Every day, we all produce multiple PDF files from various applications, for multiple purposes. But when it comes down to sharing those PDFs with others, we either start filling our cloud storage, use up our precious mobile data volume, jam internet connections or even receive obscure replies from some Mr. Mail-Daemon, telling us the file we tried to send it too large.

PDFLight for Mac OS X puts an end to all of this!

Whether it is a multi page business report, sophisticated corporate presentation or your resume, the size savings achieved through PDFLight and the ultra fast, high quality display of graphics and text even on tablets and smart phones are equally impressive.

Leveraging on DALIM SOFTWARE’s award winning cross media workflow TWIST, PDFLight brings intuitive high-end PDF optimisation on every desktop!

At DALIM SOFTWARE we believe that data management and storage is a major environmental pressure being placed on the world today. Through this pioneering approach for a software company already relying entirely on sustainable energy sources along with our cutting edge collaborative tools, which allow people to collaborate without unnecessary replication of data at enterprise level we have decided to go the extra mile and apply the concept to a Desktop Consumer App.
Through the reduction of PDF file sizes to an absolute minimum and the increased display performance, the very intuitive PDFLight app is one of our many contributions to a greener future!

Ratings and Reviews

4.6 out of 5
5 Ratings
5 Ratings

Good Quality Compression

I agree with another reviewer on the quality of the compressed file being as good as the original vs other tools which (probably) use lossy type compression.

I do have some comments that were sent to the Seller for improvements to v1.0 that I have.

Specifically, I found this tool to remove the Author and Title meta data. This is unfortunate as I use Calibre to keep track of technical papers and really want that information to stay.

Additionally, there have been a couple of PDFs that crash this app. My guess is that the original creation tool was flawed and this tool sees that as an error.

Last comment, there is some inconsistancy when dropping multiple files onto the interface where you get prompted for destination on the first file individually, but the second and third seem to be prompted together.

Overall, when this tool finds that compression is possible, it works very nice and produces a file identical to the orginal quality, just smaller.

mitxen ,

Nothing comes close!

Some might complain that you can't customize the compression or tweak any parameters.
But on the other hand, nothing comes close in the size vs quality equation. All those other PDF compressors, squeezers, shrinkers, optimizers, etc. work "blind", removing non-printing data and recompressing pictures but never actually rendering the file. If your original file was created very efficiently with non-cropped pictures and without much picture overlaps or image transparencies, fine. But otherwise, if your PDF file (i.e. Illustrator export) has a lot of those things, a 200Mb brochure reduced by PDFLight to just 1Mb looks almost as good as the original, vs. a 3Mb version produced by other tools in which the extreme downsampling and high jpeg compression make it look like crap. A 10-15 Mb version produced by other tools is about the same quality as the 1Mb version from PDFLight.
PDFLight achieves this because inside there's actually a PDF render engine (a RIP by old terminology) which leaves only the actual visible portions of images, and flattens them all for maximum efficiency before compressing. While keeping text and non-transparent vectors as such.


Dalim Software GmbH
28.6 MB
OS X 10.10.0 or later, 64-bit processor
Age Rating
Rated 4+


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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