MHTML
| Filename extension | .mht, .mhtml |
|---|---|
| Internet media type | multipart/related application/x-mimearchive |
| Type of format | Markup language |
| Extended from | HTML |
| Standard(s) | RFC 2557 (proposed 1999) |
MHTML, short for MIME HTML, is a web page archive format used to combine resources that are typically represented by external links (such as images, Flash animations, Java applets, audio files) together with HTML code into a single file. The content of an MHTML file is encoded as if it were an HTML e-mail message, using the MIME type multipart/related. The first part 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 suffix .mht given to such files by default when created by Microsoft Word, Internet Explorer, or Opera. MHTML is a proposed standard, circulated in a revised edition in 1999 as RFC 2557.
Browser support
 |
This section relies on references to primary sources. (August 2011) |
Some browsers support the MHTML format, either directly or through third-party extensions, but the process for saving a web page along with its resources as an MHTML file is not standardized. Due to this, a web page saved as an MHTML file using one browser may render differently on another.
Internet Explorer
Microsoft Internet Explorer, as of version 5.0, was the first browser to support reading and saving web pages and external resources to a single MHTML file.
Opera
Support for saving web pages as MHTML files was made available in the Opera 9.0 web browser.[1] Beginning with Opera 9.50, the default format for saving pages is MHTML.
Firefox
Mozilla Firefox requires an extension to be installed to read and write MHT files. Many such extensions are freely available, two of which are the Mozilla Archive Format and UnMHT.
Although Firefox does not currently (as of version 19.0.2) include support for MHTML without the use of add-ons, there is source code available for viewing MHTML files within the related Thunderbird project, indicating that future support in Mozilla software such as Firefox may become available without such add-ons.
Safari
As of version 3.1.1 onwards, Apple Inc.'s Safari web browser does not natively support the MHTML format. Instead, Safari supports the webarchive format, and the OS X version includes a print-to-PDF feature.
As with most other modern web browsers, support for MHTML files can be added to Safari via various third-party extensions.
Konqueror
As of version 3.5.7, KDE's Konqueror web browser does not support MHTML files. An extension project, mhtconv, can be used to allow saving and viewing of MHTML files.
ACCESS NetFront
NetFront 3.4 (on devices such as the Sony Ericsson K850) can view and save MHTML files.
Google Chrome
Creating MHTML files in current versions of Google Chrome (25.0) is supported by toggling the "Save Page as MHTML" option on the "chrome://flags" page. However, enabling this experimental option disables the options to save pages as HTML-only or HTML Complete files.[2]
Viewing MHTML files in Chrome is not supported natively.
MHT Viewers
There are commercial software products for viewing MHTML files and converting them to other formats, such as PDF.
See also
- Mozilla Archive Format
- Webarchive
- An alternative for attaching resources to an HTML document is the data URI scheme defined in IETF standard RFC 2397.
References
- ^ Santambrogio, Claudio (10. March 2006). "…and one more weekly!". Opera Software. Retrieved 2009-05-15.
- ^ How to save a web page as MHT in chrome?, superuser.com
External links
- MHTML standard explained
- RFC 2557 (1999) — MIME Encapsulation of Aggregate Documents, such as HTML (MHTML)
- RFC 2110 (1997, Obsolete) — MIME E-mail Encapsulation of Aggregate Documents, such as HTML (MHTML)
- MHT-rip — A program to view MHTML files on Linux
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