SuperNZB is a free download that includes a free SFV file checker.
Download SuperNZB for Windows
Download SuperNZB for Macintosh
(SuperNZB runs on Windows 8, 7, Vista, XP, and all versions of Mac OSX.)
Once you have SuperNZB installed, just click the “SFV” button on the main window:
The screenshot above was made on Windows, however the program looks identical on the Macintosh.
Here is a 5 minute demo video:
We provide this free SFV checker to promote SuperNZB.