๐ UUID Generator
Generates UUID v1 (timestamp-based), v4 (random) and v7 (time-ordered) in bulk from the browser crypto random source - no sign-up, no API keys and no cap on how many you request. v4 is the safe default for opaque identifiers; v7 embeds a millisecond timestamp, which keeps database indexes from scattering. Every string is produced in your tab and nothing is transmitted.
- Versionsv1, v4, v7
- SourceBrowser crypto RNG
- BulkYes, no cap
- UploadNever - local
Which version belongs in your table
| Your situation | What this generator returns | Better move |
|---|---|---|
| Primary key for a new Postgres table | v7 starts with a millisecond timestamp, so new rows cluster | Choose v7 and store it as uuid, not as a padded string |
| Password reset or invite token | v4 draws 122 random bits with no time or machine hint | Choose v4; never use v1 or v7 for anything that must be unguessable |
| Rows must sort by creation time | v7 gives rough chronological order, v4 gives none | Use v7 plus a real created_at column when you need exact ordering |
| Recreating the same ID next week | Every run draws fresh randomness; there is no seed or stored machine ID | Save the value you generate - it cannot be reproduced later |
| Seeding a test fixture | Bulk output gives as many independent values as you request | Generate once and paste the block in; each run starts from a fresh draw |
| IDs that appear in a public URL | v1 exposes a timestamp and a node field | Pick v4 so the URL leaks nothing about when or where it was made |
โ๏ธ Options
๐ค Generated UUIDs (0)
UUID Generator: Generate UUIDs (GUIDs)
UUID Generator lets you generate uuids (guids). Upload settings and get UUID values โ all processed locally in your browser, with no uploads and no sign-up.
Generate unique IDs for databases
Generate unique IDs for databases. This is one of the most common reasons people reach for UUID Generator โ and it handles the job in seconds, entirely in your browser.
Create UUIDs for distributed systems
Create UUIDs for distributed systems. This is one of the most common reasons people reach for UUID Generator โ and it handles the job in seconds, entirely in your browser.
Produce test identifiers
Produce test identifiers. This is one of the most common reasons people reach for UUID Generator โ and it handles the job in seconds, entirely in your browser.
Everything You Need in a UUID Generator
Powerful features that make UUID Generator fast, private, and free.
Instant Processing
Conversion and validation happen as you type.
Developer-Grade
Built for accurate, standards-compliant results.
100% Private
All processing is local โ no data is sent anywhere.
Copy & Export
One-click copy to clipboard for quick use.
Free Forever
No sign-up, no API keys, no limits.
Regex & JSON Support
Full regular expression and JSON validation built in.
How to Use
Pick a UUID version
Choose v4 (random), v7 (time-ordered), or v1 (timestamp) depending on whether you need randomness or sortability.
Set the count and format
Choose how many UUIDs to generate and whether you want them uppercase, lowercase, or without hyphens.
Generate
The tool produces the UUIDs instantly in your browser.
Copy the results
Copy the generated IDs into your database, code, or configuration.
Detailed User Guide
Generate RFC 4122 UUIDs in several versions
Choose v4 for fully random IDs, v7 for time-ordered IDs that sort well in databases, or v1 for timestamp-based IDs that embed the creation time.
Version choice affects database performance
Random v4 IDs scatter across a database index, while time-ordered v7 IDs cluster better and can improve insert performance in large tables.
Format options fit your stack
Output uppercase, lowercase, or hyphen-free UUIDs to match your language's conventions โ hyphen-free is common for filenames and some systems.
Generated locally, not from a server
UUIDs are created in your browser, so they are genuinely unique and never depend on a third-party service.
Batch generation for seeds and fixtures
Generate many UUIDs at once to populate test fixtures, seed scripts, or bulk data imports.
Collision safety is practically guaranteed
Random v4 UUIDs have 122 bits of entropy, making collisions vanishingly unlikely even at massive scale. This is why they are the default for distributed systems.
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