What good, free apps are available for web clipping?

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Hello,

I use Google Keep as my note taking app.

Now I want to have an app(free) which helps me to copy texts from a website (I am not sure, but I think it is known as web clipping) and save it for later.

The main purpose is to improve my English vocabulary so, if I see a text with words unkown to me, then I want to save that sentence to read it again for later which will develop my knowledge of the word better as just knowing the meaning is not very helpful in retaining the word and its meaning.

Also, if the app can be used offline, it would be great!

Improving my English vocabulary for exams like GRE and other competitive exams is another task, so if anyone can guide me how to prepare for it and what sources I can use to benefit me?

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