Generate up to 10,000 UUIDs at once using the browser’s cryptographically secure random generator, in version 4 (random) or version 7 (Unix-time ordered, ideal for database keys), with formatting options. Create universally unique identifiers in bulk: random v4 or sortable v7.
What does this tool do?
Generates version-4 UUIDs (e.g. 550e8400-e29b-41d4-a716-446655440000) — one at a time or in bulk — using cryptographic randomness. Copy individually or grab the whole batch.
The UUID Generator is also a teaching aid in disguise: clear error messages and instant feedback make abstract formats concrete. Paste a broken example and the tool does not just fail — it shows you exactly where and why, which is how formats get learned.
Using it is simple: the inputs are “How many”, “Version” and “UUIDs”; the “ver” control offers “v4 (random)” and “v7 (time-ordered)”; “Generate” runs the tool; “Copy all” grabs the result for pasting elsewhere; “Download” saves it as a file. Results update live as you work — there is no waiting and nothing to submit.
How do I use this tool?
Paste your input, adjust any options, and copy the result — the whole workflow is paste, glance, copy, with no waiting in between.
- Enter your values in “How many”, “Version”, “UUIDs”.
- Click “Generate” to run the tool and see the result.
- Use “Copy all” to grab the result for pasting elsewhere.
How does it work?
16 random bytes from crypto.getRandomValues() are formatted per RFC 4122 with the version (4) and variant bits set. With 122 random bits, collisions are for all practical purposes impossible — you would need to generate billions per second for a century.
The implementation follows the relevant specification or RFC for the format — the same rules your production systems use — so results here match results there. When specs leave choices open, the tool picks the common convention and labels it.
Use cases in Pakistan
Developers use UUIDs as database primary keys, order IDs, API idempotency keys and file names that must never collide — common in Pakistani software houses and freelance projects alike. Students meet them in database courses.
From Lahore’s software houses to freelance developers working with Gulf and Western clients, these small utilities punctuate every workday: checking a payload, generating a key, converting a format. They are the screwdrivers of the trade — unglamorous, indispensable, and used dozens of times daily.
Limitations
UUIDs are unique, not secret — do not use them as passwords or security tokens. They are long and ugly for humans; use shorter IDs (Nano ID) where people must read or type them.
Edge cases in specifications can surprise: when a result looks wrong, check the spec’s fine print (or the tool’s stated conventions) before blaming the tool. For production-critical work, verify against your own toolchain as well.
Frequently asked questions
What is a UUID?
A 128-bit Universally Unique Identifier, written as 32 hex digits in groups — e.g. 550e8400-e29b-41d4-a716-446655440000. Version 4 is randomly generated. When something looks wrong, test with the simplest possible input first — isolating the problem beats staring at a large payload.
Can two UUIDs collide?
Theoretically yes, practically never: 122 random bits make collisions vastly less likely than hardware failure. Keep the original input saved somewhere; transformations are one-way streets and re-running from scratch is easier than undoing.
UUID vs auto-increment ID?
UUIDs can be generated anywhere without coordination (great for distributed systems); auto-increment IDs are shorter and sortable but need a central counter. For production use, verify the output in your actual toolchain once — the browser and your server should agree, and it is worth confirming.
Are UUIDs secret?
No — uniqueness is not secrecy. Never use a UUID as an authentication token. When something looks wrong, test with the simplest possible input first — isolating the problem beats staring at a large payload.
Is my data uploaded or stored?
No. This tool runs entirely in your browser — what you type or paste never leaves your device, is never sent to a server, and is never stored. Closing the tab removes all trace. Keep the original input saved somewhere; transformations are one-way streets and re-running from scratch is easier than undoing.
Is it really free? Do I need an account?
Yes, free, and no account needed. Open the page and use it — no sign-up, no trial, no watermark on results. For production use, verify the output in your actual toolchain once — the browser and your server should agree, and it is worth confirming.
Updated October 2026 · Built and tested by Sharjeel Tahir · How our tools are tested