Generate UUIDs (v4, v7) and ULIDs in bulk. Configurable quantity and format options. Cryptographically strong generation in your browser.
Open UUID Generator → free, no sign-inUUIDs are the standard format for unique identifiers in software: database primary keys, session tokens, entity references. UUIDv4 is random; UUIDv7 is time-sortable. ULIDs are a more recent alternative with lexicographic sortability. The UUID Generator produces any of these in bulk — configurable quantity, multiple format options — using cryptographically secure generation.
Developers seeding databases with unique IDs, generating test identifiers, setting up fixtures, or building any system that needs unique, non-sequential identifiers.
No tutorials. No learning curve. Open it and get started.
No server uploads. Supports UUIDv4, UUIDv7, and ULID — covering both traditional and modern unique identifier formats.
Completely free. No trial period. No premium tier for basic functionality. No account required. Use it as often as you need.
One job, done well. UUID Generator was built to solve a specific problem cleanly. No feature bloat, no ads, no distractions.
What is the difference between UUIDv4 and UUIDv7?
UUIDv4 is completely random. UUIDv7 is time-sortable — the first bits encode the timestamp, making UUIDv7 useful as database primary keys because they sort chronologically.
What is a ULID?
Universally Unique Lexicographically Sortable Identifier — 26-character, case-insensitive, time-sortable. An alternative to UUID with better sortability.
Is the generation cryptographically strong?
Yes — uses window.crypto.getRandomValues() throughout.
Can UUIDs ever collide?
Theoretically yes, but with 2^122 random bits in UUIDv4, the probability is effectively zero in practice.
Should I use v4 or v7 for database IDs?
UUIDv7 is better for database primary keys — sequential UUIDs reduce B-tree fragmentation and improve query performance.
Free. Instant. No sign-in. Open it and get the job done.
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