Generator
Choose a UUID version, set the batch size, and generate clean IDs for databases, fixtures, APIs, and distributed workflows without leaving the browser.
Generation controls
Adjust the UUID version, output count, casing, and format before generating a fresh batch.
UUID v4 works best for random IDs.
Use v4 for general-purpose uniqueness across APIs, local data, and test fixtures.
Generated output
Copy the full batch, skim the results, or download them as a text file for scripts and workflows.
Most useful for
Random identifiers for general-purpose development work.
Quick cue
Standard UUID output matches the usual RFC display format.
Generated locally
Uses browser-side randomness so you can generate IDs without a service dependency.
How to Use This UUID Generator
Use the generator as a quick ID workspace: choose the UUID version, decide how you want the output formatted, then copy or download the batch you need.
Pick the UUID version you need
Use v4 when you want random IDs, or v7 when you want sortable IDs that work better in modern database workflows.
Set the batch size and output style
Choose how many IDs to generate, whether you want hyphens or compact output, and whether the text should stay lowercase or uppercase.
Generate, copy, or download the results
Create a fresh batch instantly, copy the whole list for scripts and fixtures, or download it as a text file for later use.
Use the IDs where they matter
Drop them into seed data, request tracing, test records, resource IDs, or any workflow that needs unique values without collisions.
When This Tool Is Most Useful
UUID generation is most helpful when you need clean unique identifiers right away and do not want to depend on a database sequence, server round-trip, or improvised placeholder values.
Database records and seed data
Generate unique IDs for test rows, fixtures, import jobs, and records that should not depend on auto-increment keys.
Distributed systems and tracing
Use UUIDs for correlation IDs, job references, event identifiers, and service-to-service request tracking.
API testing and debugging
Create clean IDs for request payloads, mocked responses, webhook fixtures, and local environment testing.
Front-end state and temporary objects
Assign stable IDs to client-side records, optimistic UI items, draft entities, and local-only collections.
Which UUID Version Should You Use?
Most developers do not need every UUID version. In practice, the main choice usually comes down to whether you want a random identifier or one that sorts better over time.
Best for random identifiers
UUID v4
Use v4 when you need general-purpose unique IDs for APIs, test fixtures, temporary objects, public resource IDs, or any workflow where randomness matters more than sort order.
- Great default for most software work
- Easy to use in APIs and client apps
- Strong fit for random public-facing IDs
Best for sortable identifiers
UUID v7
Use v7 when you want IDs that still stay unique but also sort more naturally by creation time. That makes it a strong fit for newer database workflows, event streams, and ordered records.
- Better for time-ordered inserts
- More natural sorting for recent records
- Useful for logs, jobs, and event pipelines
If you are unsure, start with v4. Choose v7 when ordered IDs will make your storage or event flow easier to work with.
FAQs
What is the difference between UUID v4 and v7?
UUID v4 is fully random. UUID v7 includes time ordering, which makes it easier to sort generated IDs and can work better for some database use cases.Does this tool generate UUIDs in the browser?
Yes. The generator uses browser-side cryptographic randomness, so the IDs are created locally without needing a server round-trip.Can I generate multiple UUIDs at once?
Yes. You can generate a single ID or a larger batch for scripts, migrations, fixtures, and bulk testing workflows.When would I use compact UUID output without hyphens?
Compact output is useful when you need a shorter raw hex string for internal tooling, storage formats, or systems that do not require the standard dashed representation.