Librera App is the most used Book and EPUB Viewer for Android

What is Librera Reader?

Librera Reader is a free, open-source eBook reader and viewer for Android devices.

It comes with a long feature-list that makes it unbeatable among other Android eBook readers.

The developer offers a free version hover, it comes with advertisements, which you can ignore if you use  the Pro version.

Librera has more than 10 millions download from Google Play Store and other platforms.

Supported formats

  1. PDF
  2. EPUB
  3. MOBI
  4. DjVu
  5. FB2
  6. TXT
  7. RTF
  8. AZW
  9. AZW3
  10. HTML
  11. CBZ
  12. CBR


Book Reader Interface

  1. Modern reading design
  2. Change theme and accent colors
  3. Night or daytime theme (Substratum friendly)
  4. Book display as a list or grid
  5. Change the size and look of book covers
  6. Library search
  7. Favorites list
  8. Recent list
  9. Notes and bookmarks in all formats

Bookshelf (Library)

  1. Search for EPUB, FB2, PDF, etc. documents and create a library
  2. Add and remove folders
  3. Filtered book search: by title, author, series, genre, etc.
  4. Book display sorting: by author(s), genre, series, size, etc.
  5. Open folders w/ image assortments as books (bookbinding)

Reading settings

  1. Change background and font colors
  2. Solid and textured backgrounds (work for all formats, even PDF and DjVu)
  3. Select fonts for text, titles, italics, etc.
  4. Change reading direction (LTR, RTL)
  5. Intelligent white space cropping
  6. Night mode
  7. Lock page in place to disable accidental dragging
  8. Accurate PDF text reflow
  9. Page splitting
  10. Multi-word text search
  11. Honored document's CSS styles for EPUB, AZW, AZW3 and MOBI books
  12. Contents presentation in the form of nested hierarchy
  13. Commenting and drawing in PDF files
  14. Thumbnailed page display in Go To
  15. Open password-protected PDF documents
  16. Accurate multi-line text selection w/ draggable handles
  17. Manual brightness adjustment (+auto-brightness setting)
  18. Configurable tap-zones
  19. Text alignment, indents, line spacing, additional fonts
  20. RSVP speed reading for all supported formats

Unique mode for musicians

  1. Automatically scroll sheets at an adjustable speed
  2. Fast transition between previous and next sheet
  3. Return to the first sheet
  4. Notes and drawings

Learning foreign languages

  1. Listen to audio files within Librera (internal media player)
  2. Read aloud (using stock and custom Text-To-Speech engines)
  3. Dictionary lookup (installed dictionaries: GoldenDict, ABBYY Lingvo, ColorDict, etc.)
  4. Online search for word meanings and passage translations (GTranslate,, Oxford, Longman, Cambridge, Collins, Merriam-Webster, Vdict, etc.)

PDF reader and PDF viewer

  1. Find all PDF documents on the device
  2. File manager, cover view
  3. Changing the document's background
  4. Day and night theme
  5. Notes, comments, and bookmarks
  6. Automatic scrolling at an adjustable speed
  7. Voice reading (TTS Reader)
  8. Opening of password-protected documents
  9. Page splitting
  10. Option to prevent accidental page dragging

Comic book reader and comic book viewer

  1. CBZ, CBR formats (CBZ Reader)
  2. Thumbnail view
  3. Remember reading position on book close or/and exit

Advanced Features

  1. Opening any book (epub, fb2, mobi, pdf) packed in zip-format
  2. Opening documents in emails, file managers, and other sources
  3. Exporting notes to a file or an email
  4. Export and import book and app settings (automatic)
  5. Widget on the desktop
  6. Page sharing as image
  7. Support for offline Calibre libraries (search, meta-data, covers)
  8. EPUB3 multimedia support (video and audio)
  9. Office doc formats LibreOffice, OpenOffice (ODT, RTF)
  10. Support for online book Catalogs (Gutenberg, Manybooks) search and download

Other features

  • Comes with a user-friendly interface
  • Full support for EPUB, PDF, and Mobi formats
  • Grid view
  • Manage books library
  • Access your local folders or SD card directories
  • Access the recent books
  • Custom readable fonts
  • Easy document discovery by configurable criteria:
  • Auto-Scan (of user-preset folders)
  • Browse (with an in-app file explorer)
  • Recent (featuring a reading-progress indicator)
  • Support for bookmarks, annotations, and EPUB3 tables of contents
  • Support for clouds and online catalogs
  • Syncing across Android devices via Google Drive (reading progress, bookmarks, etc.)
  • Configurable Day and Night modes
  • Configurable link color (hence, footnotes, and end notes color)
  • Support for many popular online (including translators) and offline dictionaries
  • Vertical-scroll lock
  • Auto- and manual centering of documents
  • Custom CSS code input
  • Single-page view of two-page documents
  • Musician’s mode with configurable scroll speed
  • Customizable TTS reading and built-in media player
  • Multi-word text search
  • Online document conversion
  • Reading of archived (.zip) documents
  • Support for RTL languages (Thai, Hebrew, Arabic, etc.)
  • Import and export of settings, auto-backup of current session
  • Leading initials in FB2 documents
  • And a bunch of other features for you to check out.


  1. Google Play Store
  2. F-Droid


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