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Editorial Team
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Asked: 2026-06-02T16:32:00+00:00

I am able to get most file MIME types by checking the file in

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I am able to get most file MIME types by checking the file in a HTML file element, however when choosing a .tgz file I do not get a type.

Here is a jsfiddle showing the file type when a file is selected from the HTML file input: http://jsfiddle.net/chrisabrams/cTJKf/

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  1. Editorial Team

    According to the spec it’s up to the browser to attempt to determine the content-type and if it fails, it should return an empty string.

    type

    The ASCII-encoded string in lower case representing the media type of
    the Blob, expressed as an RFC2046 MIME type [RFC2046]. On getting,
    conforming user agents MUST return the MIME type of the Blob, if it is
    known. If conforming user agents cannot determine the media type of
    the Blob, they MUST return the empty string.     A string is a valid MIME
    type if it matches the media-type token defined in section 3.7 “Media
    Types” of RFC 2616 [HTTP].

    So whatever browser you’re using doesn’t recognise what a .tgz file is – this could vary both per-browser and also per-operating-system however.

    I’m using Opera on Linux and it recognises .tgz but – for example – doesn’t recognise .xcf

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