Cool Reader

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265K reviews
Content rating
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About this app

eBook reader. Supports epub (non-DRM), fb2, doc, txt, rtf, html, chm, tcr, pdb, prc, mobi (non-DRM), pml formats.

Pages or scroll view. Page flipping animation.
Table of contents, bookmarks, text search.
Bookmarks on text fragments (comments or corrections) - useful for proof reading.
Export of bookmarks to text file.
Built-in file browser, quick recent books access.
Online catalogs (OPDS) support.
LitRes online book store support.
Text to Speech (TTS) support.
Hyphenation dictionaries;
Most complete FB2 format support: styles, tables, footnotes.
Additional fonts support (place .ttf to /sdcard/fonts/)
Support for Chinese, Japanese, Korean languages; autodetection of TXT file encoding (GBK, Shift_JIS, BIG5, EUC_KR).
Day and night profiles (two sets of colors, background, backlight levels).
Brightness adjustments by flick on left edge of screen.
Background texture (stretched or tiled) or solid color.
Paperbook-like page turning animation or "sliding page" animation.
Dictionary support (ColorDict, GoldenDict, Fora Dictionary, Aard Dictionary).
Customizable tap zone and key actions.
Autoscroll (automatic page flipping) - start using menu/goto/autoscroll or assign action Autoscroll on key or tap zone; Change speed using volume keys or bottom-right and bottom-left tap zones; stop - tap any other tap zone or key.
Can read books from zip archives.
Automatic reformatting of .txt files (autodetect headings etc.)
Styles can be customised in wide range using external CSS.
Select text using double tap (optional).

Place additional textures to /sdcard/.cr3/textures/ -- to be used as tiled page backgrounds.
Place additional textures to /sdcard/.cr3/backgrounds/ -- to be used as stretched page backgrounds.
(/cr3/ directory can also be used instead of /.cr3/, and internal SD or internal storage instead of /sdcard/)

CoolReader requires following permissions:
WAKE_LOCK - to control screen backlight
INTERNET - to use online catalogs

CoolReader is free, open source (GPL), multiplatform project.
Project homepage on SourceForge is
To donate this project, you can buy Cool Reader Gold ($10), Silver ($3) or Bronze ($1) Donation package from Market

In case of issues after update (e.g. crashes while reading) try to remove directory SD/.cr3/cache and book database files SD/.cr3/*.sqlite

Windows version can be downloaded here:

As well, consider using "Cool Reader GL" - cross-platform Cool Reader version with UI rewritten in C++, with hardware acceleration based on OpenGL. Optimized for new devices with big high resolution screens. Both versions can be installed together.

Project homepage:
Updated on
Mar 9, 2021

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265K reviews
March 6, 2023
Feature request: bionic reading! It's a fantastic ePub reader and I can't say enough good about it. Absolutely no ads works with tons of different formats including PDF epub and mobi and a couple others that I can't remember right now. Some of the settings are a little bit difficult but the actual user experience is very good once you get the hang of the menu system.
9 people found this review helpful
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January 13, 2023
When reading .mobi format app adds 2 spaces after apostrophe. Very annoying to try to read a book. After spending 3+ hours messing with settings I FINALLY got it so it was semi usable. Far too many settings combinations and impossible to pick ones to allow the app to work. This needs an instruction manual the size of a dictionary, which, of course, it DOESN'T HAVE. LOOK ELSEWHERE!!!
1 person found this review helpful
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A Google user
May 6, 2019
Cool Reader allows more customizations than have ever seen in a ePub reader. Plus, it has a soothing background, parchment paper, that is much easier on the eyes than just a color would be. Finally, it has a scrolling mode that lets you go down through the book or document with out having to flip pages, which is ideal for one of my uses. The only reason it doesn't get 5 stars, is that it changes bold to Comic Sans. I wish this were an option that could be disabled. It is harder to read.
43 people found this review helpful
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What's new

Text-to-speech improvements.
Cloud synchronization fixes.
Stability fixes.
Onyx e-ink readers support.