipart/related

Category

web

Aliases

.mhtml

What opens this file

  • Internet Explorer (legacy)
  • Edge (IE mode)
  • Chrome (via flag)
  • Firefox + add-on

How to open by OS

Windows

  • Edge and Chrome open many MHT files; perfect fidelity needs IE.

Mac

  • Safari does not support MHT; Chrome is the usual fallback.

Linux

  • Chromium typically works.

Ios

  • Not supported.

Android

  • Chrome.

Safety notes

  • MHTML contains HTML and JavaScript — phishing campaigns use it to run malicious script offline. Inspect with a text editor before opening unknown files.
  • Legacy apps still rely on IE security zones for MHT, slowing full migration to modern browsers.

Common mistakes

  • Confusing MHT with Outlook's .eml. MHT captures a web page; EML captures a mail message plus attachments.
  • Chrome's Save page as MHTML is deprecated — prefer .webarchive, PDF, or print-to-PDF for long-term snapshots.

Related extensions

References