Free Online UUID Generator — UUID v4, v7 & GUIDs in Bulk
Create random UUID v4 or time-ordered UUID v7 in bulk (up to 1,000). Uppercase, no hyphens, and UUID validation included.
Quick answer
To generate a UUID, open the KaviForge UUID Generator — 10 random UUID v4 values are created immediately. Choose UUID v7 for time-ordered IDs that sort well as database keys, set how many you need (up to 1,000), pick uppercase, no hyphens, or braces, then copy or download them.
Generate UUID v4, time-ordered UUID v7, and GUIDs in bulk. Copy uppercase or hyphen-free IDs, and validate any UUID instantly.
Version 4 UUIDs are fully random. Version 7 UUIDs (RFC 9562) start with a millisecond timestamp, so they are unique and sortable by creation time — ideal for database primary keys.
How to Generate UUIDs
- 1Choose the version: UUID v4 (random), UUID v7 (time-ordered), or the Nil UUID.
- 2Enter how many UUIDs you need, from 1 to 1,000.
- 3Click "Generate" to create a fresh batch.
- 4Toggle uppercase, hyphens, or braces to match your required format.
- 5Click "Copy all" or download the list as a .txt file.
Features
UUID v4 & v7
Random v4 and time-ordered v7 UUIDs following RFC 9562.
Bulk Generation
Generate up to 1,000 UUIDs in one click.
Format Options
Uppercase, lowercase, with or without hyphens, and {braces} for GUIDs.
Cryptographically Secure
Uses the browser’s crypto.randomUUID and crypto.getRandomValues.
UUID Validator
Check any UUID/GUID and see its version, variant, and v7 timestamp.
Copy & Download
Copy the whole list or save it as a text file.
When to Use the UUID Generator
Database primary keys
Use UUID v7 for keys that are globally unique and index-friendly.
Test data and fixtures
Generate hundreds of IDs to seed databases or mock API responses.
Idempotency keys and request IDs
Attach a unique ID to API requests, events, or log correlation.
.NET and Windows GUIDs
Enable uppercase and braces for the {XXXXXXXX-…} GUID format.
About the UUID Generator
UUID v4 uses 122 random bits, so the chance of a collision is negligible even across billions of IDs. UUID v7 stores a 48-bit Unix millisecond timestamp followed by random bits.
All UUIDs are generated locally with the Web Crypto API. They are never sent to or stored on a server.
UUID Generator FAQs
How do I generate a UUID online?
Open the KaviForge UUID Generator. Ten UUID v4 values are generated automatically; click "Generate" for more or change the count and version.
What is the difference between UUID v4 and UUID v7?
UUID v4 is completely random. UUID v7 begins with a timestamp, so values sort in creation order, which improves database index performance.
Is a GUID the same as a UUID?
Yes. GUID is Microsoft’s name for a UUID. Enable uppercase and braces to get the typical Windows GUID format.
Can UUIDs collide?
In practice, no. With 122 random bits, you would need to generate billions of UUIDs per second for many years to have a meaningful chance of a duplicate.
Are these UUIDs secure?
They are generated with the browser’s cryptographically secure random number generator. Still, UUIDs are identifiers, not secrets — do not use them as passwords.
How many UUIDs can I generate at once?
Up to 1,000 per batch. Generate multiple batches if you need more.
Popular UUID Generator searches
- UUID v4 Generator OnlineGenerate random UUID v4 values online. Cryptographically secure, RFC 4122 / RFC 9562 compatible, free and private in your browser.
- UUID v7 GeneratorGenerate time-ordered UUID v7 values (RFC 9562). Better as database primary keys than random UUID v4 because they sort by creation time.
- GUID Generator OnlineGenerate a GUID online in the Windows {XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX} format or as a plain UUID. Free, no signup.
- UUID Validator OnlineValidate a UUID or GUID online. Check the 8-4-4-4-12 shape, version nibble and RFC variant, including the Nil UUID.
- Generate a UUID Without HyphensGet a UUID as 32 hex characters with no hyphens. Useful for filenames, tokens and systems that reject the dashed format.
- Bulk UUID GeneratorGenerate many UUIDs at once — up to 1,000 UUID v4 or v7 values. Copy or download the list. Free and browser-based.
- The Nil UUID ExplainedThe Nil UUID is 00000000-0000-0000-0000-000000000000. See when to use it, how validators treat it, and why it is not a random ID.
- Uppercase GUID GeneratorGenerate an uppercase GUID / UUID. Some Windows APIs and .NET codebases expect hex A–F instead of a–f.
- UUIDs as Database Primary KeysShould you use UUID v4 or UUID v7 as a primary key? See how each version affects index locality, and generate sample keys.
- UUID vs GUIDUUID and GUID are the same 128-bit identifier. Learn the naming, formatting differences and how to convert between them.
Related Developer Tools
Hash Generator
Generate MD5, SHA-1, SHA-256, SHA-384, and SHA-512 hashes of text or files at once. HMAC supported.
Unix Timestamp Converter
Convert Unix epoch timestamps to dates and dates to timestamps. Seconds, milliseconds, UTC, and local time.
Regex Tester
Test JavaScript regular expressions with live match highlighting, capture groups, and replace.