.HTM File Extension

Hypertext Markup Language File

Developer WHATWG
3.8  |  262 Votes
Category Web Files
Format Text

What is an HTM file?

An HTM file is an HTML webpage used by web browsers, such as Google Chrome, Microsoft Edge, and Mozilla Firefox. It may contain hyperlinks and markup language, which defines the elements and layout of a webpage.

More Information
Screenshot of a .htm file in Microsoft Visual Studio Code 1
HTM file open in Microsoft Visual Studio Code 1

Unless you are a web developer, you will most likely never need to open an HTM file since the HTML in the file is parsed by your web browser. If you want to view the HTML of a webpage, select View Source from the View menu in your web browser (View → Developer → View Source in Chrome).

HTM files can also be opened using a basic text editor since the file is saved in a plain text format. However, a source code editor should be used to modify HTM files because they come with helpful coding features.

HTM files serve the exact same purpose as .HTML files, but are much less common. The .htm extension arose with the use of Microsoft web development software, such as FrontPage, SharePoint Designer, and Expression Web.

Open and view .HTM files with File Viewer Plus.Free Download

Programs that open or reference HTM files

Updated April 25, 2019

Verified by FileInfo.com

The FileInfo.com team has independently researched the Hypertext Markup Language file format and Mac, Windows, Linux, and Android apps listed on this page. Our goal is 100% accuracy and we only publish information about file types that we have verified.

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