The simplest PDF viewer. Safe (doesn't require permissions), lightweight (just 6,9MB) and modern.
Cost / License
- Free
- Open Source
Application type
Platforms
- Android
- HUAWEI AppGallery
- F-Droid
- Kindle Fire

pdf.io is described as 'Free set of online tools for handling PDF files. Convert and edit your PDF files with incredible ease and speed!' and is a PDF Editor in the office & productivity category. There are more than 50 alternatives to pdf.io for a variety of platforms, including Windows, Mac, Android, iPhone and Linux apps. The best pdf.io alternative is SumatraPDF, which is both free and Open Source. Other great apps like pdf.io are Okular, Foxit PDF Reader, Evince and MuPDF.
The simplest PDF viewer. Safe (doesn't require permissions), lightweight (just 6,9MB) and modern.

Ashampoo PDF Free is a software for opening, reading, and creating PDF files. It includes a built-in printer driver for generating PDFs from any Windows application, a compact and fast PDF reader, and the ability to fill out interactive and static forms.


Besides exceptionally fast launching and displaying speed, Gaaiho Reader is reliable in printing, filling forms annotating documents and adding bookmarks.




EBookDroid is an open source (GPL'ed) document viewer for Android based on the VuDroid code base.


A simple PDF document viewer, in the lines of Evince but without using the Gnome libraries. ePDFView is a free lightweight PDF document viewer using Poppler and GTK+ libraries.

Read, edit, annotate, and sign PDF documents with built-in AI features like summarize and translate, OCR in 50+ languages, fill forms, export to major formats offline, apply watermarks, compress files, secure with passwords, and use text-to-speech on all major platforms.




Panels is a CBR/CBZ/PDF comic reader for your iPhone and iPad devices. Enjoy reading your comics in a clean and delightful interface.



PDFChef enhances document management with cross-platform support on PC, Mac, iOS, and browsers. It offers text-editing, page rearranging, conversion tools, and cloud-based sharing. Supporting various file formats, it also enables users to add signatures directly to PDFs for swift document finalization.




AI powered productivity tool for reading, understanding and taking notes on PDFs and long websites. Users can search, summarise, extract and define keywords, ask google-search type questions and be taken straight to the answers.




Genei is the most popular SaaS alternative to pdf.io.
Xpdf is a free PDF viewer and toolkit, including a text extractor, image converter, HTML converter, and more. Most of the tools are available as open source.



Cloud-based PDF viewer and annotation tool for your browser. Perfect for Chromebook 1:1 schools. View, export, print and share your PDF files straight from your browser. Kami works on all browsers and works best with Google Chrome.