An avatar URL is the cheapest way to make a seeded user list stop looking like a spreadsheet. All four providers here derive the image from a seed string, so the same user gets the same face on every rebuild of your fixtures.
What you can control
- Four providers with different looks: geometric identicons, generated illustrations, colour beams and plain initials.
- The seed is included as a column, so you can store it and regenerate the identical avatar later.
- Size is set through the URL, which means the provider does the resizing and your fixtures stay small.
- Optionally pair each URL with the name it was generated from, so initials-based avatars line up with your user records.
What this is not
These URLs point at third-party services. They are fine for local development and staging, but a production page that loads hundreds of them is making hundreds of external requests — download the images or self-host instead.
Questions
Do these images always look the same?
Yes, for a given seed. All four providers are deterministic: the seed goes in, the same image comes out, on any machine.
Can I use these in production?
Technically yes, but you would be depending on someone else's uptime and rate limits for every page view. Generate once, store the file, serve it yourself.
Which style works best for a user list?
Identicons and initials read most clearly at small sizes. The illustrated styles are better at 96px and above, where the detail is actually visible.