File hashing is something you won't have heard of unless you're a geek or work in IT in business. Essentially, when you're worried about whether (large) files are corrupt or have been tampered with, you can use hashing tools to work out a 'signature' for that particular file, a long hexadecimal number that it would be virtually impossible to mimic, even by changing the original file in a clever way. File Hasher URP is a simple tool for all Windows 10 computers that calculates the industry standard hash values.

From the Store description:

Check the integrity of your files on desktop and phone.

File Hasher is a hash calculator that computes MD5, SHA1 and SHA256 checksums of any file, while allowing to easily compare those against a reference value.

Perfect for making sure a file has not been corrupted or tampered with and requiring no permissions, it is the perfect tool for the security-conscious.

There's not that much to see, but here's File Hasher UWP in action:

Talk about a minimalist UI! A file picker lets you pick a file to inspect and then the three most common industry hash results are shown. 

An extra field at the bottom is marked as 'Check'. The idea is that the expected result of one of the hashes is listed independently somewhere (often on a web page) and you can then copy and paste this into the last field. The application then checks whether this is identical to one of the calculated hashes and puts up a little tick mark if it is. Given that the hashes are long and very complex, this saves time and possible human error and is a nice touch.

You can grab this small UWP app for free here. For Windows 10 Mobile or, indeed, for Desktop/laptop etc.