What does this UUID parser do?

This tool checks whether a string is a valid UUID, identifies its version and variant, and breaks down the value into its component fields. For v1/v6/v7 UUIDs it can also decode the embedded timestamp.

What does a UUID look like?

A UUID follows the format xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx where x is a hexadecimal digit (0–9, a–f). It is 36 characters long including the four hyphens. Example: 550e8400-e29b-41d4-a716-446655440000.

UUID v4 is a randomly generated UUID. Its bits are set using a cryptographically secure random number generator, making it statistically unique. The version field is set to 4 (the 13th character is always '4') and the variant field follows RFC 4122.

UUID v4 has 122 bits of randomness, giving 2^122 possible values (about 5.3 × 10^36). The probability of generating a duplicate is astronomically small — roughly 1 in 5.3 undecillion — making them effectively unique for all practical purposes.

Free · Client-side · RFC 4122

UUID Parser

Paste a UUID to decode its structure, version, variant, and embedded timestamp (v1/v6/v7). All processing happens in your browser.

UUID Parser

Inspect any UUID (v1–v7) instantly

Enter a UUID to view its components, version, variant, and decoded timestamp (if available). Nothing is sent to a server.

UUID

Paste a UUID and click Parse to inspect its fields.

What is a UUID?

A UUID (Universally Unique Identifier) is a 128-bit identifier used to uniquely identify information in computer systems without centralized coordination. It is standardized by RFC 4122 and represented as a 32-character hexadecimal string split into 5 groups separated by hyphens.

550e8400-e29b-41d4-a716-446655440000

Length

36 characters — 32 hex digits + 4 hyphens

Randomness

122-bit entropy — ~5.3 × 10³⁶ possible values

Standard

RFC 4122 — also ITU-T X.667 and ISO/IEC 9834-8

Overview

What is a UUID?

A UUID (Universally Unique Identifier), also known as a GUID (Globally Unique Identifier), is a 128-bit label standardized by the Internet Engineering Task Force under RFC 4122.

UUIDs are designed to be unique across all time and space without requiring a central registration authority. Two independently generated UUIDs can be assumed to be distinct, thanks to their extreme statistical uniqueness.

128 bits = 16 bytes of data
Represented as 32 hex digits + 4 dashes (36 chars)
Case-insensitive — upper or lowercase are equivalent
Supported natively in PostgreSQL, MySQL, MongoDB, and more

UUID Format

550e8400-e29b-41d4-a716-446655440000

550e8400 time_low
32 bits

e29b time_mid
16 bits

41d4 time_hi & version
16 bits

a716 clock_seq
16 bits

446655440000 node
48 bits

The 13th character encodes the version (e.g. 4 for v4).
The 17th character (after 3rd dash) encodes the variant.

Versions

UUID Versions Compared

There are several UUID versions, each suited to different use cases.

Version	Generation Method	Best For	Requires
v1	MAC address + timestamp	Time-ordered logging — UUID v1 Generator →	Network interface
v2	DCE Security (POSIX UID/GID)	Legacy DCE systems	System identity
v3	MD5 hash of namespace+name	Deterministic IDs from names — UUID v3 Generator →	Namespace UUID + input
v4	Cryptographically random	General purpose — most common — UUID v4 Generator →	Nothing (this tool)
v5	SHA-1 hash of namespace+name	Deterministic IDs (secure)	Namespace UUID + input
v6	Reordered timestamp (RFC 9562)	Sortable time-based IDs	Clock + node
v7	Unix timestamp + random (RFC 9562)	Database-friendly sortable IDs	Nothing (modern standard)

UUID Examples

Sample UUIDs to Parse

Click any UUID to copy it, then paste it above and click Parse to inspect its fields.

How It Works

How UUID Parsing Works

This tool validates a UUID string against the canonical RFC 4122 format and breaks it into its component fields. It determines the version and variant, and decodes embedded timestamps for v1/v6/v7 UUIDs.

All processing happens locally in your browser. Nothing is sent to a server.

Validate the canonical UUID format: xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
Extract version (13th hex digit) and variant (17th hex digit)
Parse fields: time_low, time_mid, time_hi_and_version, clock_seq, and node
Decode embedded timestamps for v1/v6 (100‑ns since 1582) and v7 (unix ms)

Common Use Cases

UUIDs are the preferred unique identifier for:

Database primary keys REST API resource IDs Distributed systems Session tokens File naming Order & transaction IDs Message queue IDs User identifiers Microservice entities Idempotency keys Mobile device IDs Test fixture data

FAQ

Frequently Asked Questions

Concise answers about UUID parsing and this tool.

A UUID (Universally Unique Identifier) is a 128-bit identifier used to uniquely identify information in computer systems without centralized coordination. It is standardized by IETF RFC 4122 and represented as 32 hex digits separated by hyphens into 5 groups: xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx. Example: 550e8400-e29b-41d4-a716-446655440000.

A UUID is 36 characters long and looks like this: 550e8400-e29b-41d4-a716-446655440000. It consists of 32 hexadecimal digits (0–9 and a–f) arranged in the pattern 8-4-4-4-12 separated by hyphens. The format is case-insensitive; uppercase and lowercase are equivalent.

UUID v4 is a randomly generated UUID. Nearly all of its 128 bits are set using a cryptographically secure random number generator, with only 6 bits reserved to encode the version (4) and variant (RFC 4122). This makes it the simplest and most widely-used UUID version for general-purpose unique IDs.

UUID v4 has 122 bits of randomness, yielding approximately 5.3 × 10³⁶ possible values. The probability of generating a single duplicate after creating 1 billion UUIDs per second for 100 years is about 50% — so for practical purposes at any real-world scale, collisions are essentially impossible.

Use UUIDs when you need unique identifiers without a central authority: database primary keys in distributed systems, API resource identifiers, session tokens, file names to avoid collisions, transaction IDs, and anywhere you need globally unique values across multiple independent systems or services. If you need time-ordered identifiers (e.g. for Cassandra or audit logs), consider our UUID v1 Generator which embeds a timestamp in each ID. If you need deterministic name-based identifiers from the same namespace and string input, use our UUID v3 Generator.

UUID and GUID refer to the same concept. GUID (Globally Unique Identifier) is the term used by Microsoft in its COM/DCOM/OLE technologies, while UUID is the IETF standard term. Both use the same RFC 4122 format and are functionally identical.

Yes. All parsing happens locally in your browser. The tool does not send UUIDs to any server, and it does not store or log any input.

Ecosystem

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UUID Parser

UUID Parser

What is a UUID?

UUID Format

UUID Versions Compared

Sample UUIDs to Parse

How UUID Parsing Works

Common Use Cases

Frequently Asked Questions

What is a UUID?

What does a UUID look like?

What is UUID v4?

Are UUIDs truly unique?

When should I use a UUID?

What is the difference between UUID and GUID?

Is my UUID data private?

Complete UUID Tools Directory

UUID Generation

UUID Validation

UUID Parsing

UUID Formatting

UUID Conversion

Developer UUID Generators

Alternative ID Generators

25+ UUID & ID Tools

Explore All Free Developer Tools