UUID Generator

Generate cryptographically secure UUIDs in v4 (random), v1 (time-based), v5 (name-based), or ULID (sortable) formats. Bulk generate up to 100 at once. Format options include uppercase, removing dashes, and adding braces. Includes a UUID validator.

UUID Versions

UUID v4 (Random): Most common — 122 bits of random data. Cryptographically secure. Ideal for database keys, session IDs, and general unique identifiers.

UUID v1 (Time-based): Based on timestamp and MAC address. Sortable by creation time. May reveal system information. Use when order matters.

UUID v5 (Name-based): SHA-1 hash of namespace + name. Deterministic — same input produces same UUID. Use for generating consistent IDs from namespaces.

ULID (Universally Unique Lexicographically Sortable Identifier): 26-character string with timestamp (48 bits) and randomness (80 bits). Sortable by creation time. URL-safe, no hyphens.

Format Options

Uppercase: All letters in uppercase (e.g., 123E4567-E89B-12D3-A456-426614174000). No dashes: Remove hyphens for compact representation (e.g., 123e4567e89b12d3a456426614174000). Braces: Wrap in curly braces { } for some systems.

Bulk Generation

Generate up to 100 UUIDs at once. Copy all to clipboard or download as JSON/CSV. Useful for test data generation and database seeding.

UUID Validator

Check if a string is a valid UUID. Identifies which version (v1-v5) the UUID belongs to. Validates format and checksum where applicable.

Use Cases

Database primary keys: UUID v4 for distributed systems. API request IDs: ULID for sortable tracing. Consistent IDs: UUID v5 for deterministic generation. Test data: Bulk generation for unit tests.