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This article attempts to showcase how to compress PDF file size by sharing some of the best mobile PDF compressors. But first, we will throw a little light on why compressing PDFs is essential. 

PDF is a versatile file format with many advantages, such as portability, and when compressed, it becomes much better and optimized for webpages, SEO, etc. Also, when a PDF is compressed, it becomes significantly smaller, making it easy to send by email and occupying less space.

Because they are the most popular documentation format, some elements, such as images, graphics, visuals, etc., can quickly blow up the size, creating mobility difficulty for the file if not compressed.

So, it is essential to compress PDF files and make them as small as possible to improve mobility, speed, and space consumption.

Top Apps for Compressing PDF in Mobile


You can use FormatPDF for mobile since it is one of the best PDF tools to reduce the size of your file. It is a powerful all-in-one online tool for editing PDFs, requiring no payment to use it as a normal user. With FormatPDF, you can Sign, View, Edit, Split, Merge, Organize, Convert PDF to other formats and back, etc. 

In addition, the entire compression process is online; therefore, it can be used from any device and with any operating system. Finally, FormatPDF is a secure platform that ensures that your PDF document isn’t exposed to any virus attack or security breach during the compression process.

FormatPDF is a secure platform to edit PDFs, and the best part is that it is entirely free, poses no risk of virus attack, and is compatible with every device and operating system.

It has an economical subscription option in case you want to improve its service.


  • It is free
  • Compression is entirely online
  • Simple user interface
  • Has the complete functionalities of every PDF editor


  • It May take a while to compress PDF if the file is large


Including iOS and Android, it is a simple mobile PDF compressor but possesses full features of a PDF tool that can be used to create, add comments, compress, sign, and convert PDF to other formats and vice versa.


  • Can create PDF from scratch or template
  • Can add watermarks to PDF
  • Provides all the full functionality of a PDF tool, including compressing PDF


  • It has an excellent user interface but could improve upon a few options, like the drawing sign, which is difficult to find.
  • It is not free.

PDF Extra

With PDF Extra, you have total control of your PDF file and can carry out any task, including compressing PDF. It is a mobile PDF compressor that works great for mobile and PC, and it comes with glowing reviews and a free trial.

Some other tasks you can carry out with PDF Extra include commenting on a PDF, converting PDF to other formats, highlighting PDFs, etc.


  • Although not free, it is affordable
  • It is reader-friendly
  • Easy to use
  • Has extensive features for editing and organizing PDF


  • Some security features are not available
  • Has fewer Create and Convert options than most mobile PDF apps
  • No OCR technology 


If you are searching for an efficient mobile PDF compressor, then PDFExpert will do just fine. It has an amazing user interface and offers a convenient option of selecting the most suitable layout before editing your PDF. 

Compressing PDF on mobile using PDFExpert is relatively simple, and other features it offers include reading, editing, and commenting on PDF. It can as well be used to fill forms in PDF files, sign PDFs electronically, etc.


  • Nice user interface
  • Can be used to sign PDF 


  • It is not free
  • Only available on iPhone

Foxit PDF Editor

Foxit is another excellent mobile PDF compressor, even though most of its features are meant to be purchased individually. Regardless, it offers affordable and fast PDF solutions for desktop, web, iOS, and Android users. And, if you have to fetch the PDF documents you want to compress from cloud services such as Google Drive, it will cost you a pretty dime.


  • Conversion of files is fast and easy
  • Great for iOS and Android device 


  • It is a bit pricey, and users must pay to access its features
  • Not as user-friendly as most mobile PDF apps 

PDF Reader Pro

PDF Reader Pro is a powerful PDF mobile PDF compressor. It can also be used to annotate, fill forms, edit the pages of a PDF, convert PDF to other formats and vice versa, etc., on mobiles, including Android and iOS. It also has OCR that makes it efficient and easy to compress scanned documents, etc.


  • Easy to navigate
  • User-friendly
  • Affordable


  • Late customer help response
  • Updates sometimes come with bugs
  • Starts to lag after too many annotations
  • Not free

In conclusion, there are many different mobile PDF compressors, each with its limitations. However, choose the one that better fits your project needs.

Let us know your experience with them and the other pros and cons of each one if you try them!