UUID/ULID Generator

Random ID Generator - UUID v4 / ULID

Generate UUID v4 or ULID with one click. Supports bulk generation (up to 100), uppercase/lowercase and hyphen options. Uses cryptographically secure random numbers, all processing runs in your browser.

UUID vs ULID - Differences and Use Cases

What is UUID v4?

UUID (Universally Unique Identifier) is a 128-bit unique identifier standardized by RFC 4122. Version 4 is randomly generated, with 122 bits of randomness. Format: xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx

What is ULID?

ULID (Universally Unique Lexicographically Sortable Identifier) was designed to address UUID's limitations. It encodes a 48-bit timestamp and 80-bit random data using Crockford's Base32.

Comparison Table

FeatureUUID v4ULID
Length36 chars (with hyphens)26 chars
SortableNo (random)Yes (chronological)
EncodingHexadecimalCrockford's Base32
TimestampNot includedIncluded (ms precision)
StandardRFC 4122Unofficial spec
SupportNearly all languages/DBsLimited
Best forGeneral-purpose IDsTime-series data IDs

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