How to Use UUID Generator: Complete Guide (2026)

What is UUID Generator?

UUID (Universally Unique Identifier) generators create random 128-bit IDs, typically version 4 (random). Developers use them as primary keys in databases, session tokens, file names, and distributed systems where collision-free IDs are required.

Generate UUID v4, UUID v7, ULID, or NanoID in your browser. Create one or many IDs for databases, APIs, and testing - nothing is uploaded.

Why use UUID Generator?

• Generate standards-compliant UUID v4 instantly
• Create multiple IDs for batch testing
• No server round-trip - runs in your browser
• Copy IDs with one click for APIs and configs

How to use UUID Generator - step by step

1. Step 1: Choose a format: UUID v4, UUID v7, ULID, or NanoID.
2. Step 2: Set how many IDs to generate (and NanoID length if needed).
3. Step 3: Click Generate, then copy one ID or use Copy All for bulk seeds and tests.

The UUID Generator lives under Developer Tools. Open the tool page, enter your input in the main field, and results update instantly. Use the copy button to paste output into documents, code editors, or spreadsheets.

Common use cases

Database primary keys

Use UUIDs instead of auto-increment integers in microservices.

API testing

Generate unique request IDs in Postman or curl scripts.

Examples

• Single UUID v4: 550e8400-e29b-41d4-a716-446655440000
• UUID v7 (time-sortable): 0191e6b5-8c3a-7c2d-8f1a-2b3c4d5e6f70 - first 48 bits are Unix ms, so newer IDs sort after older ones.
• ULID: 01ARZ3NDEKTSV4RRFFQ69G5FAV - 26 Crockford Base32 characters, also time-sortable.
• NanoID: V1StGXR8_Z5jdHi6B-myT - default 21 URL-safe characters (A-Z, a-z, 0-9, _ -).

Pro tips

• Use crypto.randomUUID() in production code when available.
• Never use Math.random()-based UUIDs for security-sensitive tokens.

Frequently asked questions

What is a UUID generator?

It creates unique identifiers - UUID v4 or v7 (128-bit values in 8-4-4-4-12 hex), plus optional ULID and NanoID - for database IDs, API keys, and session tokens.

What is the difference between UUID v4 and UUID v7?

UUID v4 is mostly random (122 random bits). UUID v7 (RFC 9562) puts a Unix millisecond timestamp in the first 48 bits, then random bits, so IDs roughly sort by creation time - helpful for B-tree indexes and log correlation. Both keep the same dashed hex layout.

What are ULID and NanoID?

ULID is a 26-character Crockford Base32 id with a millisecond timestamp plus randomness - sortable like UUID v7 but shorter. NanoID is a compact URL-safe random string (default 21 characters from A-Z, a-z, 0-9, _ -). Neither uses the UUID hyphenated hex format.

Is UUID the same as GUID?

In practice yes for random v4 values. Microsoft often says GUID; the format matches. Read more in UUID vs GUID.

Are UUIDs unique?

UUID v4 uses 122 random bits. UUID v7 combines a timestamp with random bits. Collision risk is negligible for normal apps. You would need absurd generation rates for a realistic collision.

Is this cryptographically secure?

Where available, UUID v4 uses crypto.randomUUID(). UUID v7, ULID, and NanoID use crypto.getRandomValues when available. Prefer those APIs in production. Never use Math.random()-based IDs for security-sensitive tokens - use a backend crypto library instead.

Can I generate IDs in bulk?

Yes. Set a count (up to 50) and use Copy All to paste the list into code or a spreadsheet.

Related tools you might need

Explore other developer tools on ToolsMinify. Related utilities are linked on the UUID Generator page to help you complete your workflow without leaving the site.