UUID Generator Online Free — v4 Bulk Generator
Generate cryptographically random UUID v4 (GUID) strings in bulk.
Last Updated: August 2, 2026
UUID v4 uses the browser’s cryptographically secure random number generator.
You May Also Like
JSON Formatter
Format, validate and minify JSON
Open ToolBase64 Encoder
Encode and decode Base64
Open ToolURL Encoder
Encode and decode URL strings
Open ToolHash Generator
Generate SHA-1/256/384/512 hashes
Open ToolUnix Timestamp
Convert timestamps to dates
Open ToolRegex Tester
Test regular expressions live
Open ToolDiff Checker
Compare two texts side by side
Open ToolJWT Decoder
Decode JWT tokens instantly
Open ToolHow to Use Toolza’s Free UUID Generator
Follow these simple steps to get your result in seconds.
Pick a Count
Choose how many UUIDs to generate, from 1 to 1000.
Set Options
Uppercase or lowercase, with or without hyphens.
Generate
Click and your UUIDs appear instantly — securely random.
Copy All
One click copies every UUID as a line-delimited list.
Why Use Toolza’s Free Tool?
Browser-based, private, and completely free — no catches.
100% Private & Secure
Your files never leave your device. All processing happens locally in your browser — no uploads, no servers, no data storage.
Completely Free
No hidden charges, no premium plans, no watermarks. Every feature is free forever.
Works on Any Device
No installation needed. Works on desktop, tablet, and mobile browsers.
No Signup Required
Start using the tool immediately. No accounts, no emails, no personal data.
High Quality Output
Results preserve original quality and formatting.
Lightning Fast
Everything runs locally, so results are instant even for large files.
Why Generate UUIDs?
A UUID (Universally Unique Identifier) is a 128-bit label that you can generate without asking anyone — no central registry, no coordination between systems, no chance of meaningful collision.
Everyday uses
- Databases: Public primary keys that don’t leak record counts like AUTO_INCREMENT does.
- APIs: Resource IDs that work across services without centralized assignment.
- Testing: Unique test data, fixtures, and mock payloads.
- Naming: Collision-free filenames and event identifiers.
Security first
Not all UUID generators are equal. Toolza uses crypto.getRandomValues — cryptographically secure randomness — rather than predictable math-based pseudo-randomness, so generated IDs cannot be guessed.
Frequently Asked Questions
Yes. Toolza’s UUID generator is free forever with no limits.
Yes — v4 UUIDs are built with the browser’s crypto.getRandomValues, the same cryptographic source used for TLS keys.
Statistically no. There are 122 random bits per v4 UUID; generating a billion per second for 100 years still makes collision astronomically unlikely.
Database primary keys, session IDs, order numbers, API resource identifiers, filenames, and tracking events.
v4 is pure random. v1 embeds timestamps, v3/v5 derive from namespaces — v4 is the default for most developers because it needs no coordination.
Only if your storage format requires 32 hex chars. Hyphens are part of the standard format, and some systems expect them.
Explore All Free Tools
Discover all free online PDF, Image, Text, Data, QR, and Developer tools on Toolza.