UUID Format

Uppercase UUID Generator

Some systems — notably Microsoft-flavoured tooling and older Java stacks — expect hex digits in capitals. This page generates uppercase UUIDs directly.

A–F in capitalsAny versionValue unchanged

Version

How many

Uppercase Hyphens Braces { }

Result

Generated locally with the Web Crypto API — nothing leaves your browser.

What Is Uppercase UUID Generator?

Hex digits are case-insensitive: A and a represent the same four bits. An uppercase UUID carries identical information to a lowercase one — only the text differs.
This page generates UUIDs and renders them in uppercase, which is the convention in Microsoft GUID documentation and in RFC 4122's own examples.

How to generate

Leave the Uppercase toggle on.
Choose a version — v4 for random, v7 for sortable keys.
Press Generate and copy the capitalised result.

Use Cases

Microsoft-oriented tooling that prints and expects {AABBCCDD-…} in capitals.
Legacy Java services where UUID.toString() output was normalised to upper case.
Log consistency when a log aggregator groups by exact string.

How Uppercase UUID Generator Compares

Uppercase	9A8B7C6D-5E4F-4A3B-8C1D-2E3F4A5B6C7D
Lowercase	9a8b7c6d-5e4f-4a3b-8c1d-2e3f4a5b6c7d
Same value?	Yes — identical 128 bits, different glyphs

Code Examples

JavaScript

const id = crypto.randomUUID().toUpperCase();

Python

import uuid
print(str(uuid.uuid4()).upper())

SQL

SELECT upper(gen_random_uuid()::text);

Frequently Asked Questions

Does uppercase change the UUID's value?

No. Case is purely presentational; the 128 bits are identical.

Which databases compare UUIDs case-sensitively?

PostgreSQL's native uuid type does not; a CHAR(36) column with a case-sensitive collation would treat the two forms as different strings.

Should I store uppercase or lowercase?

Pick one and normalise on write. Lowercase is the most common convention; uppercase is expected in Microsoft ecosystems.