A recent XDA piece made the case that legally free books are more available than the pirate market suggests, if you know where to look. Project Gutenberg, Standard Ebooks, Internet Archive, and public library systems host millions of titles that anyone can download without breaking a copyright rule. The catch is finding an Android reader that respects them: sideloads clean EPUBs, syncs across devices, and lets you take notes without dragging the whole thing into an ecosystem.
We tested seven Android apps that keep an e-reader stocked with free, legal books. Here are the best apps for public domain e-books on Android in 2026, ranked for how they handle real EPUBs and MOBI files from the actual archives.
What to look for in a public domain reader
- File format support. EPUB is the standard; MOBI, AZW3, PDF, and (for text-only) TXT are common. Support for CBZ and CBR helps for public-domain comics.
- Sideload support. Every reader on Android should accept files from downloads or a Nextcloud folder without an in-app purchase. Some do this poorly.
- Cloud sync. If you read on a phone and a tablet, position sync makes the reader work as a system. Kindle, Play Books, and KOReader (via Nextcloud) all handle this.
- Typography and layout. Public domain scans vary hugely. Custom fonts, line spacing, margins, and hyphenation controls turn a bad scan into a readable page.
- Free-book catalogues. Some readers ship a built-in browser to Project Gutenberg or Standard Ebooks. Convenience matters when you are starting from scratch.
- Ads and trackers. Free readers vary widely. Prefer ad-free, open-source options where possible.
Quick comparison
| App | Best for | Sideload EPUB | Public-domain catalogue | Cloud sync | Price |
|---|---|---|---|---|---|
| Amazon Kindle | Kindle-store + free classics | AZW3, MOBI, EPUB (Send to Kindle) | 60,000+ free | Amazon account | Free |
| Google Play Books | Sideloading and Google account | EPUB, PDF | Free store filter | Google Drive | Free |
| Libby | Public library loans | N/A (loans) | Yes (public libraries) | Yes | Free |
| KOReader | Power-user reading | EPUB, MOBI, PDF, CBZ, DjVu | Via OPDS | Nextcloud, Dropbox | Free (open source) |
| Moon+ Reader | Feature-rich reading | EPUB, MOBI, PDF, TXT | Yes (in-app catalog) | Yes | Free, Pro $6.99 |
| LibriVox | Free public-domain audiobooks | Audio | 20,000+ works | Cloud | Free |
| Standard Ebooks Downloader | Curated public-domain EPUBs | EPUB | Standard Ebooks catalog | No | Free (open source) |
The apps
1. Amazon Kindle, best for combining Kindle store and free classics
Amazon Kindle on Android has quietly become one of the better places to read free public domain books because Amazon hosts a large free classics catalog and Send to Kindle accepts EPUB and MOBI files by email or the Send to Kindle web page. Position sync across every Kindle device is best-in-class.
For anyone who already has a Kindle or a family in the Amazon ecosystem, this consolidates classics, purchased Kindle books, and library loans (via Libby integration in the US) into one reader. The Android app supports X-Ray, Word Wise, and Whispersync for audio.
Where it falls short: No native EPUB browsing (Send to Kindle converts them). The interface promotes the store. Amazon can, in theory, remove books from your library (rare in practice).
Pricing: Free. Kindle Unlimited $11.99/mo for the subscription lending library.
Platforms: Android, iOS, Kindle e-readers, web, Windows, macOS.
Download: Aptoide · Google Play
Bottom line: The pick if you already have a Kindle device. Send to Kindle handles the public domain EPUBs cleanly.
2. Google Play Books, best for sideloading with Google account
Google Play Books accepts EPUB and PDF sideloads through Drive or a direct upload, syncs position across devices, and its store lets you filter by price = free, which pulls thousands of public domain classics. On a Chromebook, the same library is available in the browser.
For Android users who do not want an Amazon account, Play Books is the practical Google-side counterpart. Custom font support, night mode, and PDF text reflow make it usable for scanned books too.
Where it falls short: Sideloading UX is buried behind the Books app on the web. Position sync between third-party EPUBs is slower to update than Kindle. Some users find the reading engine less polished than Moon+ Reader for long fiction.
Pricing: Free. Play Books Pass not offered in most markets.
Platforms: Android, iOS, web, Chromebook.
Download: Aptoide · Google Play
Bottom line: The pick for Google-ecosystem users who want a straightforward reader plus a free-book filter.
3. Libby, best for public library loans
Libby by OverDrive is the app for anyone whose local library uses OverDrive: borrow ebooks and audiobooks for two weeks, no cost. In the US, UK, Canada, Australia, and much of Europe, this is a huge legal free-book pipe. Libby ships an intuitive shelf, adjustable loan periods, and Kindle integration for US libraries.
For readers whose local libraries participate, Libby is the pick most people underestimate. The catalog often includes recent bestsellers and classics both.
Where it falls short: Requires a valid library card in a participating jurisdiction. Some titles have waiting lists. Not a sideloader; only handles loans from OverDrive-affiliated libraries.
Pricing: Free. Loans free with library card.
Platforms: Android, iOS, web, Kindle.
Download: Aptoide · Google Play
Bottom line: The pick nobody thinks of first and everyone should have installed. Get a library card if you do not have one.
4. KOReader, best for power-user reading
KOReader is the open-source reader most Boox and Kobo owners run on their e-ink devices, and the Android port gives phones the same features: OPDS catalogs for direct downloads from Project Gutenberg and Standard Ebooks, per-book typography, Calibre integration, and cloud sync via Nextcloud, Dropbox, or FTP.
For anyone who wants to grab a book directly from the archive without visiting a website, KOReader is the pick. It reads EPUB, MOBI, PDF, DJVU, CBZ, and more, and its statistics panel tracks reading pace across the library.
Where it falls short: UI is dense and looks like an e-ink app on a phone screen. Setup takes an hour to get feeling comfortable. Not the pick for a casual reader.
Pricing: Free, open source, no ads.
Platforms: Android, Windows, macOS, Linux, Kobo, Boox, and other e-ink devices.
Download: F-Droid · Google Play
Bottom line: The pick for readers who want direct catalog access and are willing to spend an hour on setup.
5. Moon+ Reader, best feature-rich reader
Moon+ Reader is the long-time Android favourite that never lost its edge: EPUB, MOBI, AZW3, PDF, and TXT support, a beautiful reading engine with custom animations, and a built-in catalogue browser for public domain sources. Pro adds Google Drive and Dropbox sync, night themes, and text-to-speech that reads books aloud.
For anyone who wants one polished reader with granular typography controls, Moon+ Reader is the pick. Book stats, reading-speed tracking, and a proper library manager are all included.
Where it falls short: UI has aged; some screens look older than the underlying engine is. Pro is $6.99 but promoted heavily in the free version.
Pricing: Free with ads. Pro $6.99 one-time.
Platforms: Android.
Download: Aptoide · Google Play
Bottom line: The pick if KOReader is too heavy and Kindle is too Amazon. One-time price is fair.
6. LibriVox, best for free public-domain audiobooks
LibriVox is the public-domain audiobook archive: 20,000+ works read by volunteers, from Dickens to Dostoevsky to the US Constitution. The Android app streams and downloads with a proper library UI, chapter navigation, and adjustable playback speed.
For anyone who wants audiobook versions of classics without paying Audible, LibriVox is the pick. Narration quality varies (they are volunteers), but for well-known titles, the top recordings hold up.
Where it falls short: Narration is uneven; some recordings are painfully amateur. Free means ad-supported in the official app. Some titles have multiple readings; picking the best takes trial and error.
Pricing: Free.
Platforms: Android, iOS, web.
Download: Aptoide · Google Play
Bottom line: The pick for classics on your commute at zero cost. Skip the amateur readings; the good ones are worth the search.
7. Standard Ebooks Downloader, best for curated public-domain EPUBs
Standard Ebooks is the volunteer project that takes Project Gutenberg text, cleans it up (typography, formatting, missing footnotes), and republishes proper EPUBs under CC0. The Android downloader app (unofficial but well-maintained) grabs the catalog, downloads titles, and sideloads them to your reader of choice.
For anyone who cares about typography and cover art in public domain books, Standard Ebooks is the source. The downloader closes the last mile on Android.
Where it falls short: Not a reader itself; downloads sideloaded files for another app. Catalog is smaller than Project Gutenberg (few thousand titles vs 60,000+) because each book is hand-cleaned. Unofficial app, so long-term maintenance depends on the maintainer.
Pricing: Free, open source.
Platforms: Android.
Download: F-Droid · Google Play
Bottom line: The pick if you care about how a book looks. Pair with KOReader or Moon+ Reader for the reading part.
How to pick the right one
- If you own a Kindle: Amazon Kindle app plus Send to Kindle for EPUBs.
- If you live in the Google ecosystem: Google Play Books with the free filter.
- If your library uses OverDrive: Libby first, everything else second.
- If you want maximum control and direct catalog downloads: KOReader.
- If you want the polished middle: Moon+ Reader.
- For audiobook versions of classics: LibriVox.
- For beautifully typeset public domain EPUBs: Standard Ebooks Downloader plus KOReader or Moon+.
FAQ
What is the best free e-book reader for Android?
For most people, Amazon Kindle or Google Play Books cover 80% of use cases at zero cost. For power users, KOReader is the best free reader for Android in 2026 because it supports every format, syncs via open protocols, and connects directly to public-domain catalogs.
Where can I get free legal e-books?
Project Gutenberg (60,000+ titles), Standard Ebooks (curated re-typeset editions), Internet Archive (millions of scanned books), and your local public library (via Libby or Overdrive) are the four main legal free sources. All of them work with the readers on this list.
Do I need a Kindle to read Kindle books?
No. The Kindle Android app reads every Kindle book on your account, plus sideloaded EPUBs (via Send to Kindle) and MOBI files. Position sync works between the app and any physical Kindle you own.
What is Standard Ebooks and how is it different from Project Gutenberg?
Project Gutenberg hosts 60,000+ raw text public domain books. Standard Ebooks is a volunteer project that takes selected Gutenberg titles and re-typesets them as proper EPUBs with cover art, ligatures, and consistent formatting. Both are free and legal.
Can I use my library card for free e-books?
Yes, if your library uses OverDrive (most US, UK, Canadian, and Australian public libraries do). Libby is the free app that runs on your library card and gives you two-week loans of ebooks and audiobooks. Popular new titles have waitlists; classics rarely do.
How do I sideload EPUB files to Kindle or Google Play Books?
For Kindle, use the Send to Kindle web page or send the EPUB by email to your @kindle.com address. For Google Play Books, use the “Upload files” option in the Play Books web interface, and the book syncs to your Android app. Both accept EPUB and PDF.
