UUID Generator
Generate one or many random UUID v4 / GUID values instantly in your browser. Free with no sign-up.
UUID / GUID generator
Generate one or many random version-4 UUIDs (also called GUIDs) using your browser's secure random generator. Choose lowercase, uppercase or no-dash formatting and copy them all at once. Perfect for database keys and testing.
How to generate a UUID v4
- Choose how many UUIDs you need.
- Click Generate to create random UUID v4 values.
- They are generated instantly in your browser.
- Copy the UUIDs. Nothing is uploaded.
How to Generate a UUID Quickly with Kwiklr
Universally unique identifiers (UUIDs) are 128‑bit numbers used to tag information without collisions, even across distributed systems.
Whether you need IDs for database rows, session tokens, or file names, generating a correct UUID is easier than you think, especially with Kwiklr’s free online tools.
Why UUIDs Matter and How They Work
A UUID consists of 32 hexadecimal characters displayed in five groups (8‑4‑4‑4‑12). The most common version, UUID‑v4, is generated from random or pseudo‑random numbers, giving an astronomically low chance of duplication.
Because the format is standardized (RFC 4122), any programming language or database can parse and compare UUIDs, making them ideal for interoperability.
How to Generate a UUID
- Open the Kwiklr UUID Generator page at uuid-generator.html.
- The tool generates version 4 (random) UUIDs — the kind almost every application wants.
- If you need several, set How many?. Pick lowercase, UPPERCASE or no-dashes under Format.
- Click the “Generate” button.
- The tool instantly displays one or more UUIDs in a read‑only text area. Use the copy button to paste them wherever you need.
Tips for Using UUIDs
- Store UUIDs as CHAR(36) or BINARY(16) in databases for optimal performance.
- Avoid exposing raw UUIDs in public URLs if you need additional privacy; consider hashing them.
- When generating many IDs at once, verify that the tool’s output matches the RFC 4122 pattern: xxxxxxxx-xxxx-Mxxx-Nxxx-xxxxxxxxxxxx.
Common Problems
Some users report receiving “invalid format” errors when copying UUIDs that contain hidden whitespace. Always trim the string before inserting it into code or a database.
If you need a deterministic ID (e.g., based on a name), use a name‑based UUID (v5) instead of the random v4.
Related tools: UUID Generator, Hash Generator.
Frequently asked questions
What is a UUID v4?
A UUID v4 is a random 128-bit identifier, commonly used as a unique ID in databases and code.
Can I generate many UUIDs at once?
Yes. Set the count to generate a bulk list of UUIDs in one click.
Are the UUIDs generated privately?
Yes. They are created in your browser using secure randomness.
Is it free?
Yes. The generator is completely free with no sign-up.
What is a UUID?
A UUID is a 128‑bit identifier that is globally unique, used to label data without central coordination.
Can I generate UUIDs offline?
Yes, most programming languages have libraries that create RFC 4122‑compliant UUIDs without internet access.
Why choose v4 over other versions?
v4 relies on random numbers, offering the simplest implementation and the lowest collision probability for most applications.