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Hash Generator
Generate SHA256 and MD5 hashes
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🆔UUID Generator
Generate unique identifier codes
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Output
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What is a UUID Generator?
A UUID generator creates Universally Unique Identifiers (UUIDs), which are 128-bit numbers formatted as 32 hexadecimal digits in 8-4-4-4-12 format (e.g., 550e8400-e29b-41d4-a716-446655440000). UUID v4, the most common variant generated by our tool, uses cryptographic randomness to make each ID statistically unique — compliant with RFC 4122.
Why Use Utilo's UUID Generator?
Generate RFC 4122-compliant UUID v4 identifiers instantly
No collision risk — 1 in 340 undecillion chance of duplicate
Generate one or multiple UUIDs at once
Copy-to-clipboard with one click
Toggle uppercase or lowercase formatting
No account or sign-up required
Works entirely in your browser — no network request needed
Frequently Asked Questions
They are the same thing. GUID (Globally Unique Identifier) is Microsoft's term for UUID. Both follow the same RFC 4122 standard format.
The probability is 1 in approximately 340 undecillion (3.4 × 10^38). For all practical purposes, UUID v4 collisions will never occur.
UUID v1 uses the current timestamp + MAC address. UUID v4 uses random numbers only, offering better privacy since it does not embed machine or time information.
Yes, but note that random UUIDs (v4) can cause index fragmentation in B-tree indexes. Sequential UUID formats (like ULID or UUID v7) address this for high-throughput systems.
Yes. Our tool uses window.crypto.getRandomValues for cryptographically secure generation. The output is suitable for production use.