File Hash Verifier (Checksum Tool)

File Hash Verifier (Checksum Tool)

Compute SHA-256, SHA-1, SHA-384 or SHA-512 checksums for any file and compare them against an expected value — right in your browser. Verify that a download wasn't corrupted or tampered with. The file never leaves your device. Free, private, no sign-up.

What a file checksum proves

A hash (or checksum) is a fixed-length fingerprint of a file. Change even a single byte and the hash changes completely. Software authors publish the expected checksum next to a download so you can confirm the file you received is byte-for-byte identical to the one they released — catching corruption during transfer or, more importantly, tampering by a malicious mirror.

How to use it

Three quick steps:

• Choose or drag in the file you want to verify.
• Pick the algorithm (SHA-256 is the usual choice).
• Optionally paste the expected checksum to get an instant match/no-match verdict.

Everything stays on your device

The hashing is done locally with the browser's built-in Web Crypto API. Your file is read into memory and processed on your machine — it is never uploaded to any server. That means you can safely verify private files and even very large files without waiting on a slow upload.

Which algorithm should you use

Match whatever the file's publisher used. <strong>SHA-256</strong> is the modern default and a safe choice for almost everything. <strong>SHA-512</strong> and <strong>SHA-384</strong> are stronger variants. <strong>SHA-1</strong> is offered only because some older projects still publish SHA-1 checksums — it's considered weak for security, so don't rely on it for tamper detection when a stronger option exists.

Reading the match result

When you paste an expected checksum, the tool compares it against every hash it computed and tells you clearly whether it matches. A match means the file is authentic and intact. A no-match means the file differs — it could be corrupted, a different version, or altered — so don't run or trust it until you understand why. Make sure you're comparing the same algorithm the publisher used.

Related tools

Checksums verify integrity but not identity — that's what code signing and certificates do. To hash short text instead of files, use our SHA-256 / MD5 hash generators. To create random values for tokens or keys, try our Secure Token Generator. Everything runs client-side with nothing stored.

FAQ

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