Best Free UUID Generator Alternatives in 2026
UUID generation is built into most languages, but a quick web tool is handy when you need one outside of code.
uuidgen (CLI)
macOS and Linux built-in
Key difference: Generates one UUID per invocation — awkward for bulk and not available on Windows by default.
Online single-UUID tools
Various web pages
Key difference: Most generate only one UUID at a time without bulk support or format options.
Code in Node / Python / etc.
Native language UUIDs
Key difference: Perfect if you are already in code. Slower for one-off generation when you just need a UUID for a test config.
UUID Generator on ToolsePulse
Bulk generation up to 1000, four format options, copy individual or copy all, all browser-side with cryptographically secure randomness.
Use cases
Database primary keys
Pre-generate UUIDs for inserting test data or seeding a database without round-tripping to the DB for each ID.
API request tracing
Grab a few request IDs or trace IDs for testing logging and observability pipelines.
Feature flag rollouts
Generate user IDs or session IDs for testing percentage-based feature flag bucketing.
Test fixtures
Populate test fixtures and mock data with realistic UUID values instead of hardcoded placeholder strings.