UUID Generator

Generate random UUIDs (v4) or time-based UUIDs (v1). Free, instant, 100% private — all in your browser.

Batch:

About UUIDs

UUID (Universally Unique Identifier) is a 128-bit number used to uniquely identify information. Also called GUID (Globally Unique Identifier).

Versions

Version	Method	Use Case
v1	Time + MAC address	Sortable, traceable. Database primary keys.
v4	Random	Most common. IDs, tokens, filenames.
Nil	All zeros	Special sentinel value (00000000-0000-0000-0000-000000000000).

🔒 All UUIDs are generated in your browser. No network calls.

About UUID Generator

Generate random UUIDs (v4) and time-based UUIDs (v7). Create single IDs or bulk generate up to 100 at once. Copy in multiple formats. Uses crypto.getRandomValues() for secure randomness. All in your browser.

UUID v4 & v7

Random UUID v4 for general use. Time-sortable UUID v7 for databases — better index performance.

Bulk Generation

Generate up to 100 UUIDs at once. Copy all, download as text, or pick with one click.

Multiple Formats

Standard (with dashes), no-dash (compact), uppercase, and URN format. Copy in your preferred style.

Cryptographically Secure

Uses crypto.getRandomValues() — not Math.random(). Production-quality unique identifiers.

📋 Common Use Cases

Creating Database Primary Keys

Generate unique UUIDs for database primary key columns in distributed systems where auto-increment IDs aren't feasible.

Assigning API Resource Identifiers

Produce collision-resistant resource IDs for RESTful APIs so every endpoint and entity has a globally unique reference.

Generating Bulk IDs for Data Seeding

Create hundreds of UUIDs at once for seeding test databases or populating mock data during development.

Tracking Events in Analytics

Assign a unique ID to each page visit or user action in an event tracking system to deduplicate analytics records.

🪜 How to Use This Tool

Choose UUID version
Select UUID v4 for random identifiers or UUID v7 for time-ordered IDs that sort chronologically.

Pick output format
Choose lowercase, uppercase, or no-dash formatting depending on your application's conventions.

Set the quantity
Adjust how many UUIDs to generate at once — from a single ID up to hundreds for bulk operations.

Copy all generated IDs
Click to copy all generated UUIDs to your clipboard, formatted as a list or comma-separated values.

Frequently Asked Questions

Are these dev tools free?▼

Yes. All dev tools are completely free. No signup, no account.

Is my data sent to a server?▼

No. Base64 encoding, URL encoding, JWT decoding, hash generation, and regex testing all happen in your browser. Your tokens and secrets stay on your device.

Can I decode JWTs safely?▼

Yes. JWT decoding happens entirely in your browser. The token never leaves your device. Only the header and payload are decoded — signatures are not verified server-side.