TK, to prevent the unathorised connections calling home I strongly recommend not binding the giveaway license to the online so called "VIP" account AND once activated adding to the systems hosts file (use an internet search engine to find out how to do this)

127.0.0.1 support.aoscdn.com
127.0.0.1 gw.aoscdn.com

that will block the covert multiple outbound https connections that occour every time you start up this program.

PS In a presentation with many images (500 pages, 40 MB) compression rate with "normal" settings is about 50%, but there is visible loss of image quality. Setting "quality" looks better, but the final file size is almost the same as the original.
Disturbing...

ricohflex, not it doesn't. I never download anything that is not lifetime... these are not giveaways, these are extended trial software... and that's what Gotd has mainly turned into lately...

ricohflex, you don't need to decompress these files for use or to view. If you do the compression in a reasonable way ("normal"), the files are just as useful compressed as they were when untouched.

Frank D, try set compression to "normal". See my comment above...

Frank D, try this:
https://www.ilovepdf.com/compress_pdf

Frank D, yes you are using a program developed by developers that have no expertise in PDF, Video or image compression but just produce a simple GUI to 3rd party libraries they plagerise and steal the intelectual property of. Rather than using the genuine developers, who write their own code or legitimatly buy in 3rd party licenses and attribute the original developers and their rights instead of stealing 3rd party developers libraries, programs.

Why is China accused of Intelectual Property theft? Because of companies like apowersoft. They could not function without stealing 3rd party code.

Henry, actually it was already set to "normal" when I did this "compression."

mp, I tried it with my 136MB PDF file, but the operation timed out at 10 minutes, and it said, "Sorry." So this website is useless for large files.

Frank D: here are original and compressed screenshots from a ~25MBfile. Notice the degradation after compression. This makes the program unacceptable for me.
file:///C:/Users/frank/Dropbox/Public/Compressed.jpg
file:///C:/Users/frank/Dropbox/Public/Original.jpg

Frank D: Those screenshots are here:
https://imagizer.imageshack.com/img922/7420/isqEse.jpg
https://imagizer.imageshack.com/img922/305/pugS5w.jpg

TK, thank you. I'm uninstalling this program.

"what is a typical compression outcome without losing quality..."

Zip, 7-Zip etc. reduce the file size of some types of files, e.g. text, because they have *white space* that can be eliminated when the file's compressed, added back when the files expanded. Photos and video do not, so to make their files smaller you generally have to remove data, which means some quality loss. For video you can re-encode to one of the more efficient codecs, e.g. H.265, which will let you preserve more of the original quality. You can also reduce the frame size, fps, and/or bit rate -- sometimes frame size has the greatest impact & lowest relative quality loss. Also try to make sure you use VBR [Variable Bit Rate], which sadly many converters will not do, at least easily.

That all said, you can encode anamorphic 1080p VBR video at a bit rate of 1 - 2 and get Very watchable results.

mp, ALL recompression of any video using standard MPEG/HEVC/VP? codecs as well as MANY others all produce measurable quality loss even if you make the resultant file bigger by increasing the chosen output bitrate. They always lose some level of data on each time through the recompression. It is possible to lossily recompress without apparent quality loss when displaying the output on an inferior display or viewing with inferior eyesight... all of which are highly subjective and that is the reason your question cannot ever have an undisputable definitive answer. Sorry.

mike, text is not compressed by eliminating "*white space*" in lossless compression methods but by searching out repeated patterns within the text that can be encoded more efficiently and creating dictionaries of repeating patterns and the compressed data comprises of the dictionary and a stream of indexes into that dictionary. x264/x265 add to the process eliminating certain visually normally insignifficant types of data as well as temporal repetition removal so where a section of the raster does not change from one frame to the next it is not encoded again and again. There is also a feature where a block can be described as moved from one position to another position within a raster from one frame to the next so only the index to the block and the new location is needed to be encoded and not the entire block in the new location. The way you are describing eliminating *white space* to compress and then restoring the *white space* on expansion without indicating this mythical *white space* is contained within the compressed data stream in some manner and NOT eliminated. It is encoded if your mythical *white space* is refering to repeated patterns of characters including traditional characters normally called "white space" e.g. the normal space character and TAB characters and any other non-text producing characters. LZW and derivitives to not restrict their encoding to just "white space" character encoding but every character sequence within a file. Photos and videos are not traditionally zipped for extra compression of the content primarily because the VAST majority of such media is already heavily compressed using some optimised compression method anyway and attempting to find redundant repetitions within such highly compressed streams of data is very unlikely and resource intensive and sometimes can result in larger files than you started with. But if you are brave enough to start with clean uncompressed content there are LZW and LZH codecs used with BOTH photos AND Videos! HUFFYUV and TIFF LZW lossless compression for example used when compression is desirable but not at the expense of data integrity.

RC, Clearly states 1 year. Pay attention!

RC, on the "man page of this GOTD https://www.giveawayoftheday.com/apowersoft-pdf-compressor/ you cyn see in the right column (blue background) System requirements etc., there are also license details (here: 1-year license). I normally avoid limited-time licenses, but this time I give it a try - I use this functionality and if it works better then my current sw, I can buy it (or maybe it re-appear here)...

Right you are: I see it now. Usually it is in the description in the email or on the webpage. My bad--it does say 1-year license in the side bar.

Aris , I don't see why anyone would want to decompress a file that had been compressed to "Normal," since they wouldn't be able to see any quality difference anyway, not having the original to compare it to.

Candice, it is entirely possible and probably desirable to activate the license code provided in the readme.txt without ever creating an online account. Why do you want the giveaway participants to create an online account and bind it to the giveaway license so desperatly that you don't describe the simple press one button on the unregistered GUI which launches the BUY web page then wait a bit and eventually an input box apears where you can paste in the license code from the readme.txt Periodically the program will offer to bind the license to an online account which you can refuse and there is a check box to tell the program to not ask again and the program then continues like a normal licensed program appart from the unathorised https conenctions to a couple of your servers on startup that I've dealt with in another comment thread that may or may not make it to public viewing.

David Wellman, I have the key, but I see no where to enter it?

AFPhantom2, You Need To Create, Or Login At Their Homepage In Order To Create An Account. At The Top Of This webpage, On The Upper Right Side, Click On The "Home" Tab. Or Go To:
https://www.apowersoft.com/compress-file
There, On The Upper Right, Click "Login" To Login, Or Create An Account.
Once You Create An Account:
Within The Program You Have Installed, At The Upper Right Of The Window That Comes Up, There Is A Small Silhouette Of A Man. Click It To Login With Your Account. Then Just Left Of The Silhouette Is A "Get VIP" Tab. Click It, Then Input The Key. Good Luck AFPhantom2.

OK, able to download now. Oh, it is actually video, image and PDF compressor, even better.

It is "ApowerCompress" instead of "Apowersoft PDF Compressor", Thanks very much.