NASA Free E-Books: Download Them as EPUB (2026 Guide)
NASA Lets You Read and Download Hundreds of Free E-Books
NASA publishes a large, openly available e-book library, and it keeps growing coverage in 2026 as readers look for reliable, free EPUB sources that work on any device. The official NASA e-Books hub invites you to "read and download free NASA e-Books on the agency’s history, aeronautics research, science missions, and the International Space Station." Unlike most commercial ebook catalogs, NASA’s titles are genuinely free, carry no DRM, and are offered in open formats you can move between devices without any conversion trick or jailbreak.
In late August 2026 the collection got fresh attention from the tech press, with outlets highlighting that you can pull down hundreds of free NASA titles and load them straight onto a Kindle, Kobo, or tablet. For anyone building a personal EPUB library, this is one of the best no-cost sources around — and one of the few major publishers to hand you both EPUB and PDF downloads directly on each book’s page.
Here is what the NASA e-book library contains, how to download titles as EPUB, and how to get them onto the reader you already own.
What the NASA E-Book Library Includes
NASA’s e-book collection is organized into a few broad categories. On the main page you will find Aeronautics, NASA History, and Science, with the science section covering space missions, the Hubble Space Telescope, and the International Space Station. A rotating set of “Featured” titles highlights the most popular current books.
Notable, freely downloadable titles include Hubble’s Beautiful Universe, Hubble Science Highlights, Hubble: An Overview of the Space Telescope, and the Hubble Focus series covering gravitational lenses, black holes, the dark universe, strange new worlds, and the lives of stars. The history side carries year-by-year accounts from the Apollo era through the Shuttle program, and the aeronautics section covers NASA’s contributions to flight research.
Because these are official NASA releases, the photography and diagrams are unusually high quality for free e-books — full-resolution telescope imagery and mission illustrations that look excellent on a color e-reader or tablet screen.
EPUB, PDF, or Both: What NASA Hands You
The strongest reason to use NASA’s library is the file format. On each individual e-book page, NASA lists separate PDF and EPUB download buttons with the file size and date. For example, the Hubble “Beautiful Universe” volume offers a PDF download and a separate EPUB download, both updated in 2025 and both completely free.
| Format | Best for | NASA offers it? |
|---|---|---|
| EPUB | Re-flowable reading on Kindle, Kobo, PocketBook, tablet apps, font adjustment | Yes — direct per-title download |
| Fixed layout, print-style pages, image-heavy books on a larger screen | Yes — direct per-title download | |
| MOBI / AZW3 | Older Amazon Kindle devices | No — use EPUB and Send to Kindle instead |
EPUB is the smarter choice for most ereaders because it re-flows to fit your screen, lets you change font size and spacing, and stays readable on every modern device. If you only find a PDF edition you prefer, converting it to EPUB is straightforward with a tool like this free PDF to EPUB converter.
How to Download NASA E-Books as EPUB
Getting a NASA e-book onto a reader takes about two minutes. The whole flow works in any browser, needs no account, and costs nothing.
- Open the NASA e-Books page. Go to nasa.gov/ebooks and pick a category (Aeronautics, NASA History, or Science) or open a Featured title.
- Open a book. Click “Overview” on any title to land on its official e-book page with the download buttons.
- Choose EPUB. Click the EPUB download link. The file saves to your computer — no DRM, no Amazon account, no store checkout.
- Move it to your reader. On a Kobo or PocketBook, connect over USB and drop the file into the “Books” folder. On a Kindle, use Send to Kindle. On a phone or tablet, open the file in your favorite EPUB app.
Because the EPUB files are DRM-free, you are not locked to one device family. The same file opens on a Kobo, a PocketBook, a Boox, a phone, a tablet, or a computer — exactly the portability that DRM-free library building provides (see our DRM-free EPUB library guide).
Reading NASA E-Books on a Kindle
Kindle does not open EPUB files natively, but Amazon’s Send to Kindle service converts an EPUB for you and delivers it wirelessly. The EPUB format is the recommended input for Send to Kindle, so NASA’s EPUB files are the best fit here.
- Go to amazon.com/sendtokindle or use the Send to Kindle app.
- Drag the NASA EPUB file into the upload window.
- Send it to your Kindle (or the Kindle app) — Amazon converts it automatically.
- Wait a minute for the file to appear in your library, then open and read.
If you would rather do the conversion yourself with full control over the result, our Calibre to Kindle workflow walks through the whole pipeline, and the Calibre library management guide shows how to keep thousands of titles organized once your collection grows.
Kobo, PocketBook, Tablets, and Beyond
NASA e-books are a great fit for open-format readers because no DRM means no restrictions. On a Kobo or PocketBook you simply connect the device, copy the EPUB into the books folder, and eject — the device picks it up immediately. On Android or iOS, share the file to your reader app of choice, or save it to your files app and open it from there. For anyone comparing which device handles DRM-free EPUB best, the 2026 e-reader roundup is a useful starting point.
One caveat applies to image-heavy NASA books: science and Hubble titles are illustrated, and on a small monochrome e-ink screen the photos look better on a reader with a larger, higher-resolution panel or on a tablet. The EPUB version still reads fine everywhere; it is only the full-color photography that benefits from a bigger screen.
The Bottom Line
NASA’s free e-book library is a genuinely excellent, 100% legitimate source of DRM-free EPUB downloads. It covers aeronautics, space history, Hubble, and the space station; every title offers a direct EPUB and PDF download; and the files move freely between Kindle, Kobo, PocketBook, tablet, and phone. Since it costs nothing and requires no account, it is one of the best ways to start (or grow) a personal EPUB library without spending a cent.
Just download the EPUB, send it to your reader, and enjoy reading NASA’s own writing about the universe — free, and yours to keep.
Frequently Asked Questions
Are NASA e-books really free?
Yes. NASA publishes its e-books for free on the official nasa.gov/ebooks page. There is no charge, no account, and no checkout — you click the download button and the file saves directly.
What formats does NASA offer for its e-books?
Each NASA e-book page offers separate PDF and EPUB download buttons. EPUB is the better choice for e-readers because it re-flows text and adjusts fonts; PDF keeps a fixed print-style layout that suits larger screens.
Can I read NASA e-books on a Kindle?
Yes. Kindles do not open EPUB directly, but you can send the EPUB file to your device with Amazon’s free Send to Kindle service, which converts and delivers it wirelessly to your library.
Do NASA e-books have DRM?
No. NASA e-books are distributed without DRM, so you can copy them freely across your own devices and read them in any EPUB-compatible app or reader without restrictions.
What topics do NASA e-books cover?
The library spans aeronautics, NASA history, and science, including the Hubble Space Telescope, space missions, and the International Space Station, with featured titles like Hubble's Beautiful Universe and the Hubble Focus series.