Online Hash Generator — SHA-256, SHA-512, SHA-1 Cryptographic Hash Functions

Our free hash generator creates cryptographic hashes from any text input using SHA-1, SHA-256, SHA-384 and SHA-512 algorithms via the browser's Web Crypto API. All hashing is performed client-side — your input text never leaves your device. Use this tool to generate file checksums, verify data integrity, hash passwords for testing, create digital signatures and understand hash functions for security certifications.

What is a Cryptographic Hash Function?

A hash function is a one-way mathematical algorithm that converts any input (text, file, data) into a fixed-length string of characters called a hash or digest. Key properties:

• Deterministic — the same input always produces the same hash
• One-way — you cannot reverse a hash to get the original input
• Avalanche effect — changing even one character completely changes the hash
• Collision resistant — it is computationally infeasible for two different inputs to produce the same hash

SHA-256 vs SHA-512 vs SHA-1 — Which Should You Use?

• SHA-1 (160-bit) — Deprecated. Collision attacks are known. Do not use for new systems. Still seen in legacy SSL certificates and Git commit hashes.
• SHA-256 (256-bit) — Current standard. Used in TLS 1.3, HTTPS certificates, Bitcoin, code signing, and most modern security protocols.
• SHA-384 (384-bit) — Used in high-security government and financial systems.
• SHA-512 (512-bit) — Maximum security. Used for password hashing (with salt) and long-term data integrity verification.

Common Uses for Hash Generators in IT

• Verifying file integrity after download (comparing published checksums)
• Storing passwords securely in databases (always use bcrypt or Argon2 with salt for passwords — not raw SHA)
• Creating digital signatures and certificates
• Data deduplication in backup systems
• Generating ETag headers in web servers
• Blockchain and cryptocurrency transaction verification