UUID Generator (v4, v7, v1, ULID, NanoID)
Generate UUIDs, ULIDs and NanoIDs in bulk — cryptographically secure and 100% in your browser.
Random — the most common, max compatibility.
About UUID Generator (v4, v7, v1, ULID, NanoID)
Generate unique identifiers instantly: choose UUID v4 (random), v7 (timestamp-ordered), v1 (legacy time-based), ULID or NanoID, set how many you need (up to 1,000), and they appear immediately. Use the formatting options to switch to uppercase, strip the hyphens or wrap each value in braces, then copy them all or download as TXT, JSON or CSV.
Every value is produced with the browser's cryptographically secure random generator (crypto.getRandomValues), never Math.random, so the IDs are unguessable. Generation happens entirely on your device — nothing is sent to a server.
Not sure which to pick? UUID v4 is the safe default with the widest compatibility. UUID v7 and ULID embed a timestamp so they sort by creation time, which keeps database indexes efficient — a great choice for primary keys. NanoID is shorter and URL-safe, handy for public-facing IDs and short links.
UUID v4
Type: UUID v4 · Quantity: 3
f47ac10b-58cc-4372-a567-0e02b2c3d479 9b2e4f1a-3c6d-4e8b-9a1f-2d7c5b8e0a31 7c9e6679-7425-40de-944b-e07fc1f90ae7
Switch to v7 or ULID for time-sortable IDs, or NanoID for short URL-safe ones.
Frequently asked questions
Are these UUIDs safe to use / truly random?
Yes. They're generated with crypto.getRandomValues, the browser's cryptographically secure random source, so v4 UUIDs have 122 bits of randomness and are effectively impossible to guess or collide.
What's the difference between UUID v4 and v7?
v4 is fully random. v7 starts with a 48-bit millisecond timestamp followed by random bits, so v7 IDs sort in creation order — better for database primary keys because new rows are appended to the end of the index instead of fragmenting it.
What are ULID and NanoID?
ULID is a 26-character, timestamp-sortable, case-insensitive ID using Crockford base32. NanoID is a compact, URL-safe random ID (default 21 characters) often used for short links and public identifiers.
Is my data uploaded anywhere?
No. All IDs are generated locally in your browser; nothing is transmitted or stored on a server.
Can I generate many at once?
Yes — up to 1,000 per batch. Copy them all to the clipboard or export them as TXT, JSON or CSV.