Imagine this is a browser in a phone
(or any device with a browser for that matter)
In that browser, a tab is open with your average long link
You want to shorten that gibberish, or maybe have to, for whatever reason
If you use a classic URL shortener, you will need to open it in a new tab,
but before that, copy your long link, then go paste it in their input
All in all, it's a lot of work and a bit retroactive for just one action, that is shortening your link.
Using OFFF, all you have to do is type "offf.to/" before the link and hit enter.
You'll then immediately get your short link.