What is /9j/4AAQSkZJRgABAQ?
Base64 JPEG prefix
/9j/4AAQSkZJRgABAQAAAQABAAD/2wBDAAgGBgcGBQgHBwcJCQgKDBQNDAsLDBkSEw8UHRofHh0aHBwgJC4nICIsIxwcKDcpLDAxNDQ0Hyc5PTgyPC4zNDL/
| Decoded type | JPEG image (image/jpeg) |
|---|---|
| Decoded size | 90 B |
| Base64 length | 120 characters |
FF D8 FF E0 00 10 4A 46 49 46 00 01 01 00 00 01 00 01 00 00 FF DB 00 43 00 08 06 06 07 06 05 08 07 07 07 09 09 08 0A 0C 14 0D 0C 0B 0B 0C 19 12 13 0F 14 1D 1A 1F 1E 1D 1A 1C 1C 20 24 2E 27 20 22 2C 23 1C 1C 28 37 29 2C 30 31 34 34 34 1F 27 39 3D 38 32 3C 2E 33 34 32 FF
Explanation
A Base64 string that begins with /9j/ is a JPEG image, because /9j/ encodes the bytes FF D8 FF (the JPEG "start of image" marker).
/9j/4AAQSkZJRg means the file uses the JFIF container, and /9j/4QA or /9j/4RE indicates EXIF metadata from a camera or phone. Decode the full string with Base64 to JPG.
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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