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Filename extension
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Welcome to the filename extension search engine

What is the filename extension?

The filename extension is a group of characters that stand at the end of a filename after a period, that define which program can be used to open the file. For example, from the EXAMPLE.SWF filename, SWF is the extension that shows that it’s a Shockwave Flash file.

How to use our search engine

To search for an extension, type the filename extension you’re looking for into the search field above, then click on the magnifying glass icon beside it.

Help our work

If you created a new filename extension as a developer, or if you have useful information about an extension that hasn’t been registered by us yet, then contact us at our address.

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