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Today there is another tip like "tested for years and found to be good!". The Mac app that I would like to recommend to you is called Lightweight PDF and is available for free in the Mac App Store. Don't worry: In this case, free actually means permanently free and also free of advertising. You don't even have the opportunity to donate anything. Although I would really like to do that, since the app has often successfully calculated PDF files smaller for me.
But well, the developers seem to earn their money with software that can be used to do surveys and the Lightweight PDF tool seems to run invisibly alongside, since it doesn't even run on your website is called.
When you start the app, only a small window opens into which you can drag and drop your PDF file (s). The software then immediately starts converting and within a fraction of a second (my files were always max. 30 MB in size) a message appears that not only informs you that the work is finished, but also shows how many percent smaller the PDF has become is.
In my experience, the values for savings are between 30 and 70 percent. In exceptional cases it went up to 80 to 90 percent, but the tool mainly achieves this if you have embedded image data that is much too large in the PDF.
If you read the description of the app in the store, you will find three 5-star ratings and two 1-star ratings. I am always particularly interested in them, because this is where the points of criticism people have with the tool often appear.
In one case there was a bad rating because Lightweight PDF apparently did not save any space. The only way I can explain this is that the files were not edited, because over the years I haven't had a single file that hasn't gotten smaller.
The second point of criticism is that the software replaces the original file with the reduced version - without warning. This is useful in most cases, as it means you don't have more files than before, but it can of course be bad if you don't want to change the original. In that case I always make a duplicate with CMD + D before I throw the PDF into the tool. You just have to know.
A small note from me: Sometimes - when you drag a lot of files or a large file with several hundred megabytes - onto Lightweight PDF, the software sometimes crashes.
I can only call the app an insider tip. It's small, free, and very effective at shrinking PDF files. I recently had a folder with scans (from my ScanSnap iX500) for mortgage lending. Since the documents should all be uploaded to the bank online, I dragged the entire folder onto Lightweight PDF and within seconds, over 100 PDFs were reduced.
One more important note: the software does not send any data through the Internet, but calculates everything locally. This is extremely important to me personally, as the PDFs usually contain very private correspondence.
If you are interested in the software, you will find it here in the App Store or via this box:
[appbox app store id1450640351]
Jens has been running the blog since 2012. He appears as Sir Apfelot for his readers and helps them with problems of a technical nature. In his free time he drives electric unicycles, takes photos (preferably with his iPhone, of course), climbs around in the Hessian mountains or hikes with the family. His articles deal with Apple products, news from the world of drones or solutions for current bugs.