Often when you copy and paste certain texts from internet to office document and then click all the text and justify it(align text to both left and right side margins) it makes no difference at all, like you didn't click justify at all.

I was wondering:

1.Why this happens?
2.How can you fix this automatically instead of manually?
Obviously if you do it manually it is extremely time consuming, you would have to press delete on empty space to get the next line, then click on the end of the line, press delete again and so on, it is grueling beyond belief.

There must be an elegant way to do this instead of that...

P.S.
Also I was wondering if anyone knows of a freeware software that automatically merges multiple html pages into one and/or converts that page into text document?