UUID Generator
Generate UUID v1, v4, and v7 identifiers in bulk — with crypto-secure randomness and download options.
Options
Generated UUIDs (1)
Generated locally using your browser's crypto API.
By Vizo ToolLast updated August 20264 min read
UUID Generator — v1, v4 & v7 with Bulk Generation
The UUID Generator produces universally unique identifiers in the three most-used versions: UUID v1 (time-based), UUID v4 (fully random), and UUID v7 (time-ordered random). Generate one or thousands at once, copy them all with a single click, or download them as a file.
Time-ordered UUID v7 values sort chronologically, which is great for database keys and indexes. Everything is generated locally using your browser's crypto API — no network calls, no tracking.
- UUID v1 · v4 · v7
- Bulk generation
- Copy all
- Download as file
Why Use UUID Generator?
v1, v4 & v7 Support
The three most common UUID versions, each with a clear explanation of when to use it.
Bulk Generation
Generate up to 10,000 UUIDs at once for seed data and test fixtures.
Copy All & Download
Copy every UUID to the clipboard or download as .txt, .csv, or .json.
Crypto-Secure
Uses the browser's cryptographic randomness — never Math.random().
Features
UUID v4
Fully random UUIDs — the default choice for most applications.
UUID v1
Time-based UUIDs including timestamp, clock sequence, and node components.
UUID v7
Time-ordered random UUIDs that sort chronologically — ideal for database keys.
Bulk Mode
Set a count up to 10,000 and generate them all instantly.
Multiple Download Formats
Export as .txt, .csv, or .json for use in seed scripts and tests.
Uppercase & Hyphens
Optional uppercase output and hyphen removal via simple options.
How to Generate UUIDs
Generate one or many UUIDs in three steps.
Pick a version
Choose v1 (time-based), v4 (random), or v7 (time-ordered).
Set the count
Generate a single UUID or enter a bulk count up to 10,000.
Copy or download
Copy them all to the clipboard or download as txt, csv, or json.
Frequently Asked Questions
Got questions? We've got answers.
What is a UUID?▼
A UUID (Universally Unique Identifier) is a 128-bit identifier formatted as 36 characters, designed to be unique across all systems without coordination.
Is the UUID generator free?▼
Yes, completely free with no sign-ups or limits.
What's the difference between UUID v4 and v7?▼
v4 is fully random. v7 encodes a timestamp plus randomness, so v7 values sort chronologically — useful for database keys and pagination.
When should I use UUID v1?▼
v1 is time-based with node information. It's rarely recommended today because it can leak timing and machine details; prefer v4 or v7.
Can I generate multiple UUIDs at once?▼
Yes, up to 10,000 at a time in bulk mode.
Can I download the UUIDs?▼
Yes — export as .txt, .csv, or .json files.
Are the UUIDs truly random?▼
v4 and v7 use the browser's cryptographically secure random API, so they're unpredictable.
Why do UUIDs sort weirdly in my database?▼
Random UUIDs (v4) have no ordering. Switch to v7 for chronological sort order.
Can I remove the hyphens?▼
Yes, an option strips hyphens for the 32-character compact form.
Does it work offline?▼
Yes — generation happens entirely in your browser.
Does it work on mobile?▼
Yes, the tool is fully responsive.
Can I use UUIDs as primary keys?▼
Yes, but index them properly. Time-ordered v7 UUIDs typically perform better than random v4 in B-tree indexes.
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