Every modern application needs unique identifiers — for database records, session tokens, file upload names, request correlation IDs, test data fixtures, and API resource identifiers. UUIDs (Universally Unique Identifiers, also called GUIDs in Microsoft contexts) are the standard solution: 128-bit identifiers formatted as 8-4-4-4-12 hexadecimal groups that are statistically guaranteed to be unique across all space and time without any central coordination authority. UUID v4 — the most widely used variant — is entirely randomly generated using cryptographic randomness. The Utility Spark UUID Generator uses the browser's crypto.randomUUID() method (or crypto.getRandomValues() as a fallback) to produce RFC 4122-compliant UUID v4 identifiers. Generate one at a time or in bulk batches. Output in standard hyphenated format or compact no-hyphen format. Everything runs in your browser — no network request, no central UUID registry, no API key required.
lightbulb When to use this tool
- check_circle Generating a unique primary key before inserting a new record into a database that uses UUIDs as identifiers.
- check_circle Creating test fixture data that needs unique identifiers — user IDs, order IDs, session tokens — for unit tests or integration test setups.
- check_circle Generating a unique name for an uploaded file to prevent filename collisions in a storage bucket.
- check_circle Creating a unique correlation ID to trace a request through a distributed system's logs.
- check_circle Generating multiple UUIDs at once for seeding a database with test data.
Why use our tool?
Cryptographically Random — Uses crypto.randomUUID()
UUID generation uses the browser's crypto.randomUUID() method (RFC 4122 compliant, available in all modern browsers) which derives randomness from the operating system's cryptographically secure entropy pool. The resulting identifiers are statistically indistinguishable from random — not predictable sequences or time-based IDs that could be guessed.
Bulk Generation — 1 to 100 UUIDs at Once
Set the quantity to generate 1, 10, 50, or up to 100 UUIDs in a single click. The output displays as a list, each on its own line, ready to copy as a batch for test fixtures, data seeding scripts, or bulk identity generation.
Standard and Compact Format
Standard UUID format: 550e8400-e29b-41d4-a716-446655440000 (with hyphens). Compact format: 550e8400e29b41d4a716446655440000 (no hyphens, 32 hex chars). Some systems (legacy databases, certain APIs) prefer the compact format. Toggle between them without regenerating.
One-Click Copy for Single or All
Copy a single UUID from the list, or copy all generated UUIDs at once as a newline-separated list for pasting into code, a SQL VALUES clause, or a test data file.
Zero Server Dependency
UUID generation requires no API call, no central registry, and no server. The cryptographic randomness is sourced entirely from your device's hardware entropy. The tool generates valid, unique identifiers even when your device is offline.
How it works
Set the quantity of UUIDs to generate (default: 1, max: 100).
Select the output format: standard hyphenated (RFC 4122) or compact no-hyphen.
Click 'Generate UUID(s)' — the output appears immediately.
Click 'Copy' next to any individual UUID, or 'Copy All' to copy the entire batch.
Click 'Generate' again to produce a fresh set — each generation produces entirely new, independent identifiers.
Examples
science Single UUID for Database Record
Use case: Generate a primary key before inserting a new user record
Output: 7b5e8e40-2a3d-4f6b-9c1d-8e7f3a2b0c5d
SQL usage: INSERT INTO users (id, email) VALUES ('7b5e8e40-2a3d-4f6b-9c1d-8e7f3a2b0c5d', 'user@example.com')
science Bulk UUID Generation for Test Fixtures
Quantity: 10
Use case: Seeding a test database with 10 unique order IDs
Output: 10 UUIDs, one per line, copy-paste into your test fixture JSON or SQL seed file