UUID Generator guide
Generate one or many random version 4 UUIDs for test data, database records, fixtures, and development workflows.
What this tool does
The UUID Generator creates RFC 4122-style version 4 identifiers with random bytes supplied by the browser's cryptographic random-number generator. Each standard result contains 32 hexadecimal characters separated into the familiar 8-4-4-4-12 pattern. The version bits identify UUID v4, while the variant bits use the standard layout expected by common programming languages and databases.
You can generate between 1 and 100 identifiers in one operation, switch the letters to uppercase, or remove hyphens when a system expects a compact 32-character value. Copy the complete batch or download it as a plain-text file with one identifier per line.
A UUID is designed to make accidental collisions extremely unlikely, but it is not a human-readable sequence, database counter, access-control mechanism, or proof that a record is authentic. Treat generated values as identifiers rather than secrets. If an application needs signed, sortable, or deterministic identifiers, choose a scheme designed for that requirement.
How to use it
- Enter how many UUIDs you need, from 1 to 100.
- Choose uppercase letters or compact output only if your target system requires it.
- Select Generate UUIDs to create a fresh batch.
- Copy all results or download the text file.
- Generate again whenever you need unrelated values.
The tool does not remember previous batches, compare them with your database, or reserve an identifier in another system. Perform normal uniqueness checks when inserting records where the database requires them.
Benefits
- Uses cryptographically strong browser randomness
- Produces correctly marked version 4 and variant bits
- Generates up to 100 identifiers per batch
- Offers standard, uppercase, and hyphen-free output
- Copies or downloads newline-separated results
- Keeps generation entirely on the current device
Practical notes
UUID text is case-insensitive in most systems, so uppercase and lowercase forms normally represent the same identifier. Removing hyphens changes presentation, not the underlying 128-bit value, but some validators accept only the standard hyphenated representation. Confirm the format required by an API or database column before importing a large batch.
Do not use a UUID alone as a password, session token, API key, or authorization check. A random-looking identifier can still appear in logs, browser history, analytics, or shared links.
Use the UUID Inspector to normalize an existing identifier and review its version, variant, nil status, and bytes. Structural inspection does not prove that a UUID is unique or trustworthy.