While Adobe's free desktop PDF reader feels a bit bloated, the mobile version is light and functional. Adobe Reader on Android and iOS can display a range of PDF documents, including those with fillable forms, password protected files and those protected with Adobe LiveCycle DRM. Adobe Reader includes text reflow, a contextual search feature, bookmark and hyperlink support, as well as the ability to fill out forms. Users can also insert and view annotations, as well as electronically sign documents. Users who sign up to a free Adobe Document Cloud account can share and sync their documents online, and additional features such as PDF editing and creation are available as in-app purchases.
The mobile version of the popular desktop tool, Foxit Mobile PDF (Android, iOS) is a solid dedicated PDF reader app for your mobile needs. On the display end, Foxit handles normal and password protected PDFs, with support for document and user bookmarks. Annotation options let you highlight, underline or strike through text. You also can add sticky notes text boxes, or even draw freehand on the document. Text reflow allows you to read comfortably even on a small smartphone screen. Cloud support lets you upload and download PDFs from popular storage providers. Foxit has also introduced a new ConnectedPDF feature for collaborative work, annotations, comments and edits on a team's files.
Another PDF reader to check out is Bookari (Android, iOS). Formerly known as Mantano Reader, it supports EPUB and PDF formats (including Adobe DRM support). Bookari features a customizable and feature-packed reader, with a variety of features such as reader themes, a night mode, text search, annotation and a pinnable navigation panel to let you easily jump between chapters, bookmarks and pages. The $4.99 paid version of the app delivers additional features, and a premium subscription to Mantano Cloud adds support for library and reading progress syncing across devices. It might not be as snappy as more focused PDF readers, but Bookari makes for a nice all-in-one for your EPUB and PDF needs.
Google Play Books (Android, iOS) is another app worth considering for its cloud storage functions. You can upload your own PDF & EPUB files into your Play Books library for cross-device ease of reading, though if you do most of your PDF reading away from a wireless signal, that may be an issue. In addition to cloud storage features, you can also access Play Books' marketplace, as well as customize the reader view for ease of use. Text highlighting, a built-in dictionary, and map search give you features to play with, and cross-device syncing lets you save your reading position across devices.
Kdan Mobile's PDF Reader is an excellent free Android and iOS PDF reader that provides solid rendering and reading as well as a neat document scanning feature. PDF Reader supports bookmarks, outlines and thumbnails; it can also open password-protected files. Text search and a page slider allow you to navigate to where you need, while a text reflow option provides a comfortable reading experience on a small screen. Annotation tools let you easily mark up documents, and cloud support allows you to upload, download and backup documents. A scanning mode lets you use your camera as a scanner and create PDF files from your camera roll.
PDF Markup Cloud is Kdan's beefier, professional-oriented, and iOS-only version of its PDF viewer and annotation software. As the name suggests, the app includes markup and annotation tools for PDF documents and a Web highlighter through an in-app browser, as well as support for audio notes and digital signatures. The Cloud portion of the app supports a variety of storage and backup options, such as Dropbox, Google Drive, or Kdan Cloud. Limitations on the free version such as number of files stored are removed on the $9.99 Ultimate version, and a premium subscription includes extra cloud management tools.
iAnnotate is a slick PDF reader and annotator that comes with a lot of nice features and customizations for your PDF reading and editing convenience. Users can open up PDF files, search for terms and keywords and navigate through bookmarks or a continuous scroll view mode. The real hallmark of the program is the powerful set of annotation features that allows you to add notes, draw, highlight, underline and strike through; you can also add digital signatures. A Web capture mode lets you convert web pages into PDFs for annotation and easy sharing. Tabbed browsing means you can have multiple documents opened for quickly flipping through your books and docs. PDFs can be flattened, imported to various cloud services, or emailed to recipients.