As you might expect from the name, the website at www.smallpdf.com really does only one thing, though it does it very well. It makes a PDF file smaller.
This can be useful if, say, you have a large PDF file that you need to email to someone, or perhaps you have a large collection of files which you don't want to get rid of but which is taking up a lot of space on your hard disk. I have a few dozen books in PDF format which I regularly refer to, for example, so it's handy to be able to reduce the size of the collection without any noticeable loss of quality.
In a typical test that I undertook, the system managed to reduce the size of my PDF file from 7.9 MB to 3.9 MB, which is a reduction of more than 50%.
The system is entirely web-based, so there's nothing to install. Just visit www.smallpdf.com and drag a file from your desktop to the browser. Once the file is uploaded, it'll be converted straight away, and you can then download the new version.
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