File Checksum Generator

A checksum is a fixed-length fingerprint computed from the contents of a file. Any change to the file — even a single bit — produces a completely different checksum. Checksums are used to verify that a download was not corrupted or tampered with during transfer, and to confirm that two files are bit-for-bit identical.

For verifying downloads and general integrity checks, SHA-256 is the best all-purpose choice: it is fast, hardware-accelerated, and cryptographically strong. MD5 and SHA-1 are faster but have known collision weaknesses, so they should not be used where an attacker could deliberately craft a matching file. The tool computes MD5, SHA-1, SHA-256, and SHA-512 so you can match whatever checksum a publisher provides.

No. Every checksum is computed inside your browser using the Web Crypto API and a built-in pure-JavaScript MD5 implementation. Your files never leave your device — the tool works fully offline and is safe for hashing sensitive documents.

Drop the downloaded file into the tool, note its SHA-256 (or whichever) checksum, then paste the checksum published on the website into the "Expected checksum" box and press Compare. A green Match badge means the file is authentic and intact; a red Mismatch means it was corrupted or modified.

Against accidental corruption, yes — MD5, SHA-1, SHA-256, and SHA-512 all detect any change reliably. Against a deliberate attacker, you should use a collision-resistant hash such as SHA-256 or SHA-512 (never plain MD5 or SHA-1) and obtain the expected checksum from a trusted, ideally separate, channel.

The file is read into memory as a binary buffer and hashed in one pass per selected algorithm. Files of tens of megabytes complete almost instantly; extremely large files may take a few seconds. For multi-gigabyte files, consider hashing on your own machine with a native tool for speed.