Thank you for your review
Email me when discounted: 
Checksum Validator is a simple to use utility to calculate and validate checksums (SHA-1 or MD5 digests) for files that you download (or will upload). By comparing a site's published checksum with your calculated checksum, you can verify that your download matches the site's "official" copy; free from corruption or tampering (unless the site's checksum was also tampered with). Everything needed to calculate checksums is in Mac OS X, this is just much easier and quicker, and let's face it, the easier and faster, the more likely we will actually verify our downloads.


  • Mac OS X 10.4 or later

Similar Software

Open Comparison
Suggest Other Similar Software
Leave a Review

Checksum Validator User Discussion

Nobody has reviewed or commented on this app yet. Add your own comment and get a discussion going!
Sort by: Time | Smiles
GeoProf Member IconReview+880

Still works in Mountain Lion 10.8.3! Thanks dev.

Reply0 replies
Version 1.0.0
southpawami Member IconComment+29

Well... it's simple. It in does what it is supposed to do. If you're being lazy with *nix reading, it's another utility that doesn't require shell knowledge.

The rough is this... you drag and drop an unmounted dmg file in a little square box that appears after you open it. A box pops up with the SHA-1 calculated checksum and a little radio button you can click on MD5 to show that checksum instead.

Then, you cut and paste the checksum that you found posted where you downloaded it from into the empty box. Press enter and it tell you either... it's not the right length... that is... you made a mistake cutting and pasting by one letter... it matches... or it doesn't match.

The whole process requires as little knowledge as could be possible for a person wanting to check a checksum manually.

(for those that don't know what a checksum is... or why it's important... i'll try to explain. Say you just spent the last 3 weeks making a program of yours oh-so-sweet. Now, you upload it to your website for others to be able to use it. A person with too much time on there hands thinks it'd be the funniest thing in the world to modify your oh-so-sweet program so that the pictures of the logos now have naked women or hentai with some voice. Well... since you aren't catering to that clientele you might find yourself in a difficult place, right? Hence... checksums are mathematical equations that prove.. 'if they match' that the program/item hasn't been tampered with. Someone out there is saying... why not just tamper with both the program and the displayed checksum. Well... besides other things... that involves a whole lot more work and effort which is fairly pointless since most people don't check the checksums anyway.)

Reply0 replies
Version 1.0
There are no Ratings for this App yet.
> 5 1


Current Version (1.x)


Downloads 4,255
Version Downloads 1,525
License Free
Date 08 Mar 2007
Platform OS X / PPC 32 / Intel 32
Price Free
Learn how MacUpdate Desktop makes installing apps from MacUpdate.com one-click easy.
Next time, install Checksum Validator with 1-click

Learn how MacUpdate Desktop can install apps on MacUpdate with the simple click of the Install apps with MacUpdate Desktop icon. Plus, keep all your apps updated. Play video...