See exactly
where files diverge.

Drop a file, get its cryptographic print, and compare it byte for byte against what it's supposed to be. Nothing ever leaves your browser.

Drop a file here, or click to choose one

Hashing happens entirely on your device

Computed hash

—

Visual print

each bar is one byte of the digest — a unique shape for this exact file

Compare against an expected checksum

Expected print

Identify this hash

Check this fingerprint against a small built-in reference list — flagged test-malware signatures and recognized known-safe files. This runs entirely offline; nothing is sent anywhere.

Coverage is intentionally limited to keep every check fully local. Broader databases like MalwareBazaar or NSRL exist, but querying them means sending the hash to a third party — a trade-off this tool doesn't make by default.

How it works

Drop the file

Your browser reads the file into memory. It's never sent anywhere — there's no server in this loop.

It gets hashed

The Web Crypto API built into your browser computes a SHA fingerprint unique to those exact bytes.

You compare it

Paste the checksum from a source you trust. If a single byte differs, you'll see exactly where.

Nothing is uploaded, ever

Every hash on this page is computed inside your browser's built-in crypto engine. Open your browser's network panel while you use it — you'll see it stay silent.