მთავარი მიღებული
- 01Generate one UUID or up to 100 at once — ideal for test fixtures, seed data, and configuration.
- 02UUID v4 is fully random; UUID v7 embeds a millisecond timestamp for chronological sorting in databases.
- 03Every UUID is generated using the browser's Web Crypto API — no weak Math.random() fallback.
- 04Toggle lowercase/uppercase, remove dashes, or add curly braces to match your exact environment.
What UUIDs Are and Why They Matter
A UUID (Universally Unique Identifier), sometimes called a GUID, is a 128-bit identifier designed to be globally unique without any central coordination. Databases, APIs, event systems, and distributed applications use UUIDs to assign IDs to records, objects, and events without needing a shared auto-increment counter or a round-trip to a database sequence.
There are multiple UUID versions. Version 4 is fully random — the most common choice for general-purpose IDs. Version 7, a newer standard, embeds a millisecond-precision timestamp in the first bytes so that IDs generated in sequence sort chronologically. That property dramatically improves insert performance in B-tree database indexes, where random IDs cause costly page splits.
How to Generate UUIDs
- 01
Choose v4 or v7
Select UUID v4 for a fully random identifier or UUID v7 if you need chronologically sortable IDs for a database primary key.
- 02
Set the quantity
Drag the slider or type a number to generate between 1 and 100 UUIDs in a single batch.
- 03
Customize the format
Toggle lowercase or uppercase, enable or disable dashes (xxxxxxxx-xxxx-...), and optionally wrap each UUID in curly braces ({...}) to match the format your language or framework expects.
- 04
Copy or download
Click Copy All to put the entire list on your clipboard, or download the batch as a .txt file for use in test fixtures or seed scripts.
UUID Format Options at a Glance
Different ecosystems expect slightly different representations of the same 128-bit value.
- 01Standard with dashes: 550e8400-e29b-41d4-a716-446655440000 (RFC 4122 canonical form).
- 02No dashes: 550e8400e29b41d4a716446655440000 (common in some databases and Redis keys).
- 03Uppercase: 550E8400-E29B-41D4-A716-446655440000 (used in some Microsoft and Java environments).
- 04Curly braces: {550e8400-e29b-41d4-a716-446655440000} (Microsoft GUID format, used in .NET and COM).
- 05All formats represent the same 128-bit value — pick the one your system expects.
Cryptographically Secure and Fully Local
Every UUID is generated using crypto.randomUUID (v4) or crypto.getRandomValues (v7) — the Web Crypto API built into every modern browser. There is no Math.random(), no weak seed, and no server involved. The generator works offline once the page is loaded.
Nothing is transmitted or stored. Close the tab and the UUIDs are gone unless you saved them. Handytool does not log generated values or require an account.
UUID Generator FAQ
What is a UUID?
A UUID (Universally Unique Identifier) is a 128-bit value designed to be unique across all systems without central coordination. UUIDs are the standard way to assign IDs to database records, API resources, and events in distributed systems.
Should I use UUID v4 or UUID v7?
Use v4 for a fully random ID when no ordering is needed. Use v7 as a database primary key — the embedded timestamp makes inserts sequential, improving B-tree index performance significantly at scale.
How likely is a UUID collision?
Effectively impossible. A random UUID v4 has 2^122 possible values. You would need to generate about 2.7 quintillion UUIDs to have a 1-in-a-billion chance of a collision.
Are the generated UUIDs cryptographically secure?
Yes. The generator uses the browser's Web Crypto API (crypto.randomUUID or crypto.getRandomValues), not the weaker Math.random(). UUID v4 is safe for use as session IDs or short-lived tokens.
Can I use UUID v7 for security tokens?
With caution. UUID v7 embeds the creation timestamp, which reveals when it was generated. For long-lived or sensitive security tokens, prefer v4 or a dedicated token format that does not leak timing information.
Are the UUIDs sent to a server?
No. Every UUID is generated locally using the browser's crypto API. Nothing is uploaded, logged, or stored.