Simply drop a file into iHash to obtain the hash of the file. This app is great for check file integrity that downloaded from the internet. It's easy, it's fast and it works. You can drop big files. It allows you to verify that downloaded files are not corrupted or otherwise unusable before you burn them to disc or host them on your file server.
You can verify a file downloaded from the Internet. Before you send a file to someone else, you can calculate the file hash code, and then publish it so that others can verify that the received file is complete and unchanged.