What is iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAA…?

1×1 transparent PNG

iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVR42mNkYPhfDwAChwGA60e6kgAAAABJRU5ErkJggg==
Decoded typePNG image (image/png)
Decoded size70 B
Base64 length96 characters
Decoded 1×1 transparent PNG
89 50 4E 47 0D 0A 1A 0A 00 00 00 0D 49 48 44 52
00 00 00 01 00 00 00 01 08 06 00 00 00 1F 15 C4
89 00 00 00 0D 49 44 41 54 78 DA 63 64 60 F8 5F
0F 00 02 87 01 80 EB 47 BA 92 00 00 00 00 49 45
4E 44 AE 42 60 82

Explanation

Every PNG encoded to Base64 begins with iVBORw0KGgo, the encoded form of the 8-byte PNG signature 89 50 4E 47 0D 0A 1A 0A.

This particular value is a minimal 1×1 PNG. Developers use it as an image placeholder in unit tests, in CSS and in API mocks because it is a valid image that every library can open.

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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