Free UUID Generator Online

Generate up to 1,000 UUID v4, time-ordered UUID v7, ULID, Nano ID or random hex IDs per request. Secure randomness, optional uppercase.

Result

Press “Run” to see the result.

The UUID API generates unique identifiers in the formats modern applications use. type=v4 (default) returns random RFC 4122 UUIDs, v7 returns time-ordered UUIDs whose first 48 bits are a millisecond timestamp (great as database primary keys because they sort by creation time), ulid returns 26-character Crockford base32 ULIDs, nanoid returns URL-safe Nano IDs and hex returns random hexadecimal strings.

Use count to get from 1 to 1,000 IDs in one call, size (4–64, default 21) to choose the length of Nano ID and hex IDs, and uppercase=true for upper-case output. All values come from a cryptographically secure random generator.

The response is a small JSON object with the type, the count and the ids array – easy to use from scripts, seeders and CI jobs that need fresh identifiers.

Use this in your code

curl "https://apibox.io.vn/v1/uuid?type=v7&count=2" \
  -H "Authorization: Bearer YOUR_API_KEY"

const res = await fetch('https://apibox.io.vn/v1/uuid?type=v7&count=2', {
  method: 'GET',
  headers: {
    Authorization: 'Bearer YOUR_API_KEY',
  },
});
const data = await res.json();
console.log(data);

import requests

res = requests.get(
    "https://apibox.io.vn/v1/uuid?type=v7&count=2",
    headers={"Authorization": "Bearer YOUR_API_KEY"},
    timeout=30,
)
print(res.json())

<?php
$ch = curl_init('https://apibox.io.vn/v1/uuid?type=v7&count=2');
curl_setopt_array($ch, [
    CURLOPT_RETURNTRANSFER => true,
    CURLOPT_HTTPHEADER => ['Authorization: Bearer YOUR_API_KEY'],
]);
$response = curl_exec($ch);
print_r(json_decode($response, true));

API documentation → Get a free API key

FAQ

UUID v4 or UUID v7 – which should I use?

v4 is fully random. v7 starts with a timestamp, so new IDs sort after older ones; that keeps B-tree indexes compact and makes v7 a better choice for database primary keys.

How many UUIDs can I generate at once?

Up to 1,000 per request with count=1000. Each request counts as one call against your quota.

What is the difference between ULID and UUID v7?

Both are time-ordered and 128-bit. ULID is written as 26 base32 characters (e.g. 01J...), UUID v7 uses the standard 36-character hyphenated UUID format that databases have native types for.