4 Best Free Portable PDF Compressor Software for Windows

Here is a list of Best Free Portable PDF Compressor Software for Windows. These free software enable you to reduce size of a PDF document without putting in any effort. All these come in a portable package that allow you to use these PDF compression software without installing them on your PC. You can carry these software in a pen drive or any other portable storage device and compress PDF documents on the go.

These software automatically compress a PDF and reduce its size with minimal quality loss. In many of these PDF compressors, you can reduce size of multiple PDF documents at once. One of these even lets you optimize PDF documents for the web. You can also compress a PDF as much as you want in one of these software. While most of these provide you a GUI, one software is command based that lets you compress a PDF file using command.

Additionally, useful features like PDF splitter, page extractor, PDF merger, PDF rotator, and more are also available in one portable PDF compressor. In general, these are good software to quickly reduce size of PDF documents without any hassle.

My FavoriteFree Portable PDF Compressor Software for Windows:

PDF Compressor is one of my favorites as it can batch compress PDF files and is very easy to use. You can also optimize a PDF file as per web standard.

You can also try PDFsam Basic if you need some more utilities along with PDF compression tool.

You can also check out lists of best free PDF ShufflerLossless Image Compression, and GIF Compressor software for Windows.

PDF Compressor

PDF Compressor, as the name suggests, is a free portable PDF compressor software for Windows. It is a useful software to compress PDF files in batch. You can also optimize your PDF documents for web view. Before compressing a PDF, you can set up a few compression options to customize resulting PDF document. Let’s checkout the steps of PDF compression in this software.

How to compress a PDF in PDF Compressor:

  • Open this software and then import one or more PDF files or a folder containing multiple PDFs using Add Files / Add Folder button.
  • Now, click on the Compression Settings button to configure options like Better compression with minor quality loss, Optimize for web, etc. You can also add PDF metadata including title, author, subject, and keywords.
  • After that, set up output folder and then click on the Start Compression option to process and compress all imported PDF files.

Additional Features:

  • Advanced: You can view file properties, move file up/ down, select file rename option, export file list, and more.


It is one of the best free portable PDF compressor that does its work quite effectively and efficiently.

PDFsam Basic

PDFsam Basic is another free portable PDF compressor for Windows, Mac, and Linux. It is basically PDF processing software that lets you split, merge, rotate, and extract PDF pages. After performing any action, you can compress the output PDF. If you just want to compress a PDF without performing any action on it, you can try a trick. Follow below steps to perform PDF compression in it.

How to compress a PDF in PDFsam Basic:

  • Start this software and go to the Extract tab.
  • Now, add one or multiple PDF files that you need to compress.
  • Next, in the Extract Pages field, you need to enter the PDF pages that you want to extract. In case you don’t want to extract pages from PDF, enter first page to last page. For example, if there are 5 pages in your PDF, type 1-5 in the Extract Pages field.
  • After that, toggle Show advanced settings and enable the Compress output files option. Also, select PDF version from 1.5, 1.6, and 1.7.
  • Lastly, set up file name settings and then hit the Run button to start PDF compression process.


It is a great PDF utility software that also lets you compress PDF documents in bulk.


pdfsizeopt is a free, open source, portable PDF compressor software for Windows, Linux, and macOS. It is specially designed to reduce the size of a PDF document. This software is different than other listed software as it doesn’t provide a GUI. You have to enter a command to compress a PDF document through it. Let’s have a look at the PDF compression command and steps.

How to compress a PDF using command in pdfsizeopt:

  • Firstly, place the input PDF file in the download folder of this software.
  • Now, download pdfsizeopt.single file and move it to the pdfsizeopt folder.
  • Next, open Command Prompt and type a command similar to this: pdfsizeopt.exe input_pdf.pdf output_pdf.pdf. In this command, input_pdf is the filename of source PDF file and output_pdf is the name of output compressed PDF.
  • After that, hit the Enter button and your PDF will be compressed and saved in the same download folder.


It is good command based portable PDF compressor that allows you to reduce size of large PDF documents.


shrink-pdf is yet another free open source portable PDF converter software for Windows, macOS, and Linux. It contains an internal compressor that allows you to choose PDF compression level. You can enter a value from 0 (maximum compression/lowest quality) to 100 (minimum compression/largest size) and based on that, it reduces the PDF size accordingly.

How to compress PDF using shrink-pdf:

  • Firstly, double click on the shrink-pdf.bat file that you get in its download folder.
  • Now, it will ask you to select a PDF document that you need to compress.
  • Next, enter the compression level value from 0 to 100 in the Input prompt and click the OK button.
  • After that, browse output file location and then press the Save button to start PDF compression process.

Final Thoughts:

It is a handy portable software to compress or reduce size of a PDF document as per your requirement.

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Komal Srivastava

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