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UUID Generator (Free) - RFC 4122 v4

Choose count → Generate → Copy. Cryptographic-quality v4 UUIDs for databases, APIs, and tests - up to 50 per run, optional uppercase hex. No upload, no signup, no watermark.

UUID generator controls and results

Need a primary key, request ID, or seed row? One tap gives standard UUID v4 strings - the kind Postgres, MySQL, and REST APIs expect.

1 Count & options · 2 Generate UUID · 3 Review IDs · 4 Copy or regenerate

Your UUIDs

Count 1-50 per click. Uppercase hex is cosmetic (RFC examples use lowercase). Each click replaces the panel - use Copy UUIDs before regenerating if you need the previous set.

Runs in this tab only-no server upload, no signup, no watermark.

Tap Generate UUID - your v4 appears here large, with a short explanation and next steps. Nothing is uploaded.

Next: QR code · Random string · Password · All generators · All tools

  • Works in your browser-runs on your device, not our servers
  • No upload required-your input stays in this tab
  • Free and instant
  • No account needed
  • Private by default-the same ProToolbox promise on every page

What this is for

UUID Generator (Free) - RFC 4122 v4 builds values you can copy: free and instant, works in your browser, no account needed. Passwords, UUIDs, QR codes, barcodes-regenerate when rules or batch size change.

  • New batch when policy or environment shifts
  • Pin the tab during QA and fixture refreshes
  • Local generation
  • Staging seeds, mocks, and load-test data

Fit: Test inputs and assets without installing another app.

Bookmark this tab - devs and QA reach for UUIDs all day. One fast page beats hunting through docs or ad-heavy sites.

When this beats guessing IDs

You are wiring REST handlers, migrations, fixture data, or correlation IDs and want identifiers that match RFC 4122 without pulling in a library or hitting a remote service. This tool is optimized for generate → copy → paste - large first value, batch list when count > 1, and a copy button for the whole set.

How it works

  1. Set Count (1-50) and optional Uppercase hex.
  2. Click Generate UUID - v4 values use crypto.getRandomValues when your browser supports it.
  3. Read the violet panel: big hero ID, scrollable list for batches, What this is, and Next.
  4. Click Copy UUIDs - newline-separated text for spreadsheets, SQL, or env files.

Privacy: UUID generation runs locally in your tab. We do not receive your count, options, or generated values.

FAQ

  • Are these real v4 UUIDs? Yes - version nibble 4 and RFC variant bits; 122 random bits from a secure source when available.
  • Is anything uploaded? No - generation stays in your browser.
  • Production-safe? UUID v4 is standard for keys and tracing; follow your org’s rules for regulated data.
  • Why optional uppercase? Some teams prefer A-F for readability; APIs usually accept either case.
  • Mobile? Yes - the layout stacks; copy uses the same clipboard flow as desktop.

Save this page-random tools are handiest when they are one tap away.

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