UUID v4 generates pseudo-random identifiers with 122 bits of cryptographic entropy. UUID v7 combines a millisecond-precision Unix timestamp with random bits, making identifiers time-ordered and significantly improving database B-tree indexing and insertion performance.
SECURITY & CRYPTO·Client-Side (100% Private)
UUID, ULID & NanoID Generator
Generate and inspect cryptographically random UUID v4, time-sortable UUID v7, ULID, NanoID, and Snowflake identifiers in bulk.
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FREQUENTLY ASKED QUESTIONS
Frequently Asked Questions about UUID, ULID & NanoID Generator
Quick answers to common questions about usage, conversion rules, privacy guarantees, and best practices.
What is the difference between UUID v4 and UUID v7?
Can two randomly generated UUIDs ever collide?
While mathematically possible, a collision in UUID v4 is practically impossible. The odds of generating duplicate UUID v4 values require generating billions of identifiers every second for thousands of years.
How do hyphenated and unhyphenated UUID formats differ?
Standard UUIDs are formatted in five groups separated by hyphens (8-4-4-4-12, total 36 characters). Unhyphenated (compact) UUIDs remove hyphens into a continuous 32-character hex string frequently used in database keys or URL paths.
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