The Aurora Journal
Read better on Android
Guides, comparisons and quiet tips for people who love books, and want their phone to get out of the way.
Making the Reader Switch to Night Mode on Its Own
A schedule that flips the theme at dusk removes a decision you were making badly. It follows the clock, not the light, and that difference matters.
Start with a topic
Getting started
You have a book file and an Android phone. These cover the gap between the two.
Ebook formats
EPUB, PDF, FB2, MOBI, AZW3 and TXT: how to open each one, and which to keep.
- Ebook File Formats Explained: EPUB, MOBI, AZW3, FB2, PDF, TXT
- How to Read PDF Ebooks on Android
- How to Read MOBI Files on Android
- How to Open an AZW3 File on Android
- How to Open an FB2 File on Android
- How to Read TXT Files Like Ebooks on Android
- What Is an EPUB File?
- EPUB vs PDF: Which Ebook Format Should You Use?
- AZW3 vs MOBI: What Is the Difference?
Free ebooks & OPDS
Where the legal free books actually are, and how to reach them without a browser.
Choosing a reader
Which Android reading app fits how you actually read, including when ours does not.
While you are reading
The tools that act on the book in front of you: reflowing a PDF, looking a word up, finding a line, marking it, and reading without your hands.
Reading comfort
Fonts, spacing, brightness and themes: the settings that make a long book pleasant.
- Comfortable Reading on Your Phone: Dark Mode, Fonts & Eye Strain
- The Best Dark Mode for Reading Ebooks at Night on Android
- Making the Reader Switch to Night Mode on Its Own
- When the Built-In Fonts Are Not Enough: Loading Your Own
- Dyslexia-Friendly Ebook Reading on Android
- Why "14 Minutes Left in This Chapter" Is Usually Wrong
Fix ebook problems
Find the file, move it safely, diagnose what failed and protect the library before changing devices.
- Where Are Ebook Files Stored on Android?
- How to Import Ebooks from Google Drive on Android
- How to Transfer Ebooks from a Computer to Android
- How to Back Up Your Ebook Library on Android
- How to Remove Duplicate Ebooks on Android
- How to Tell If an Ebook File Is Corrupted
- Why a Text File Opens as Rows of Nonsense Characters
- Why an ACSM File Is Not an EPUB on Android
- Why PDF Text-to-Speech Is Not Working on Android
Everything else, newest first
When the Built-In Fonts Are Not Enough: Loading Your Own
Bundled fonts cover Latin text well and other scripts unevenly. Adding a TTF or OTF file fixes rendering that looks broken in Devanagari, Thai and Arabic.
Which Parts of a Reading App Need the Internet
On a plane or with data off, most of a reader keeps working and a few things quietly stop. Knowing which is which before you board is the whole point.
Highlights You Can Actually Get Back Out Again
Marking passages is easy. Retrieving them a year later, from an app you may not still use, is the part that decides whether the marking was worth doing.
Why "14 Minutes Left in This Chapter" Is Usually Wrong
Most reading-time estimates assume everyone reads alike. One that measures your own pace is right eventually, and clearly wrong for the first sessions.
Listening to a Book With the Screen Off
Read-aloud is only useful if it survives the screen locking. What keeps it playing, what the lock-screen controls do, and where synthetic voices fail.
Looking Up Words Without Leaving the Book
Switching to a dictionary app costs more than the ten seconds it takes. Here is what an in-reader lookup does, what it needs, and where it stops being useful.
How to Read a PDF on a Phone Without Zooming and Panning
A PDF page is a fixed size, and your phone is not. Reflow mode extracts the text and lays it out for your screen — with two limits worth knowing first.
Finding the Line You Remember but Cannot Place
You remember a sentence and not where it was. Searching inside a book solves that in seconds, except in the one format where it fails, for a good reason.
Turning Pages When Your Hands Are Not Free
Gloves, a crowded train, cooking, one hand on a rail. The volume buttons and the tap zones exist for the same reason and suit different situations.
Why a Text File Opens as Rows of Nonsense Characters
Accents become question marks, or an entire book turns into symbols. The file is intact and the font is fine; the encoding is being guessed wrong. Here is the fix.
Why an ACSM File Is Not an EPUB on Android
Understand what an ACSM file contains, why renaming it to EPUB fails, and how to use the authorized Adobe or library workflow on Android.
How to Back Up Your Ebook Library on Android
Back up ebook files, reading progress, bookmarks and notes before resetting or replacing an Android phone, without assuming one sync covers everything.
How to Import Ebooks from Google Drive on Android
Open EPUB, PDF, MOBI and other ebook files from Google Drive on Android, keep an offline copy, and avoid confusing import with library sync.
How to Open an AZW3 File on Android
Learn how to open a DRM-free AZW3 ebook on Android, why some Kindle files stay locked, and when converting a compatible file to EPUB is useful.
How to Read MOBI Files on Android
Open a DRM-free MOBI ebook on Android, import it into a reading library, fix common file problems, and decide when converting it to EPUB makes sense.
How to Read PDF Ebooks on Android
Open a PDF ebook on Android, organize it with your other books, improve phone readability, and know when an EPUB edition will give a better experience.
How to Read TXT Files Like Ebooks on Android
Open a TXT file on Android, import it into an ebook library, improve fonts and spacing, fix encoding problems, and decide when EPUB is the better format.
How to Remove Duplicate Ebooks on Android
Find true duplicate ebook files on Android, distinguish duplicates from revised editions, and clean the library without deleting notes or the only good copy.
How to Tell If an Ebook File Is Corrupted
Diagnose an ebook that will not open, distinguish a damaged download from DRM or an unsupported format, and replace the file without losing the original.
How to Transfer Ebooks from a Computer to Android
Move EPUB, PDF, MOBI, AZW3, FB2 and TXT files from Windows, macOS or Linux to Android using USB or cloud storage, then import safely.
Why PDF Text-to-Speech Is Not Working on Android
Fix PDF read-aloud problems on Android by checking for selectable text, OCR, document permissions, language and the system text-to-speech voice.
Where Are Ebook Files Stored on Android?
Find EPUB, PDF, MOBI and other ebook downloads on Android, understand app-private storage, and move files without losing your reading library.
Best Ebook Reader Apps for Android: Which One Fits You?
Five Android ebook readers compared by the job each one does best: ad-free mixed libraries, deep customization, document-heavy shelves, free TTS and open-source.
Moon+ Reader Alternative: A Practical Comparison
Moon+ Reader versus Aurora Reader on Android: formats, ads, Pro pricing, themes, TTS, sync and OPDS, and an honest account of who each app actually suits.
ReadEra Alternative: Which Android Reader Fits You?
A fair comparison of Aurora Reader and ReadEra on Android: formats, ads, pricing model, sync and customization, and the cases where ReadEra is the better choice.
AZW3 vs MOBI: What Is the Difference?
AZW3 is Amazon's successor to MOBI, with better typography and structure. What changed, which files open in third-party readers, and why EPUB beats both.
Dyslexia-Friendly Ebook Reading on Android
What a reader app can actually adjust for dyslexic readers: OpenDyslexic and other fonts, size, letter and line spacing, line length, contrast, and reading by ear.
How to Open an FB2 File on Android
An FB2 is a reflowable ebook format built on XML. Install a reader that supports it, open or import the file, and it behaves like any other ebook on Android.
Reading Project Gutenberg Books on Android
Project Gutenberg offers 70,000+ free ebooks. How to download the right file on Android, open it in a reader, and use OPDS to skip the browser entirely.
What Is an EPUB File?
An EPUB is a reflowable ebook format: structured text that rearranges to fit your screen. What is inside one, why it reflows, and how it differs from a PDF.
Comfortable Reading on Your Phone: Dark Mode, Fonts & Eye Strain
Why phone reading tires your eyes, and the settings that help: text size, line spacing, margins, contrast, themes, brightness, blue light and reading by ear.
How to Read Ebooks on Android: The Complete Guide
Everything you need to read ebooks on Android: choosing an app, getting books onto your phone, opening any format, reading offline, and reading comfortably.
Where to Find Free Ebooks (Legally) for Android
The libraries, catalogs and archives that give books away legally: Project Gutenberg, Standard Ebooks, Open Library, your local library, Feedbooks and OPDS feeds.
What Is OPDS? Get Thousands of Free Ebooks Legally
OPDS is an open standard for browsing ebook catalogs in a reader app. Learn how it works and where to find legitimate public-domain books.
How to Listen to Your Ebooks with Text-to-Speech on Android
Use Android text-to-speech with compatible ebooks, adjust voice and speed, and understand how generated speech differs from a narrated audiobook.
The Best Dark Mode for Reading Ebooks at Night on Android
Set up the best dark mode for night reading on Android: true-black AMOLED, blue-light filters, warm sepia themes, and brightness tips to protect your sleep.
Ebook File Formats Explained: EPUB, MOBI, AZW3, FB2, PDF, TXT
A clear guide to ebook file formats: EPUB, MOBI, AZW3, FB2, PDF, and TXT. Learn each format's origin, pros and cons, and which apps and devices open them.
EPUB vs PDF: Which Ebook Format Should You Use?
EPUB vs PDF explained: reflowable vs fixed-layout, phone readability, file size, accessibility, and when each format wins. Includes a clear comparison table.
How to Read EPUB Files on Android (2026 Guide)
Open EPUB files on Android, import books, adjust fonts and themes, and identify DRM-protected files that require the original store app.