Super lightweight SVG identicon generator.
Generate identicons (pixelated avatars) on the client from usernames instead of fetching images from a server!
Play with the JavaScript version of Minidenticons here.
You will always get the same identicon for a given username. But it is not impossible to have different usernames with the same identicon. That's a collision.
Generated identicons are 5×5 pixels large with vertical symmetry, and can have 18 different hues for the same saturation and lightness. This means there are 2⁽³˟⁵⁾ × 18 = 589,824 different identicons possible, but actually much less because of the modulo-based algorithm used to get more colored pixels at the center of the identicon instead of having them scattered. So duplicate identicons are inevitable when using a lot of them. It shouldn’t matter as identicons should not be used solely to identify an user, and should always be coupled to a unique username 😉
Tests results below show that you have roughly a 7% chance to generate a duplicate identicon when already using 1000 of them.
0 collisions out of 100 (0.00%)
0 collisions out of 200 (0.00%)
2 collisions out of 300 (0.67%)
6 collisions out of 400 (1.50%)
11 collisions out of 500 (2.20%)
21 collisions out of 600 (3.50%)
38 collisions out of 700 (5.43%)
49 collisions out of 800 (6.13%)
55 collisions out of 900 (6.11%)
66 collisions out of 1000 (6.60%)
296 collisions out of 2000 (14.80%)
589 collisions out of 3000 (19.63%)
962 collisions out of 4000 (24.05%)
1441 collisions out of 5000 (28.82%)
1965 collisions out of 6000 (32.75%)
2564 collisions out of 7000 (36.63%)
3173 collisions out of 8000 (39.66%)
3860 collisions out of 9000 (42.89%)
4570 collisions out of 10000 (45.70%)