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.KML File Extension

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Keyhole Markup Language File Icon
File Type
This file is saved in an XML format.
You can view the XML structure and contents of the file in a text editor.
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Keyhole Markup Language File
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CategoryGIS Files
File Format Description

Stores geographic modeling information in XML format; includes points, lines, polygons, and images; used to identify and label locations, create different camera angles, overlay textures, and add HTML content.

KML files were originally used by Keyhole mapping software developed by Keyhole, Inc. The company was acquired by Google in 2004 and KML files are now used by used by Google Earth and other Earth browser programs.

NOTE: You can open a KML file in Google Maps by hosting it on an online location and then typing the URL in the Google Maps search box. For example, if you host your KML file at, then type this URL in the Google Maps search box to display it.

Alternatively, you can construct the URL yourself in Google Maps by prefixing your KML file's URL with For example, to open the same KML file from above, you can use the following URL:

This procedure also works for Google Earth, the 3D earth-browsing plug-in you can add to your Web browser.

Program(s) that open .KML files
Updated 1/12/2015