If you are passionate about reading digitally and have your mobile phone or tablet full of books, Mastering organization is the key to enjoying Truly your library. There's one app that shines above the rest when it comes to organization, formats, and convenience: ReadEra. And if we add more advanced management from your computer with Calibre, you can always have your works located, well labeled and ready to read without friction.
In this guide we're going to combine the best of both worlds: Hands-on experience with ReadEra for Android—fast, free, and ad-free—and Calibre's powerful desktop features for cataloging, converting, and transferring eBooks to your devices. You'll also see tips for reading on mobile with less eye strain, interesting alternative apps and a list of legal sources with free e-books to get you started today.
What is ReadEra and why is it ideal for organizing?
ReadEra is a book and document reader that works offline and does not require registration or display ads. This already gives it an advantage: you open, read, and organize, without interruptions or internal purchases. The app's focus is on offering a smooth reading experience and a efficient library manager, all in the same package.
One of its great strengths is compatibility: supports PDF, EPUB, Microsoft Word (DOC, DOCX, RTF), Kindle (MOBI, AZW3), DJVU, FB2, TXT, ODT, and CHM, even when they're inside ZIP files. That is, you can download a compressed book and ReadEra will open it without unzipping, which is very convenient when you manage large collections or grouped files.
Reading multiple formats, really
The app combines the advantages of several specialized readers: as a PDF viewer, it has margin cutting and a single-column mode that splits scanned double-page spreads in two for comfortable reading. Reading heavy PDFs is no problem: opens very large documents with ease, and zooming in PDF and DjVu is smooth.
With EPUB and MOBI, ReadEra take advantage of the native virtues of these formats eBooks (resizing, text flow, fonts, etc.). In Word documents, the app creates the table of contents from the titles, and with FB2 it is able to read directly from a ZIP file, without any prior steps. In short, a single reader for books, magazines, articles and manuals in the most common formats.
Library Manager: Auto-Discovery, Collections, and Lists
So that keeping things organized isn't an extra job, ReadEra automatically detects books and documents that you download to your device. You can navigate through folders and downloads easily, without having to manually import each file. The app then groups them by author and series, which greatly simplifies tracking of sagas or collections.
Additionally, you can create lists like To read, Read and Favorites, and create thematic collections with its shelving tool. A key detail: the same book can belong to multiple collections at once, which is useful if, for example, you want to classify by genre and by author without duplicating files.
Navigation within the book and full control
ReadEra provides quick access to reading settings, table of contents, bookmarks, highlights, quotes, notes, and page history. You can jump using the progress bar or a page pointer, which speeds up return to an exact point when you are consulting.
In formats such as Epub, Mobi, Docx and Fb2, the Footnotes appear printed at the bottom of the page, just like a paperback book. This improves concentration because you don't have to open pop-up windows. You'll also see the total number of pages in the book and, separately, the pages of the chapter you are on, perfect for measuring your real progress.
Reading options that take care of your eyes
The app automatically saves the current page, and offers color modes day, night, sepia and console, so you can choose the contrast that suits you best. You can turn the page horizontally or vertically, and adjust the screen orientation, brightness, and margins —also in PDF and DjVu— to adapt the presentation to each document.
At the typographic level, you will have control over source, size, thickness, line spacing and even scripted in Epub, Mobi/Azw3, Fb2, TXT, and ODT. Combining these settings with PDF/DjVu zoom allows you to set up a highly readable experience, whether you read narrative or consult technical manuals.
Efficient use of memory and smooth continuity
ReadEra does not duplicate your files in its own storage, so avoid taking up unnecessary space and also detects duplicates. The most interesting thing is that preserves bookmarks and progress Even if you move or delete files, if you download them again, you'll resume from the last page you read, without losing anything.
If you need to free up internal storage, the app allows you to save data to the SD card. This philosophy of not touching your files and maintaining the reading state makes ReadEra ideal for large libraries where you manage content outside of the reader.
Reading multiple documents at once: multi-document mode
When you study or compare texts, you'll appreciate the multi-document mode. ReadEra allows open multiple books simultaneously and place them in split screen (two windows) if your device supports it. So, for example, you can read an EPUB and a PDF at once.
If you prefer to switch, you can switch between Word, ODT, PDF, Epub/Mobi and Kindle books using the system button «active apps». This form of multitasking is especially useful for cross-reference notes, compare appointments or review sources.
Free, no registration required, and with optional premium version
The application was developed by READERA LLC. According to available information, There is a free version without ads no obligation to register or use external services, and a paid premium edition around 8 USD. Some materials indicate that is distributed under the GNU GPL license, reinforcing its open vocation.
Beyond the model, the reality of use is clear: download it, open it, read it, and organize it. Installing it from Google Play takes just a couple of minutes., and its speed and intuitive interface make it very accessible even if you haven't used readers before. One detail that caught the attention of several users is its ability to open documents directly from ZIP, something unusual and tremendously practical.
Using your mobile phone or tablet as an eReader: key tips
An e-ink reader is unbeatable in visual comfort, but with a mobile phone or tablet and a good app, you can get very close to that experienceKeep in mind that backlit screens are more tiring, so you may want to adjust some settings to help you read for long periods of time with less fatigue.
Start by trusting the reading modes and app settings: These usually optimize contrast and color to reduce eye strain. If you still experience eye strain, adjust the brightness manually and adapt it to the ambient light: less light in the room, less glare on the screen.
Activate reading mode or night mode of the system if you have it: reduces blue light and warms the tone, something that many of us find more pleasant to read. And spend a few minutes setting up the app: fonts, sizes, margins, and a way to move on. These small decisions make a big difference.
Don't stick with the first app you try. Explore various alternatives and choose the one that best suits your habits. If you're interested in a free version with ads, consider the paid version to remove ads and unlock extras. It also helps to keep your library organized: clear folders and consistent names will save you time.
Popular Apps: ReadEra Alternatives and Add-ons
Amazon Kindle offers a very polished app, designed primarily for its store, although it allows customize font, size and brightness, highlight, and look up dictionaries. If you're shopping on Amazon, it's a solid choice for its ecosystem and synchronization.
Google Play Books works on Android and iOS. It's not the most comprehensive, but in addition to Play Store purchases accepts PDF and third-party books. It has bookmarks, read aloud, offline dictionary, dark mode and page turning with the volume keys.
Apple Books is more closed and oriented to its own store, although you can import PDF or ePub on your own. It stands out for its daily reading goals, a practical way to create reading habits if you need a push.
Kobo Books is the natural alternative to Kindle, with its own store and personalized recommendations according to your tastes. If you already have a Kobo eReader, integration is its strong point.
Moon+ Reader, only on Android, is one of the most customizable apps: more than ten topics, support for multiple formats and online libraries, as well as different ways to turn the page and autoscroll mode. It has a free version and a paid Pro version.
KyBook 3, exclusive to iOS, supports most book and comic formats, access to OPDS catalogs —including .onion support—, annotations, cloud saving and text to speech to convert books into audiobooks.
ReadEra, as we have already seen, stands out on Android for being free and ad-free, with support for the most commonly used formats and advanced sorting options by author and series. It's one of the apps best rated in the Google store.
Lithium for Android stands out for its very cheap Pro edition, automatic book detection, scroll or page display modes, and tools for underlining and notes.
eReader Prestigio, also on Android, combines an elegant interface with support for popular formats, sync between devices with a user account and access to your own store. You can connect to Dropbox or Google Drive to read from the cloud.
Free and legal e-books: where to get them
If you need to stock your library with free titles or free promotions, there are several trusted sites. These are some of the most useful ones to find works in the public domain or out of copyright, and even temporary offers:
- Amazon.com: Search for “Free Books” and add classics and other titles to your account at no cost.
- The book house: also offers books free of charge; be careful because some ePubs have DRM.
- Project Gutenberg: Over 60.000 free books on Kindle and ePub, in multiple languages.
- National Library of Spain: portal with scanned documents (drawings, photos, books, prints).
- Biblioteca Virtual Miguel de Cervantes: wide catalogue, although many are not in eBook format and require converting them.
- Bubok: self-publishing; most paid, but There are also free titles.
- literanda: classics in electronic format and free; allows you to discover new authors.
- OpenLibra: free digital library, with a focus on technical and computer topics.
- eReader Cafe: list free books coming to Amazon (especially in the US store).
- bookbub: collects Temporary offers with free eBooks by genres.
- Open Library: huge catalog of copyright-free classics, with Multiple formats and online reading.
- Open Culture: blog that aims to more than 800 free eBooks hosted on other websites.
- eBiblio: public platform of eBook lending in Spain, managed by regional networks.
- Book Lending: Temporary e-book loans (in English).
- manybooks.net: large database of free eBooks in English, with user reviews.
Calibre on your computer: advanced organization and conversion
Calibre is the best companion for your eReader or ReadEra: it's free, it's translated to Spanish and works on Windows, macOS, and GNU/Linux. It allows you to organize, convert, transfer, and even create eBooks, with a very wide range of options.
To get started, add your books: from a single directory with the "Add books" button or from a compressed file with "Add multiple books from one file». If you've received their library in RAR/ZIP, this is a quick way to import them without unzipping them individually.
A little-used function is "Get books», which automatically searches the web for DRM-free titles and adds them to your library. For paid books, Calibre shows you prices in stores and sends you to the corresponding website to complete the purchase outside the app.
With many projects, having everything organized is vital. You can create a new library from the "Calibre Library" button and choose the storage path, or move the library to another location (e.g. a cloud folder) using the built-in function, better than copy and paste to avoid mistakes.
There are also virtual libraries, smart filters that work on your collection to segment it without duplicating anything. For example, you can generate a view with a whole saga using tags or metadata, and that “sub-library” will update itself.
Metadata is the heart of order in Calibre: author, series, saga number, synopsis… With “Modify metadata» you edit a specific book and you can, for example, set the order number in a series to appear in sequence on your eReader. If you want to go faster, use "Modify metadata in bulk» to complete common fields or make search for and replace in batch.
Are you missing data or a cover? Calibre can download metadata and covers automatically. Under "Download cover art," consult libraries like Amazon and Google to suggest images; and with "Download all metadata» (shortcut Ctrl+D or Cmd+D) completes key information from multiple books at once. Check «Configure download» to choose which fields and sources you want to use.
When it comes to transferring books to your device, there are two scenarios. If your reader is supported, when you connect it via USB you'll see a "Device» with its catalog and you will be able to drag books. If it isn't, use "Connect & Share" > "Connect to a folder» so that Calibre can export the eBooks there; it also works with microSD cards on compatible eReaders.
With Kindle, in addition to the USB connection, you can send books by mail to your name@kindle.com address and will be downloaded when the reader connects to Wi-Fi. Set this up in Preferences > «Sharing books via email» and remember to use compatible formats like AZW3, DRM-free MOBI, PRC, TXT or PDF, among others.
If there are incompatibilities, convert. Select one or more books and press "Convert books». In «Page Setup» choose a Kindle output profile (or that of your eReader) and, in «Exit AZW3», define options such as compressing content or suppressing index if applicable. If you are going to repeat this flow, leave a fixed conversion by default in Preferences > Common Options.
ReadEra + Calibre: a complete workflow
The tandem is simple: manage massively in Calibre (metadata, covers, series, conversions) and Read and organize your daily life with ReadEra on your mobile or tablet. It will detect what you download, keep your progress even if you move files, and will allow you to create collections and lists on the fly.
If you usually study or prepare for exams, take advantage of the multi-document mode ReadEra with a split screen and alternates with annotations and summaries. In Calibre, it supports this routine with virtual libraries by subject, and well-kept metadata to locate each topic in seconds.
And if you come from an opinion article where the app was recommended during confinement, you will see that many agree: it is fast, intuitive, with pleasant color modes and a distraction-free experience. Users like José Luis Ropero underlined their ability to read from ZIP like a before and after in its flow.
All this, added to a selection of alternative apps and free fonts, leaves you the path clear to build a robust digital library: well classified, accessible, and with a reading experience that It doesn't force you to change tools Every two for three.
With these pieces fitted together, you have a powerful and frictionless solution: ReadEra for reading and sorting on the go, Calibre for polishing and converting on the desktop, practical tips for reducing fatigue on mobile or tablet, complementary applications according to your ecosystem and a good list of legal websites with free books. This way, your digital library stays clean, your series are neatly organized, and each format opens where it should. No ads, no registrations, and no headaches. Share this guide and more users will learn about the tool..
