UUIDTools — Free UUID Generation API (v1, v4, v7, No Key)

TL;DR

UUIDTools provides a simple REST API for generating UUIDs (Universally Unique Identifiers) in versions 1, 3, 4, 5, 6, 7, and 8. Just hit the endpoint and get a clean JSON response with your UUID. Perfect for generating unique IDs for database records, user sessions, transaction IDs, or any system that needs collision-resistant identifiers. No signup, no rate limits.

Quick start: https://www.uuidtools.com/api/generate/v1

No API key needed — just make a request!

How to Use This API

1. Generate a v1 UUID (Timestamp-based)

UUID v1 uses the current timestamp and MAC address:

https://www.uuidtools.com/api/generate/v1

Response: ["c0a8a0b0-1a2b-11ec-8d3d-0242ac130003"]

2. Generate a v4 UUID (Random)

UUID v4 is fully random — most common for general use:

https://www.uuidtools.com/api/generate/v4

3. Generate v7 UUID (Time-ordered + Random)

UUID v7 combines a Unix timestamp with random bits, sortable by time:

https://www.uuidtools.com/api/generate/v7

4. Generate Multiple UUIDs at Once

Append a count to generate many at once:

https://www.uuidtools.com/api/generate/v4/count/10

Returns an array of 10 UUIDs in a single request.

5. JavaScript — Generate and Use a UUID

async function generateUUID(version = 4) {
  const resp = await fetch(`https://www.uuidtools.com/api/generate/v${version}`);
  const [uuid] = await resp.json();
  return uuid;
}

generateUUID(4).then(id => console.log('New ID:', id));
// e.g., "e3b0c442-98fc-1c14-9a7a-3f0a0a0a0a0a"

6. Python — Batch UUID Generation

import requests

# Generate 5 v4 UUIDs
resp = requests.get('https://www.uuidtools.com/api/generate/v4/count/5')
uuids = resp.json()  # returns a list
for uuid in uuids:
    print(uuid)

# Generate a v1 UUID
v1 = requests.get('https://www.uuidtools.com/api/generate/v1').json()[0]
print(f"v1 (time-based): {v1}")

Try generating a v1 UUID: https://www.uuidtools.com/api/generate/v1

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Frequently Asked Questions

Which UUID version should I use?: v4 (random) is the most common — suitable for database IDs, session tokens, and filenames. v1 (time-based) is good for distributed systems where IDs should be sortable by creation time. v7 (time-ordered) is the modern choice for database primary keys with time-based sorting and random distribution.
Can I generate UUIDs in bulk?: Yes! Append /count/{n} to generate up to 1000 UUIDs in a single request. For example, /api/generate/v4/count/100 returns 100 random UUIDs.
Does this work for UUID v3 and v5 (namespace-based)?: Yes, but v3 and v5 require a namespace and name. Use /api/generate/v3/namespace/{namespace}/name/{name} format. Check the UUIDTools documentation for namespace URL formats.
Is the API rate limited?: UUIDTools doesn't publish strict rate limits, but reasonable use is expected. It's designed for developer tools and CI/CD pipelines where you need ephemeral IDs.
What format does the response use?: Always JSON. The response is an array of UUID strings, even for a single UUID: ["uuid-string-here"]. HTTP status code is 200 on success.
What's the difference between UUID v6, v7, and v8?: v6 is a reordered v1 for better database indexing. v7 is time-ordered with random bits (RFC 9562). v8 is experimental/vendor-specific. All are supported by UUIDTools for testing and development.

API Details

API URL: https://www.uuidtools.com/api/generate/{version}
Documentation: www.uuidtools.com
Category: Utility
Authentication: Not Required
Geographic Coverage: Global

What You Can Build

CI/CD pipeline that generates unique build identifiers
Database migration tool that creates UUID primary keys
Session token generator for web applications
Test data factory that populates UUID fields for integration tests
Distributed tracing system where spans need unique, sortable IDs