UUID & ULID Inspector
Decode a UUID or ULID to reveal its version, variant, and embedded timestamp.
About this tool
Decode a UUID or ULID to reveal its version, variant, and embedded timestamp. Turn opaque strings from network traces, devtools, or SEO audits into structured output you can act on.
Paste a UUID or ULID string into the inspector. Review version, variant, and any embedded timestamp the format exposes. Example — Decode a ULID: try `01ARZ3NDEKTSV4RRFFQ69G5FAV` and expect something like `type: ULID timestamp: (decoded ms since epoch) raw: 01ARZ3NDEKTSV4RRFFQ69G5FAV`.
Cannot prove an ID was issued by your system — only decodes structure. See also: ULID & Nano ID Generator, UUID Generator, and Unix Timestamp Converter. Runs in your browser — nothing you paste gets uploaded.
How to use
- Paste a UUID or ULID string into the inspector.
- Review version, variant, and any embedded timestamp the format exposes.
- Compare timestamps when correlating IDs from logs created close together.
- Generate new IDs with the ULID & Nano ID Generator if you need fresh samples.
Example
Decode a ULID
Input
01ARZ3NDEKTSV4RRFFQ69G5FAV
Output
type: ULID timestamp: (decoded ms since epoch) raw: 01ARZ3NDEKTSV4RRFFQ69G5FAV
Limitations
- Cannot prove an ID was issued by your system — only decodes structure.
- Nonstandard or truncated IDs will fail validation.
- Nano IDs have no embedded timestamp to decode.
Related guides
1Related tools
3Frequently asked questions
What does the UUID & ULID Inspector do?
Decode a UUID or ULID to reveal its version, variant, and embedded timestamp. Runs in your browser — no install, no account.
How do I use the UUID & ULID Inspector?
Paste a UUID or ULID string into the inspector. Review version, variant, and any embedded timestamp the format exposes. Compare timestamps when correlating IDs from logs created close together. Generate new IDs with the ULID & Nano ID Generator if you need fresh samples.
Is the UUID & ULID Inspector free?
Yes. No signup, no usage limits, no paywall.
Does the UUID & ULID Inspector upload my data?
No. Processing happens locally in JavaScript. Your input is not uploaded, stored, or logged.
What are the limitations of the UUID & ULID Inspector?
Cannot prove an ID was issued by your system — only decodes structure. Nonstandard or truncated IDs will fail validation. Nano IDs have no embedded timestamp to decode.