RoboHash — Free Unique Robot Avatar Generator from Text (No Key)

TL;DR

RoboHash generates unique robot, monster, or alien avatar images from any input text using a deterministic hashing algorithm — the same text always produces the same avatar. Pass any string in the URL path (like a username or email) and optionally choose a style set (set1=robots, set2=monsters, set3=aliens) and image size. No API key, no server-side processing needed — just use the URL directly as an img src. The de facto standard for default user avatars, used by GitHub and many other platforms.

Quick start: https://robohash.org/test?set=set1

No API key needed — just make a request!

Robot avatar for "test": https://robohash.org/test?set=set1

Try This URL Now

How to Use This API

1. Basic Robot Avatar

Any text in the URL path generates a unique avatar:

https://robohash.org/username123?set=set1

2. Avatar Styles

Choose your set: set1 (robots), set2 (monsters), set3 (robot heads):

https://robohash.org/hello@example.com?set=set2
https://robohash.org/user42?set=set3

3. Custom Size

Append dimensions to the path:

https://robohash.org/myuser?set=set1&size=200x200

4. HTML — User Avatar

5. Python — Batch Avatar Download

import requests

users = ['alice', 'bob', 'charlie', 'diana']
for user in users:
    url = f'https://robohash.org/{user}?set=set1&size=100x100'
    img = requests.get(url)
    with open(f'avatar_{user}.png', 'wb') as f:
        f.write(img.content)
    print(f'Saved avatar for {user}')

Frequently Asked Questions

How are avatars generated?: RoboHash uses a hash of the input text to deterministically generate unique robot/monster/alien images. The same input always produces the same avatar, making it perfect for consistent user representations.
What image formats are supported?: PNG by default. You can get JPG by adding .jpg to the URL path, or SVG for scalable vector graphics.
Do I need an API key?: No. RoboHash is completely free and requires no authentication. The images are served directly via URL.
What are the different style sets?: Set1: full-body robots with various heads, arms, and accessories. Set2: cartoon monsters in bright colors. Set3: robot heads only (more compact). There's also set4 (kittens) and set5 (human-like).
Can I use these avatars in production?: Yes, RoboHash has been used in production by countless websites and applications for years, including as GitHub's default avatar fallback.
Are there rate limits?: No published rate limits. The service is lightweight and designed for high-volume avatar serving.

API Details

API URL: https://robohash.org/{text}
Documentation: robohash.org
Category: Development
Authentication: Not Required
Geographic Coverage: Global

What You Can Build

Default user avatars for new accounts that haven't uploaded a photo
Comment system avatars using email addresses as input
Anonymous forum icons that give each poster a unique robot identity
Chat application profile pictures that never show broken image placeholders
Game entity icons using monster set for NPCs and enemies