UUID Generator
Generate RFC 4122 UUID v4 identifiers instantly.
Examples
Sample inputs and expected outputs
Single UUID v4
Input
{
"count": 1
}Output
550e8400-e29b-41d4-a716-446655440000
Batch of UUIDs
Input
{
"count": 3
}Output
6ba7b810-9dad-11d1-80b4-00c04fd430c8 6ba7b811-9dad-11d1-80b4-00c04fd430c8 6ba7b812-9dad-11d1-80b4-00c04fd430c8
UUID Generator
Universally unique identifiers explained
UUIDs are 128-bit values displayed as 36-character hexadecimal strings with hyphens, such as 550e8400-e29b-41d4-a716-446655440000. Version 4 UUIDs derive randomness from secure sources, making collisions astronomically unlikely for practical application scales.
Developers assign UUIDs as primary keys in distributed databases where auto-increment integers clash across merged shards. APIs expose UUIDs externally to avoid leaking sequential business metrics.
File systems, IoT provisioning, and session tokens sometimes adopt UUID formats for opaque identifiers users cannot guess sequentially.
UUID v4 vs other versions
Version 1 embeds timestamp and MAC address traces—privacy concerns led many teams prefer random v4. Version 7 time-sortable UUIDs gain adoption for index locality but v4 remains default interoperability choice.
Our generator focuses v4 per RFC 4122 random variant bits set correctly in the third group.
Never roll your own UUID scheme with Math.random alone in production; use vetted libraries or trusted generators like this tool for manual debugging only.
Database and API workflows
Seed development databases with batch UUID generation count set to ten, paste into SQL INSERT statements or JSON fixtures.
QA validates UUID input fields accept standard formatting and reject malformed strings missing hyphens or containing invalid characters.
Log correlation IDs for microservices tracing sometimes reuse UUID format for grep-friendly uniqueness across log aggregators.
Collision probability intuition
Birthday paradox math still leaves v4 collision risk negligible below billions of records. Monitor application-level uniqueness constraints regardless as defense in depth.
If absolute determinism required, hash-based v5 from namespace plus name suits reproducible IDs; random v4 suits opaque public identifiers.
Document ID strategy in architecture decision records so new services stay consistent.
Free developer utility
GeneratorBase UUID tool requires no npm install when you need one-off IDs on machines without uuid package access. Copy individually or as lists.
GeneratorBase runs entirely in your browser, which means your inputs and generated results stay on your device unless you choose to copy or download them elsewhere.
There is no account requirement, no usage cap, and no hidden tracking of the values you create with this tool.
Whether you are prototyping an app, preparing content for social media, or solving a quick everyday problem, this generator is designed to deliver accurate output in seconds.
Adjust presets first if you are new to the tool, then fine-tune individual fields until the output matches your project requirements.
Bookmark this page if you expect to return frequently; settings are easy to change between sessions without losing familiarity with the interface.
GeneratorBase runs entirely in your browser, which means your inputs and generated results stay on your device unless you choose to copy or download them elsewhere.
There is no account requirement, no usage cap, and no hidden tracking of the values you create with this tool.
Whether you are prototyping an app, preparing content for social media, or solving a quick everyday problem, this generator is designed to deliver accurate output in seconds.
Adjust presets first if you are new to the tool, then fine-tune individual fields until the output matches your project requirements.
Bookmark this page if you expect to return frequently; settings are easy to change between sessions without losing familiarity with the interface.
GeneratorBase runs entirely in your browser, which means your inputs and generated results stay on your device unless you choose to copy or download them elsewhere.
There is no account requirement, no usage cap, and no hidden tracking of the values you create with this tool.
Whether you are prototyping an app, preparing content for social media, or solving a quick everyday problem, this generator is designed to deliver accurate output in seconds.
Adjust presets first if you are new to the tool, then fine-tune individual fields until the output matches your project requirements.
Bookmark this page if you expect to return frequently; settings are easy to change between sessions without losing familiarity with the interface.
GeneratorBase runs entirely in your browser, which means your inputs and generated results stay on your device unless you choose to copy or download them elsewhere.
There is no account requirement, no usage cap, and no hidden tracking of the values you create with this tool.
Whether you are prototyping an app, preparing content for social media, or solving a quick everyday problem, this generator is designed to deliver accurate output in seconds.
Adjust presets first if you are new to the tool, then fine-tune individual fields until the output matches your project requirements.
Bookmark this page if you expect to return frequently; settings are easy to change between sessions without losing familiarity with the interface.
GeneratorBase runs entirely in your browser, which means your inputs and generated results stay on your device unless you choose to copy or download them elsewhere.
There is no account requirement, no usage cap, and no hidden tracking of the values you create with this tool.
Whether you are prototyping an app, preparing content for social media, or solving a quick everyday problem, this generator is designed to deliver accurate output in seconds.
Frequently Asked Questions
Yes, RFC 4122 version 4 random UUIDs.