Hello, I am creating an console application in C# that will optimize / compress pdf which contain high defination images. I have the pdf which have size above 500 MB i need to compress that kind of pdf files. 'Optimize Scanned PDF' option under DOCUMENT seems to do a great job, only problem is that it seems to take parts of the document and overlap itself.

There are many reasons why people may want to compress PDF files. For one, it’s tough to send a large PDF file through email, particularly when there’s an attachment size limit in an email account.

Moreover, users experience a hard time uploading and sharing large PDF files on the net. Fortunately, there are effective solutions available to reduce PDF file size.

If you have a demand of compressing your PDF file, please read these ten top ways and choose a proper one for you. Top 10 Ways to Resize PDF File Size Five Free Web-based Tools to Reduce PDF File Size Solution 1: LightPDF is an online website which offers several different and feasible PDF solutions, including reducing PDF files. It is easy to use and works fast, just one click to upload your PDF file, it will help you compress the document automatically. The site is free to use, thus, users can shrink PDF file size without worrying about the times for uploading or the file size limitation. Moreover, the compressed PDF remains high quality.

Apart from reducing the file size, you can also use this tool to convert, edit and protect your PDF files. Solution 2: Smallpdf This free browser-based has a simple drag-and-drop feature for uploading files. There are no extra options or specific compression settings but the quality is good, and the resulting size is optimized enough.

After the compression process which takes a couple of minutes, you can instantly download the file. Smallpdf claims that files are deleted permanently after an hour to ensure privacy.

It also supports all platforms including Windows, Mac and Linux. Solution 3: PDFaid offers more features and settings for file compression.

It can reduce a PDF file size online up to 20 MB through multiple ways such as resizing and resampling images in a PDF document. The detailed settings also come in handy if you want specific file compression options. You can adjust the color image quality, grey image quality, monochrome image quality, and select or deselect options such as flatten, compress streams, and unembed fonts.

This web application is available for free and compatible with all operating systems. Solution 4: Neevia Online PDFcompress Neevia Online PDFcompress has a straightforward interface with a handful of good compression settings including compression presets, type of image compression and corresponding quality, and other additional options like removing bookmarks, annotations, page labels, etc. You can reduce PDF file size for free up to 5 MB. This is a web-based program but there’s also a software available if you’d like to optimize PDF files locally. Solution 5: VeryPDF Free PDF Compress Online compresses images and processes fonts to shrink PDF file size up to 10 MB. The online application is available for free but there’s also a paid software offered if you want to compress large PDF files in batches. VeryPDF provides a useful extra option for compressing files: Aside from uploading a local PDF, you can also enter a URL address of an online PDF.