What's the difference between UUID v4 and v7?

UUID v4 is fully random, while UUID v7 embeds a timestamp so IDs generated later sort after earlier ones — useful for database primary keys where insertion order matters.

Are these UUIDs actually random and safe to use?

Yes. Random UUIDs use crypto.getRandomValues(), the same secure randomness source browsers use for cryptographic keys, not Math.random().

Can I generate deterministic IDs from a name?

Yes — UUID v3 (MD5-based) and v5 (SHA-1-based) generate the same UUID every time for the same namespace and name, useful for stable IDs derived from existing data.

How many IDs can I generate at once?

Up to 10,000 per batch, which can then be exported as SQL, JSON, CSV or a TypeScript array.

ToolMano

UUID / ID generator

Generate UUIDs, ULIDs, NanoIDs and other unique identifiers.

No uploadNo signupWorks offline

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Press Generate to create IDs.

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About uuid / id generator

UUID / ID generator creates version 1, 3, 4, 5 and 7 UUIDs, plus ULIDs, NanoIDs, short Base58/Base62 IDs, sequential counters and custom patterns, all using cryptographically secure randomness from the Web Crypto API.

It can generate up to 10,000 IDs at once and export them as a plain list, SQL insert statement, JSON array, CSV or a TypeScript constant, with formatting controls for case, braces, quotes, prefixes and separators, plus a built-in validator that detects a pasted UUID's version and variant.

All generation happens in your browser, so IDs used for internal systems or as database seeds are never sent anywhere.

How to use UUID / ID generator

1Pick a version or ID type and how many to generate.
2Press Generate to create the batch.
3Choose an output wrapper (plain list, SQL, JSON, CSV or TypeScript) and copy or download the result.

What it does

UUID v1, v3, v4, v5, v7, nil and max UUIDs
ULID, NanoID, short Base58/Base62 IDs
Sequential counters and custom X-based patterns
Batch generation of up to 10,000 IDs
SQL insert, JSON, CSV and TypeScript export formats
Custom prefix, suffix, casing, braces and quotes
Built-in UUID version/variant validator
Cryptographically secure randomness (Web Crypto)

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