windows – Verifying the checksum of a file the easier way?

HashCheck does what you want:

Verifying a file

1. Download a file
2. Download the checksum file, e.g. a .SHA256 file
3. Double click the checksum file in order to check the downloaded file (from step 1)

Here’s how that looks like for a Linux Mint distribution. It has attempted to check all the files, but could only find one of them, because I downloaded only one and not the other two:

Creating checksums for a new file

The other direction is as simple:

1. right click a file (open the context menu in Explorer)
2. choose “Create Checksum file…”
3. Choose the type of the checksum