How do I convert hex to a UUID?

Paste a 32-character hex string into the tool and click Convert. The tool formats it as a standard UUID (8-4-4-4-12).

What format does the hex need to be in?

The input must be 32 hex digits (0-9, a-f). The tool accepts upper or lower case and ignores surrounding whitespace.

Can I convert multiple hex strings at once?

Yes. Paste multiple 32-character hex strings, one per line, and the tool converts each to UUID. Lines that do not match are flagged.

Is a GUID the same as a UUID?

Yes. GUID (Globally Unique Identifier) is Microsoft's name for the same 128-bit identifier defined by RFC 4122 as a UUID. The formatting is identical, so this hex to UUID converter also works as a hex to GUID converter — the output string is valid in either context.

How do I convert a string to a UUID?

It depends what the string is. If it's already a 32-character hex string, this tool formats it into a UUID by inserting hyphens. If it's an arbitrary string like a filename or email address, you need a name-based UUID (version 3 or version 5), which hashes the string against a namespace to produce a deterministic UUID.

Free · Client-side · RFC 4122

Hex to UUID

Convert a plain 32-character hex string into a standard UUID — this hex to UUID converter also works as a hex to GUID converter, since a GUID is the same 128-bit format. Ideal for systems that store the hex uuid without hyphens.

Hex to UUID

All conversion happens locally in your browser. Nothing is sent to any server.

Hex (one per line)

Paste hex values and click Convert to get UUID output.

Why convert hex to a UUID?

Some systems store UUIDs as plain 32-character hex strings. Converting to the standard UUID format makes them easier to read, share, and use in tools that expect hyphenated UUIDs.

550e8400e29b41d4a716446655440000 → 550e8400-e29b-41d4-a716-446655440000

Retains all data

The UUID is the exact same 128-bit value; the tool just inserts the required hyphens for a valid UUID.

Supports multiple lines

Paste several hex strings (one per line) and convert them all at once. Invalid lines are flagged with line numbers.

Client-side only

Conversion happens entirely in your browser; nothing is sent to a server.

Overview

What is a UUID?

A UUID (Universally Unique Identifier) is a 128-bit value standardized by RFC 4122. It is usually shown as a 36-character string with hyphens.

Converting a hex string into UUID format makes it compatible with libraries and systems that expect the hyphenated representation.

128 total bits (16 bytes)
Hex string: 32 characters (0-9, a-f)
UUID format: 36 chars (adds 4 hyphens)
Useful for interoperability and readability

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

This tool inserts the standard hyphen pattern into a 32-character hex string so it becomes a valid UUID.

Related Conversions

Hex to GUID, String to UUID, and Going the Other Way

A few related jobs developers often search for right alongside "hex to uuid."

Hex to GUID?

GUID (Globally Unique Identifier) is Microsoft's name for the same 128-bit value RFC 4122 calls a UUID. There's no structural difference, so this hex to UUID converter doubles as a hex to GUID converter — the output string is valid wherever a GUID or a UUID is expected.

Convert String to UUID?

If your "string" is a 32-character hex string, this tool is exactly what you need. If you instead want to turn an arbitrary string — a filename, URL, or email address — into a deterministic UUID, that's name-based UUID generation. Use the UUID v5 Generator or UUID v3 Generator to hash a string against a namespace instead.

Need UUID to Hex Instead?

Already have a formatted UUID and need the raw hex string back — say, to store it in a BINARY(16) column? Use the UUID to Hex converter. It's the exact reverse of this tool and strips the hyphens for you.

Versions

UUID Versions Compared

All UUID versions are 128 bits, so they all follow the same UUID formatting.

Version	Generation Method	Use Case	Requires
v1	Timestamp + MAC address	Time-ordered logging	Network interface
v2	DCE security (UID/GID)	Legacy DCE systems	System identity
v3	MD5 hash of namespace+name	Deterministic IDs	Namespace + name
v4	Random	General purpose — UUID v4 Generator →	None
v5	SHA-1 hash of namespace+name	Deterministic IDs (secure)	Namespace + name
v6	Reordered timestamp (RFC 9562)	Sortable time-based IDs	Clock + node
v7	Unix timestamp + random (RFC 9562)	Database-friendly sortable IDs	None

Live Examples

Example Hex Strings

Click an example to convert it to a UUID.

How It Works

How This Hex → UUID Tool Works

This tool validates each input is a 32-character hex string, inserts the required hyphens, and renders a valid UUID.

Everything runs locally in your browser; no data leaves your device.

Private / client-side Instant conversion RFC 4122 compliant No external dependencies

Common Use Cases

Common reasons to convert hex strings into UUIDs include:

Interoperability with UUID libraries Working with systems that store IDs as raw hex Debugging UUID format issues Converting hex IDs into readable UUIDs

Want the full picture?

Read our in-depth guide on converting hex strings to UUIDs and GUIDs — covering byte order, database storage, and name-based UUIDs.

Read the Hex to UUID Guide

FAQ

Frequently Asked Questions

Answers to common questions about converting hex to UUID.

A UUID is a 128-bit identifier that is usually represented as a 36-character string with hyphens, following RFC 4122.

The tool expects 32 hexadecimal characters. Lines that don’t match this format will be flagged invalid.

Yes. The tool normalizes input to lowercase before converting.

Yes. This tool runs entirely in your browser. Nothing is sent to a server or stored externally.

Yes. GUID is Microsoft's name for the same 128-bit identifier RFC 4122 defines as a UUID. The formatting is identical, so this hex to UUID converter also works as a hex to GUID converter.

If the string is already 32 hex characters, use this tool to insert the hyphens. If it's an arbitrary string like a filename or URL, use a name-based UUID generator (UUID v5 or UUID v3), which hashes the string against a namespace to produce a deterministic UUID.

Use the UUID to Hex converter — the reverse of this tool. It strips the hyphens from a standard UUID and returns the plain 32-character hex string.

Hex to UUID

Hex to UUID

What is a UUID?

UUID Format

Hex to GUID, String to UUID, and Going the Other Way

Hex to GUID?

Convert String to UUID?

Need UUID to Hex Instead?

UUID Versions Compared

Example Hex Strings

How This Hex → UUID Tool Works

Common Use Cases

Frequently Asked Questions

Complete UUID Tools Directory

UUID Generation

UUID Validation

UUID Parsing

UUID Formatting

UUID Conversion

Developer UUID Generators

Alternative ID Generators

25+ UUID & ID Tools

Hex to UUID

Hex to UUID

What is a UUID?

UUID Format

Hex to GUID, String to UUID, and Going the Other Way

Hex to GUID?

Convert String to UUID?

Need UUID to Hex Instead?

UUID Versions Compared

Example Hex Strings

How This Hex → UUID Tool Works

Common Use Cases

Frequently Asked Questions

What is a UUID?

What if my hex string is not 32 chars?

Can I paste uppercase hex?

Is this tool secure?

Is a GUID the same as a UUID?

How do I convert a string to a UUID?

How do I convert a UUID back to hex?

Complete UUID Tools Directory

UUID Generation

UUID Validation

UUID Parsing

UUID Formatting

UUID Conversion

Developer UUID Generators

Alternative ID Generators

25+ UUID & ID Tools