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About UUID Generator & Validator (v4 & v7)
Generate bulk cryptographically secure UUID v4 identifiers or modern timestamp-ordered UUID v7 keys directly in your browser.
Validate existing UUID strings, detect hyphenation and compact formats, and extract embedded Unix epoch timestamps from v7 identifiers.
How to use this tool
- 1Choose the number of UUIDs to generate (1 to 100).
- 2Select UUID version: v4 (random RFC 4122) or v7 (timestamp-ordered RFC 9562).
- 3Select casing (lowercase or UPPERCASE), hyphenation, and layout structure (list, JSON array, SQL VALUES).
- 4Paste an existing candidate UUID to inspect its version, variant, and creation timestamp.
Understanding the result
UUID v4 provides 122 bits of cryptographic entropy, making collisions virtually impossible.
UUID v7 packs a 48-bit millisecond timestamp in the high bits, preventing index fragmentation in B-tree database indexes.
Important limitations
- UUID generation relies on the client system entropy pool via the Web Crypto API.
- Timestamp extraction is applicable only to time-based UUID standards (v1, v6, v7).
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Frequently asked questions
Why choose UUID v7 over UUID v4?
UUID v7 identifiers are monotonically ordered by creation timestamp, which drastically improves database indexing performance and clustering compared to random UUID v4.
Are generated UUIDs cryptographically secure?
Yes. All random bits are produced by the browser Web Crypto API (crypto.getRandomValues).
Can I generate UUIDs without hyphens?
Yes. Select compact formatting to emit 32-character hexadecimal strings without dashes.
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