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Last active October 31, 2024 00:27
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List of file signatures and mime types based on file extensions
Raw
README.md

About

This file was generated automatically based on this two sources:

  1. /etc/nginx/mime.types
  2. http://www.garykessler.net/library/file_sigs.html

File format

This is a JSON object by following structure:

[string ext] : {
  signs: [sign]
  mime: string
}

A sign is a string in this format (without any space):

[int o],[hex s]

where o is x byte offset (Commonly zero)

Example Sign

MP4:

[4 byte offset]
66 74 79 70 69 73 6F 6D

becomes:

4,6674797069736F6D
Raw
extensions.json
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},
"flv": {
"signs": [
"0,00000020667479704D345620",
"0,464C5601"
],
"mime": "video/x-flv"
},
"mkv": {
"signs": [
"0,1A45DFA3"
],
"mime": "video/x-matroska"
},
"asx": {
"signs": [
"0,3C"
],
"mime": "video/x-ms-asf"
},
"wmv": {
"signs": [
"0,3026B2758E66CF11A6D900AA0062CE6C"
],
"mime": "video/x-ms-wmv"
},
"avi": {
"signs": [
"0,52494646"
],
"mime": "video/x-msvideo"
}
}
@Benzolio
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Hey! This is cool! I was about to start putting something like this together based on https://en.wikipedia.org/wiki/List_of_file_signatures. I did notice there are some more signatures on the wikipedia article that are not on https://www.garykessler.net/library/file_sigs.html
For example, two alternative signatures for mp3 of FF F2 and FF F3, so I think "mp3" could be extended to:

    "mp3": {
        "signs": [
            "0,494433",
            "0,FFFB",
            "0,FFF2",
            "0,FFF3"
        ],
        "mime": "audio/mpeg"
    },

Thanks for cross-referencing these!

@jgladen
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jgladen commented Jul 5, 2022

for eml I have also found: "Return-path: " in addition to "Return-Path: "

   "eml": {
        "signs": [
            "0,46726F6D3A20",
            "0,52657475726E2D506174683A20",
            "0,52657475726E2D706174683A20",
            "0,582D"
        ],
        "mime": "message/rfc822"
    },

@nvzavi
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nvzavi commented Sep 22, 2022 •
edited
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Thanks. This is really cool. I am also using this in my project now. I will credit you in my code and readme.md - link to this gist. Thanks again

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