What is AAAAIGZ0eXBpc29t?

Base64 MP4 video prefix

AAAAIGZ0eXBpc29tAAACAGlzb21pc28yYXZjMW1wNDE=
Decoded typeMP4 video (video/mp4)
Decoded size32 B
Base64 length44 characters
00 00 00 20 66 74 79 70 69 73 6F 6D 00 00 02 00
69 73 6F 6D 69 73 6F 32 61 76 63 31 6D 70 34 31

Explanation

MP4, MOV and M4A files start with an ftyp box. AAAAIGZ0eXBpc29t decodes to the size of the first box (32 bytes) followed by ftypisom, the most common MP4 brand.

You will often find it inside data:video/mp4;base64,AAAAIGZ0eXA… URIs in HTML and JSON. Paste the complete value into the Base64 to Video decoder to watch it.

You can decode any similar value yourself with the Base64 decoder, or identify a file from its first characters with the Base64 to File converter.

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