Hash and File Checker.

Check that a download is the real thing. Drop a file or type some text, then compare the hash.

Runs in your browser. Your file is read and hashed here. It is never uploaded.

Check a file What a hash proves

Checker

Fingerprint anything.

MD5, SHA-1, SHA-256, SHA-384 and SHA-512 at once. Paste the hash the publisher gave you and get a clear answer.

Drop a file here, or choose oneUp to about 1 GB. It stays on your device.

Hashes

Uppercase

Nothing hashed yet.

Compare with the hash you were given

The same check on the command line

Windows      Get-FileHash .\file.zip -Algorithm SHA256
             certutil -hashfile file.zip SHA256
macOS        shasum -a 256 file.zip
Linux        sha256sum file.zip

What a hash proves

A fingerprint, not a signature.

Same in, same out

One file, one fingerprint.

Hash the same bytes anywhere and you get the same answer. That makes a hash a quick way to see whether two files are identical.

Tiny change

One byte changes everything.

Flip a single bit and the whole hash looks different. A corrupted download or a tampered installer cannot match the original.

Which one

Use SHA-256 or better.

MD5 and SHA-1 can be forged by an attacker, so they only spot accidents. For anything security related, check SHA-256 or SHA-512.

Trusting a hash from the same page.If an attacker can swap the file, they can swap the hash beside it. Get the hash from a second, trusted place, or check a digital signature.

Thinking a match proves who made it.A hash shows the file is unchanged. It says nothing about who made it or whether it is safe. Signatures do that job.

Comparing by eye.Long strings hide small differences. Paste the hash and let the tool compare it, as above.

LessonEncoding, encryption and hashing Free live toolPassword generator Free live toolBase64, URL and hex