PDF is a popular format that almost all eReaders support. But, it is difficult to view PDF files on screens with restricted size and resolution.  

Therefore, the most important thing that you need to consider before choosing a PDF eBook reader is that the data in PDF format has to be reflowable to make it fit the screen width and size of different eReaders available in the market today. 

Some of the best PDF readers for Windows and Android that you can look at include-

1. KITABOO

KITABOO is an interactive eBook reader for Windows and Android users that supports multiple formats, including PDF.

Among some of the key features of the KITABOO eBook reader are-

• The platform has an offline reading feature that allows you to download your eBooks and read them anytime on your devices.
• Offers a clean and intuitive interface.
• Comes with an autoplay option which allows you to open the PDF eBook and read-aloud page by page.
• The software accepts most file formats, including PDF, ePUB, PRC, TXT, PNG, MOBI, CBR, DOCX, and more.
• Allows users to make notes, bookmark pages, highlight texts, and much more.

Pros

• Fully compatible with multiple operating systems, including Windows, Android, and iOS
• Offers an interactive reading experience by supporting video, audio, and images 

Cons

• Could not come across anything significant.

2. Aldiko eBook Reader

This is another excellent PDF eBook reader that allows Windows and Android users to conveniently download and read their eBooks on their mobile devices.

The key features of Aldiko include-

• Most eBooks on this PDF eBook reader are free and can be easily downloaded from within the app
• The platform offers a customized reading experience in terms of background color, font, and margin
• The platform allows you to create your own bookmarks anywhere in the book and jump to a different section of the book through the table of contents
• With Aldiko, users can browse a wide range of eBooks from anywhere and at any time

Pros

• The platform enables users to download and read books on their mobile devices
• A large number of eBooks can be downloaded from varied sources, and many of them are free

Cons

• The platform supports only ePUB, PDF, and Adobe DRM formats

Related Read: Best ePUB Readers for iOS

3. Google Play Books

Google Play Books is a free PDF eBook reader compatible with Windows, Android, and iOS apps. All you need to do to access it is sign in with a Google account. 

Here are some of the key features of Google Play Books –

• Allow users to change fonts, text size, line height, etc. and also to switch between day and night settings
• PDF or unprotected ePUB files can be easily uploaded for reading with the Google Play Books app
• Features such as bookmarks, reading positions, and notes are synced across all devices when logged in with the same Google account
• Allows you to search within book text, look up words in the dictionary, or the web

Pros

• The PDF eBook reader offers multiple choices of flowing text and many scanned pages
• It gives you free eBooks after you first sign up
• Advanced features such as 3D page turn for reading PDF eBooks

Cons

• Mandatory to have a Google account to sign in to the app

4. PDFelement 

PDFelement is yet another great PDF eBook reader that comes with a variety of viewing modes and an array of options to zoom in and out when reading PDF eBooks.

Other key features of this eBook reader include-

• Super intuitive, user-friendly, and feature enriched software
• Enables users to read and edit various elements of eBooks and PDFs
• Allows you to create and edit PDF documents along with the option of converting eBooks from PDFs to other formats
• The platform enables you to use the OCR feature to work with both image-based and scanned PDFs in multiple languages

Pros

• Enables you to change images, adjust the font, update watermarks, reorganize pages, and more
• Optimizes your PDF files for easy reading 
• Converts PDF to ePUB, Excel, HTML, Word, Image, etc.
• It can merge multiple PDF files into a single PDF

Cons

• Sometimes when writing text in Google playbook, its format changes.

5. Kindle

Kindle PDF eBook reader is a well-known name that enables users to open and read various file formats from Windows, Android, and other operating systems. 

Key features of this eBook reader include-

• A visually appealing interface
• Presents your PDF eBooks in a way that you can easily open and store in the cloud or on your device
• Allows users to bookmark their current spot and go back to the library
• Gives an option to return to the last page viewed, along with minimal distraction caused by the icons to flip pages

Pros

• Easy to use and simple interface
• Bookmarks available

Cons

• Mandatorily requires an Amazon account login 
• Makes it difficult to access books that are not bought via Kindle