Developer topic guide
UUID tools
Generate and decode UUIDs with free developer tools in your browser.
Topic guides
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Tools in this guide
Overview
UUID tools create version 4 identifiers for database keys and trace opaque IDs in logs. Generator produces random UUIDs; Lookup explains version and variant bits when decoding.
UUIDs are not guaranteed unique across systems unless you use proper generation libraries in production services. Use these tools for ad hoc testing and debugging.
When storing UUIDs in URLs, prefer lowercase canonical form to avoid duplicate cache entries.
How to choose
- New random ID → UUID Generator.
- Inspect existing UUID → UUID Lookup.
Frequently asked questions
Which UUID version is generated?
See UUID Generator — typically version 4 random UUIDs.
Can UUIDs collide?
Collision risk is negligible for v4 at normal scale, but databases still need unique constraints.
Is generation cryptographically secure?
Browser crypto APIs are used where supported; see tool limitations for details.
Related workflows
These multi-step guides chain tools from this category for common jobs.