UUID & Hash Generator
Generate cryptographically random UUID v4 identifiers and compute SHA-1, SHA-256, SHA-512 hashes. All processing runs locally in your browser.
🔑 UUID v4 Generator
🔒 Hash Generator
What Is a UUID?
A UUID (Universally Unique Identifier) is a 128-bit value used to uniquely identify information in computer systems. UUID v4 is randomly generated, making collisions astronomically unlikely. They are widely used as primary keys in databases, session tokens, file names, and API resource identifiers.
🔒 Hash Functions
A cryptographic hash function takes an input and produces a fixed-size digest. SHA-256 and SHA-512 are part of the SHA-2 family, widely used in security applications, digital signatures, and data integrity verification. Note: this tool uses the native Web Crypto API — no data is ever sent to a server.
❓ Frequently Asked Questions
UUID v4 uses cryptographically random bits from crypto.getRandomValues(). The probability of generating two identical UUIDs is so small it is considered negligible for any practical purpose.
No. Cryptographic hash functions are one-way — it is computationally infeasible to reverse SHA-256 or SHA-512 to recover the original input.
Yes. All hashing runs 100% in your browser using the built-in Web Crypto API. Your input text is never transmitted anywhere.