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UUID Version Generator (v1–v8)

· Last updated：2026-09-03

Generate RFC 9562 UUIDs — including the modern v6, v7 and v8 that most generators lack — or decode any UUID back to its version, variant and embedded timestamp.

Details

What this tool helps you do

A full-range UUID generator covering every RFC 9562 version: v1 (time-based, Gregorian timestamp + node), v4 (random), v5 (deterministic SHA-1 namespaced with the DNS/URL/OID/X.500 namespaces), v6 (v1 with k-sortable reordered timestamp), v7 (48-bit Unix-millisecond timestamp + random — the database-friendly one that sorts correctly) and v8 (custom version field, filled with CSPRNG random here). Generate up to 100 at a time in lower- or uppercase. Switch to decode mode to parse any UUID: it reports the version, variant, and — for v1/v6/v7 — extracts the embedded timestamp and renders it as an exact UTC date, which is the quickest way to check whether a v7 is well-formed or where a v1 came from. The v5 mode is deterministic, so the same namespace + name always yields the same UUID.

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Written by the Elysia Tools team

Tool usage guide

Learn when to use this tool, what it supports, and how real users apply it.

Key facts

Category
Development
Input types
select, number, checkbox, text
Output type
text
Sample coverage
4
API ready
Yes

Overview

Generate standards-compliant RFC 9562 UUIDs across all versions (v1, v4, v5, v6, v7, and v8) or switch to decode mode to inspect version, variant, and embedded UTC timestamps.

When to use

  • Creating sortable primary keys with UUIDv7 or UUIDv6 for database indexing and optimized write performance.
  • Generating deterministic UUIDv5 identifiers from specific namespaces (DNS, URL, OID, X.500) and names.
  • Decoding existing UUIDs to extract embedded timestamps, verify RFC 9562 compliance, or inspect version and variant metadata.

How it works

  1. 1Select your operating mode: choose 'Generate UUIDs' to create identifiers or 'Decode a UUID' to inspect an existing one.
  2. 2If generating, select the desired UUID version (v1, v4, v5, v6, v7, or v8), configure options like count (up to 100), case format, or v5 namespace and name values.
  3. 3If decoding, paste your UUID string to parse its components.
  4. 4Receive instant output showing your generated UUID list or a full breakdown of the decoded UUID's version, variant, and human-readable UTC timestamp.

Use cases

  • Provisioning batch UUIDv7 keys for high-throughput relational databases like PostgreSQL or MySQL.
  • Creating repeatable UUIDv5 resource identifiers from domain names or URLs for API entities.
  • Inspecting system audit logs by decoding UUID timestamps to trace the exact creation time of events.

Examples

1. Generate Database-Friendly UUIDv7 Batch

Backend Engineer

Background

An engineer needs a set of time-ordered, collision-resistant primary keys for a new transactional database table.

Problem

Traditional UUIDv4 causes index degradation due to random distribution, requiring time-ordered UUIDv7 keys instead.

How to use

Select 'Generate UUIDs', set Version to 'v7', set count to 5, and choose lowercase formatting.

mode: generate, version: v7, count: 5, uppercase: false

Outcome

Receives five chronological UUIDv7 values ready for insertion as database primary keys.

2. Decode an RFC 9562 Test Vector

QA Tester

Background

A quality assurance engineer needs to verify that a received UUID identifier contains valid timestamp metadata.

Problem

Need to confirm whether an incoming identifier is well-formed UUIDv7 and determine its exact creation time.

How to use

Switch mode to 'Decode a UUID' and input the UUID string '017f22e2-79b0-7cc3-98c4-dc0c0c07398f'.

FAQ

Why use UUIDv7 instead of UUIDv4 for database primary keys?

UUIDv7 embeds a 48-bit millisecond Unix timestamp at the beginning, making values naturally time-ordered and significantly reducing B-tree index fragmentation compared to random UUIDv4.

What is the difference between UUIDv1 and UUIDv6?

Both use Gregorian timestamps and node IDs, but UUIDv6 reorders the timestamp bits to place the most significant time components first, enabling chronological sorting.

Are UUIDv5 identifiers unique across repeated generations?

UUIDv5 is deterministic: passing the same namespace and string name will always produce the identical UUID output.

Which UUID versions support embedded timestamp extraction during decoding?

Decode mode extracts and displays human-readable UTC timestamps for time-based versions: v1, v6, and v7.

How many UUIDs can I generate in a single request?

You can generate anywhere from 1 to 100 UUIDs per run in either lowercase or uppercase formatting.

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mode: decode, uuidToDecode: 017f22e2-79b0-7cc3-98c4-dc0c0c07398f

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3. Deterministic Entity ID Generation

API Architect

Background

An architect needs consistent UUID identifiers mapped to external domain records across multiple microservices.

Problem

Random IDs cause duplicate records when synced from external web domains.

How to use

Select 'Generate UUIDs', choose Version 'v5', pick the 'dns' namespace, and enter the domain name 'example.com'.

mode: generate, version: v5, namespace: dns, name: example.com, count: 1

Outcome

Generates a deterministic SHA-1 hashed UUIDv5 (cfbff0d1-9375-5685-968c-48ce8b15ae17) reproducible across all systems.