SHA-256 Hash Generator & File Checksum
Generate cryptographic SHA-256 digests for text strings and verify file integrity checksums in your browser.
How to Use SHA-256 Hash Generator
- Choose your mode: Text SHA-256 Hash or File SHA-256 Checksum.
- For text: type or paste your string to view the real-time 64-character hex hash.
- For files: drop any file into the box to compute its cryptographic hash locally.
- Optionally paste an expected hash into the verify field to confirm authenticity.
Technical Specifications & How It Works
SHA-256 (Secure Hash Algorithm 256-bit) is a cryptographic hash function that produces a unique 256-bit (64-hex character) fingerprint for any input.
This tool uses the browser's hardware-accelerated Web Cryptography API (crypto.subtle.digest) for blazing-fast hashing.
Files never leave your machine: entire documents are read and hashed strictly inside browser memory.
Frequently Asked Questions
Can a SHA-256 hash be reversed to recover the original file?
No. SHA-256 is a one-way mathematical function. It cannot be decrypted back into original plaintext or file data.
Is it safe to verify sensitive files with this tool?
Yes. Files are processed entirely on your local CPU via the FileReader and Web Crypto APIs; zero bytes are uploaded.
Why is checksum verification important?
Comparing checksums ensures a downloaded software installer or document has not been corrupted or tampered with by an attacker.