How to use this tool & why it helps

A file hash (or checksum) is a digital fingerprint: a short string that uniquely represents the contents of a file. If one bit changes, the hash changes. Developers and security professionals use hashes to verify that a downloaded file (e.g. software, ISO) has not been tampered with. This tool uses the Web Crypto API in your browser: you select a file, and the browser reads its bytes and computes SHA-256, SHA-512, or MD5 locally. No file is uploaded to any server—your file never leaves your device.

Choose the algorithm (SHA-256 is recommended for security; MD5 is legacy but still used in some contexts). Select your file via the file picker. The hash appears in seconds. Compare it with the hash published by the software vendor or source to verify integrity. SHA-256 and SHA-512 are computed with the browser's built-in crypto.subtle.digest; MD5 is computed with a small client-side implementation.

Verifying file integrity is essential before installing software or opening sensitive documents. This free tool is private, requires no sign-up, and runs entirely in your browser. Use it for downloads, backups, or any scenario where you need to confirm that a file has not been altered.