We provide a free, simple to use API that allows you to obtain the MD5 hash/checksum of any online file regardless of its type and without the need to download the actual file.
MD5 hashes have multiple applications and thanks to this service, you now have this capability, client-side, in every browser (even IE6).
If you would like to learn how to use this service, please have a look at the How To section or if you are feeling hardcore, jump directly to the API.
Finally, we have also put together a demo that shows this service in action.
Enjoy!