Runs locally · Zero uploads

File Hash Calculator

Drop a file, get MD5 + SHA-1 + SHA-256 + SHA-512 all at once. Copy any hash with a click.

How it works

A cryptographic hash function takes an arbitrary input and produces a fixed-length fingerprint. The same file always produces the same hash, but even a single bit change produces a completely different output. This makes hashes invaluable for verifying file integrity — confirming a download was not corrupted or tampered with.

This tool computes four of the most common hash algorithms simultaneously: MD5 (128-bit, fast but cryptographically broken), SHA-1 (160-bit, deprecated for security but still used for git commits), SHA-256 (256-bit, current standard for integrity verification and blockchain), and SHA-512 (512-bit, higher security margin). All four are calculated in a single pass over the file using the Web Crypto API and a fallback WASM implementation for MD5.

The results are displayed in a copy-friendly table — click any hash value to copy it to your clipboard. This is useful when you need to verify a downloaded ISO, compare two files, or generate checksums for a release manifest.

The entire computation runs in your browser. Your file is read into memory, hashed, and the bytes are discarded. Nothing is uploaded, logged, or transmitted. Even if you are hashing a file containing trade secrets or personal data, it stays on your machine.

Verify it yourself. Open DevTools → Network → run a conversion. The only requests you'll see are the page assets — your file never leaves this tab.

FAQ

Which hash algorithm should I use to verify a download?

SHA-256 is the current standard. If the download page provides a SHA-256 checksum, compare it against the SHA-256 hash this tool produces. MD5 and SHA-1 are still commonly published but are considered cryptographically weak.

Is MD5 still safe to use?

MD5 is fine for non-security purposes like deduplication, cache keys, or quick integrity checks. It is not safe for security-critical uses (digital signatures, certificate verification) because collision attacks are practical.

How large a file can I hash?

The file is read into browser memory. Files up to several hundred megabytes work on most devices. For multi-gigabyte files, use a command-line tool like sha256sum or the Bytario API which supports streaming.

Why do I get different hashes for the same file?

If the file was re-saved, re-encoded, or metadata was modified, even one byte difference changes the hash completely. Use a binary diff tool to find the difference.