Are UUIDs generated in the browser cryptographically secure?

Yes. This tool uses the browser's Web Crypto API (crypto.getRandomValues()) to generate UUIDs — the same source of randomness used by cryptographic libraries. It is not Math.random(). The output is suitable for use as database primary keys, session tokens, idempotency keys, and other scenarios where collision resistance matters.

What UUID version should I use for database primary keys?

For most modern databases, UUID v7 is the best choice for primary keys. Its timestamp prefix means new records sort naturally by creation time, which significantly reduces index fragmentation compared to v4. If your database or ORM doesn't support v7 yet, v4 is still solid and universally supported. Avoid v1 for primary keys — embedding MAC address info in your identifiers is an unnecessary privacy leak.

Can I generate UUIDs in bulk for database seeding or test data?

Yes. Set the quantity field to however many UUIDs you need and click Generate. You can produce dozens at once, then copy the entire batch to your clipboard. The output is formatted one UUID per line, ready to paste into a seed file, fixture, or test suite without any reformatting.

Is a UUID the same as a GUID?

Essentially yes. GUID stands for Globally Unique Identifier — it's Microsoft's term for the same concept defined in the UUID RFC 4122 standard. The format is identical: 32 hexadecimal characters displayed in five groups separated by hyphens (xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx). In practice, UUIDs and GUIDs are interchangeable in most contexts.

⚡ Speed Up Workflow⚡ Workflow

UUID Generator

UUID Generator — Generate v1, v4, and v7 UUIDs Instantly.

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Directly Generate IDs for Your Stack

You need a UUID. Maybe it's a primary key for a new table, a correlation ID for a log event, or an idempotency key for an API call. Import friction is the enemy of developer workflow.

This generator runs entirely in your browser using the Web Crypto API — the same randomness source as cryptographic libraries. No data leaves your device, nothing is logged server-side, and there's no account to create.

Quick Overview

Generate UUID v4 for general-purpose random identifiers — the most widely supported version.
Generate UUID v7 for database primary keys — timestamp-prefixed for natural sort order.
Bulk generate up to 100 UUIDs at once for database seeding or test fixtures.
Runs 100% in the browser via the Web Crypto API — no server contact, no logging.
Copy a single UUID or the full batch to clipboard in one click — ready to paste.

Real-World Use Case

Arjun, a backend engineer, needs 40 v7 UUIDs for a SQL seed file to test a database migration. He sets the version to v7 for sort-friendly keys, hits Generate, copies the batch, and pastes it directly. Done in seconds without leaving the browser.

Private & Secure

All generation happens locally in your browser context. We do not store, track, or cross-reference any generated IDs, ensuring absolute privacy for your infrastructure secrets.

LOCAL ENTROPY PROTOCOL

Bulk Generation

Generate dozens of UUIDs at once for seeding or testing.

Web Crypto API

Uses cryptographically secure randomness, not Math.random().

Zero Server Contact

Runs entirely in JavaScript. No data is sent to any server.

v1, v4 & v7

Support for time-based, random, and time-ordered identifiers.

4-Step Workflow

CHOOSE VERSION

Select v1 (time), v4 (random), or v7 (timestamp-ordered random).

SET QUANTITY

Need one or one hundred? Bulk generation is instant and easy.

CLICK GENERATE

UUIDs are created immediately using secure Web Crypto API.

COPY & PASTE

Grab individual IDs or the entire batch with one click.

When to Use This Tool

Database Primary Keys

Use v7 for new tables to get globally unique IDs that sort naturally by insertion time for better index performance.

Test Data Seeding

Bulk-generate dozens of unique IDs to populate database seed files, fixtures, or mock data arrays for your test suites.

Trace & Correlation IDs

Grab a quick v4 UUID to use as a correlation ID when debugging distributed systems or manually injecting traces into logs.

Related Developer Tools

Hash Generator

Generate a hash instead of a UUID for deterministic identification.

JWT Decoder

Decode and inspect JWT tokens — natural adjacent tool for developers.

Lorem Ipsum

Generate placeholder text for mock data fixtures alongside your IDs.

Privacy Statement

All UUIDs are generated locally in your browser using the Web Crypto API. No UUIDs, inputs, or usage data are ever sent to or stored on any server.

Browser Compatibility

Works in all modern browsers — Chrome, Firefox, Safari, and Edge — with no extensions required.

FAQs

UUID v1 is generated using the current timestamp and your device's MAC address, making it time-sortable but potentially exposing hardware info. UUID v4 is completely random — 122 bits of randomness — and the most widely used version for general-purpose unique IDs. UUID v7 is newer: it's also random but uses a Unix timestamp prefix, making it lexicographically sortable. v7 is increasingly preferred for database primary keys because it indexes more efficiently than v4.

Data & Docs