Last updated: October 2026
UUID generator v4 free online — bulk, crypto-grade, no signup
Short answer: pick v4 (random) or v7 (time-ordered), set how many you need up to 1,000, and click Generate UUIDs — each ID is built with your browser's cryptographic randomness, with uppercase, no-hyphen and brace formats available. Copy all or download as .txt. No signup, nothing uploaded.
How it works
1. Choose the version: v4 for purely random IDs, v7 when the IDs will live in a database index (v7 starts with the current timestamp, so new rows sort naturally and indexes stay fast). 2. Set the count (1–1,000) and tick any format options — UPPERCASE, no hyphens, or {braces} for .NET-style GUIDs. 3. Click Generate UUIDs, then copy all or download the batch.
Randomness comes from crypto.getRandomValues (and crypto.randomUUID for v4 where available) — the same cryptographic source operating systems use — never Math.random. Because generation happens locally, no one else can see, log or predict your IDs.
When you need this
Seeding a database with test rows, generating API keys or session identifiers, creating unique filenames for uploads, or producing correlation IDs for distributed tracing — anywhere a "probably never repeats" label beats an auto-incrementing number. Bulk mode plus the .txt download covers fixtures and migrations in one step.
Frequently asked questions
What is a UUID?
A UUID (Universally Unique Identifier) is a 128-bit label like 550e8400-e29b-41d4-a716-446655440000, used as database keys, session IDs and API identifiers. Version 4 UUIDs are random; version 7 UUIDs embed a timestamp so they sort in creation order.
Should I use UUID v4 or v7?
Use v4 when you just need a random unique ID. Use v7 when the IDs go into a database index — because v7 starts with the current timestamp, new rows sort naturally and indexes stay fast. Both are generated here with crypto-grade randomness.
Are these UUIDs really random?
Yes. Generation uses your browser's crypto.getRandomValues (with crypto.randomUUID for v4 where available) — the same cryptographic randomness operating systems use, not Math.random. Nothing is sent anywhere, so no one else can see or predict your IDs.
How many UUIDs can I generate at once?
Up to 1,000 per click. Set the count, choose your format options, and download the whole batch as a .txt file.
Is it private?
Completely. UUIDs are generated locally in your browser — no server, no logging, no tracking. You can even run this page offline after it loads.
