DevToolMage

Identifiers

UUID Generator

Create random UUID v4 values or time-ordered UUID v7 values. This is an identifier tool, not a generic random-number toy.

Input is processed in your browser. DevToolMage does not upload it, store it, or send it to analytics.

Version

First ID looks like version 4. These are identifiers, not passwords.

How it works

v4 uses crypto.randomUUID when available. v7 packs a 48-bit timestamp plus random bits and sets version and variant bits.

Input and output

Input is version and count. Output is one or more canonical UUID strings.

Examples

Test fixtures

Generate a handful of v4 IDs for seed data.

Time-ordered keys

Use v7 when insertion order in a list or index matters.

How to use this tool

  1. Choose v4 or v7.
  2. Set how many IDs you need.
  3. Copy one ID or the full list.

Limitations

  • Does not generate v1, v3, v5, or NIL as a primary workflow.
  • Bulk generation is capped.
  • Not a password or token generator.

Questions

What is the difference between v4 and v7?

v4 is random. v7 embeds a Unix millisecond timestamp so IDs roughly sort by creation time. Both use the RFC 9562 layout.

Is this a password generator?

No. UUIDs are identifiers. Do not use them as passwords or secrets.

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