Verify a File Wasn't Corrupted or Tampered With
This file checksum calculator lets you verify file integrity the moment a download finishes, right in your browser. Software installers, ISO images, and archive files are commonly published alongside an official checksum specifically so you can confirm the copy on your machine matches the original byte-for-byte, catching a corrupted download, an interrupted transfer, or a tampered file before you run it. Use it as a straightforward file hash checker: drop the file, get all four common hash algorithms at once, and compare against whatever the publisher listed.
How to Use This File Checksum Calculator
Drop a file onto the upload area, or click to browse, hashing starts instantly and never leaves your browser. All four checksums, MD5, SHA-1, SHA-256, and SHA-512, appear as soon as they finish computing. To verify file hash values against a published one, paste it into the Verify field, the matching algorithm is detected automatically and highlighted green on a match, red if nothing matches.
MD5 vs SHA-1 vs SHA-256 vs SHA-512: Which Should I Compare?
Use whichever algorithm the publisher actually listed, comparing a mismatched pair of algorithms proves nothing. SHA-256 is the modern default for verify download integrity checks, most current software distributions publish it specifically. MD5 and SHA-1 are cryptographically broken for security purposes (an attacker can deliberately construct a different file with the same hash), but they're still genuinely useful to compare file hash values for detecting accidental corruption, since a randomly damaged file won't coincidentally collide. This sha1 sha256 sha512 calculator computes all three, plus MD5, so whichever one you have to check against, it's already there.
Why the Verify Field Matches Any Algorithm Automatically
Paste any hash into the Verify field, whether it's an md5 checksum online value, a sha256 checksum verify string, or a SHA-1/SHA-512 digest, and this checksum verification tool checks it against all four computed values at once rather than making you pick the algorithm first. The length of the pasted string alone doesn't reliably tell you which algorithm was used since some outputs share length characteristics in edge cases, an exact match against the real computed value is a more reliable signal than guessing from length.