UUID Uppercase
Paste any UUID (or multiple UUIDs) and convert them to uppercase instantly. Great for formatting and consistent storage.
UUID Uppercase
Powered byJavaScript & RFC 4122
All conversion happens locally in your browser. Nothing is sent to any server.
Paste UUIDs and click Convert to get uppercase versions.
Why convert UUIDs to uppercase?
Some systems require consistent case (e.g., uppercase) for UUIDs. This tool ensures all letters are converted to uppercase while leaving the structure and hyphens intact.
Supports multiple UUIDs
Paste multiple UUIDs (one per line) and the tool converts each one independently.
Format maintained
Hyphens remain in place (UUID format unchanged), only letters are uppercased.
Use cases
Useful for systems that perform case-sensitive comparisons or require canonical UUID formatting.
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
32 bits
16 bits
16 bits
16 bits
48 bits
The UUID format remains the same; this tool only changes letter case to uppercase.
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 (random) |
| 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) |
Example UUIDs
Click an example to convert it to uppercase.
How This UUID Uppercase Tool Works
This tool validates that each input line is a proper UUID, then converts letters to uppercase while leaving hyphens and overall structure intact.
All conversion happens locally in your browser. Your UUIDs are never sent or stored.
Common Use Cases
This tool is useful when you need to:
Frequently Asked Questions
Concise answers about uppercase UUID conversions.
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