CodeCraft

Hash Generator

SHA-1 / SHA-256 / SHA-384 / SHA-512, computed locally with Web Crypto API.

How to Use

  1. Paste or type the text you want to hash into the input box.
  2. Select an algorithm: SHA-256 is the most common, SHA-512 offers higher security.
  3. Click Compute Hash — the result is shown as a hex string.
  4. Click Copy or select the result box text to copy it.

About Hash Generator

Cryptographic hash functions transform input data of any length into a fixed-size digest. Common algorithms include MD5 (128-bit, deprecated for security use), SHA-1 (160-bit, deprecated), SHA-256 (256-bit, widely used), and SHA-512 (512-bit, high security). Hash functions are one-way -- you cannot reverse a hash to get the original data. They are used for verifying file integrity, storing passwords securely (with salting), digital signatures, and generating unique identifiers. This tool uses the Web Crypto API built into your browser, so no data is sent to any server -- all hashing is done locally.

Use Cases

Password Storage Verification

Hash passwords before storing to verify login attempts without exposing plaintext credentials.

File Integrity Checks

Compare SHA-256 hashes of downloaded files against published checksums to detect corruption or tampering.

Digital Signatures

Hash documents before signing to create compact, fixed-length representations for cryptographic signatures.

Content Deduplication

Generate hashes of file contents to quickly identify duplicates without byte-by-byte comparison.

Examples

Input
hello
Output
SHA-256: 2cf24dba5fb0a30e26e83b2ac5b9e29e1b161e5c1fa7425e73043362938b9824

The same input always produces the same hash. Even a tiny change (e.g., 'Hello') produces a completely different output.

Input
hello
Output
SHA-1: aaf4c61ddcc5e8a2dabede0f3b482cd9aea9434d

SHA-1 produces a 160-bit (40 hex chars) digest. Note: SHA-1 is considered weak for security purposes.

Common Pitfalls & Edge Cases

  • ⚠SHA-1 and MD5 are broken for security use (collision attacks exist). Use SHA-256 or SHA-512 for security-sensitive applications.
  • ⚠Hashing is one-way: you cannot reverse a hash to get the original input.
  • ⚠For password hashing, use dedicated algorithms (bcrypt, scrypt, Argon2) — not raw SHA. They add salt and iteration cost.
  • ⚠Hash output length is fixed regardless of input size: SHA-256 always outputs 32 bytes (64 hex chars).

🔒 Data Privacy

All hash computation uses the Web Crypto API in your browser. Your text never leaves your device.

Standards & References

Frequently Asked Questions

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