UUID Generator
Generate random v4 or timestamp-ordered v7 UUIDs in your browser, 1 to 1000 at a time, using the cryptographic random source. Free.
About this tool
Generate universally unique identifiers on demand. Enter how many you need (up to 1000) and get one UUID per line, produced with the browser's cryptographic random source. Version 4 (fully random) is the default; set the option to 7 for timestamp-ordered UUIDs.
Version 7 puts a millisecond timestamp in the high bits, so IDs generated over time sort chronologically, which makes them noticeably friendlier to database indexes than v4's random scatter. For anything user-facing or security-adjacent, v4's full randomness remains the safe default.
Common uses
- Fill fixtures, seeds, and test data with valid unique IDs.
- Grab a fresh ID for a config file, correlation header, or API key name.
- Generate sortable v7 IDs to evaluate them for a new database schema.
Automate via API
The same conversion is available as a REST endpoint for scripts, pipelines, and backends:
curl -X POST https://payloadly.com/api/v1/tools/uuid-generator \ -H "Content-Type: text/plain" \ -H "X-Api-Key: YOUR_API_KEY" \ --data-binary @input.txt
Frequently asked questions
Is my data uploaded to a server?
No. This tool runs entirely in your browser using JavaScript, and there are no ads on the page. Nothing you paste or drop here is uploaded, logged, or stored, and you can verify that yourself: open your browser's developer tools and watch the Network tab while you convert (no requests leave the page), or disconnect from the internet after the page loads and keep working.
Is a GUID the same as a UUID?
Yes. GUID (globally unique identifier) is Microsoft's name for the same 128-bit format, and .NET's Guid.NewGuid() produces a standard version 4 UUID. Anything this page generates is valid wherever a GUID is expected, including SQL Server uniqueidentifier columns.
Can two generated UUIDs ever collide?
A v4 UUID has 122 random bits, so you would need to generate about 2.7 quintillion of them to reach even a 50% chance of one collision. For practical purposes, treat them as unique; real-world collisions come from broken generators or copy-paste, not from chance.
When should I prefer v7 over v4?
Use v7 for database primary keys and event IDs where insert order matters: the leading timestamp keeps B-tree indexes compact and range scans cheap. Use v4 when IDs must not leak creation time or when you simply need maximum entropy.
Is there a size limit or a fee?
The browser tool is free with no signup and comfortably handles files up to tens of megabytes (limited by your device's memory). For automated or bulk processing inside your own scripts and pipelines, use the paid REST API.
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