File Checksum & Hash Calculator
Verify file integrity by calculating MD5, SHA-1, SHA-256, and SHA-512 checksums entirely in your browser without uploading.
1 How to Use the File Checksum & Hash Calculator
Drag & drop any file into the upload zone or click to select from your device.
The browser computes cryptographic hashes in chunks using FileReader and Web Crypto.
Compare with the official checksum by pasting it into the 'Verify Match' box.
Get an instant green match confirmation or red mismatch alert.
2 Technical Specifications
| Specification | Details & Capabilities |
|---|---|
| Processing | 100% Client-Side streaming via HTML5 FileReader (0 bytes uploaded) |
| Algorithms | SHA-256, SHA-1, SHA-512, MD5 |
| Max File Size | Up to 2GB supported directly in browser memory |
| Checksum Matching | Case-insensitive hex comparator |
Trust and Privacy
100% Client-Side Privacy Guarantee
All calculations run directly in your local browser memory. Zero data is ever transmitted, logged, or stored on remote servers.
4 Frequently Asked Questions
Q. Is my file uploaded to your server?
Absolutely not. The file never leaves your computer. The Web Crypto API streams the file byte-by-byte in your browser's private memory sandbox.
Q. How does checksum verification protect me?
Software developers publish checksums so users can verify that their downloaded installer has not been tampered with by hackers or corrupted by a faulty network download.