Where to Find Free Textbooks Online (Legally)

The average college student in the United States spends over $1,200 per year on textbooks. Multiply that by four years, and you're looking at nearly $5,000 — more than the entire annual tuition at some community colleges in other countries. And in much of the world, where local currency makes imported English-language textbooks prohibitively expensive, the barrier is even worse. A single calculus textbook from Pearson can cost more than a month's average income in Indonesia, Nigeria, or Brazil.

This is not an acceptable state of affairs, and thankfully, a global movement has been building to fix it. The Open Educational Resources (OER) movement, open access publishing, and progressive university policies have created a large and growing ecosystem of completely free, legally available textbooks. In this article, we'll walk you through 15+ sources for free textbooks — all legal, all at no cost, many written by the same professors who write the expensive commercial ones. If you've been following our series, you might also enjoy our guide to free programming books and our directory of free digital libraries.

Why Are Textbooks So Expensive — and Why Do Free Ones Exist?

Let's start with why the market is broken, because understanding this will help you appreciate why free alternatives are not just nice-to-have but morally necessary.

Commercial textbook pricing operates on a classic "price discrimination" model. Publishers know that once a professor assigns a textbook to their students, those students have effectively no choice but to buy it. Used book markets and rental services emerged as workarounds, but publishers responded with a series of tactics to eliminate them:

• Edition churn. Publishers release a new edition every 2–3 years with minimal substantive changes, specifically to make the previous edition unreturnable to the used book market.
• Bundling and access codes. Many new textbooks now come with access codes for online homework systems (MyMathLab, WebAssign, etc.) that expire after one use — effectively forcing every student to buy new.
• High margins. Publishers routinely mark up textbooks 300–400% above production cost. Author royalties are typically 10–15%, so the lion's share goes to the publisher and retail chain.

Enter the free textbook movement. There are several distinct groups creating and distributing free textbooks:

• Foundations. The Bill & Melinda Gates Foundation, the Hewlett Foundation, and others have funded OpenStax, Lumen Learning, and similar OER efforts.
• University departments. Professors who believe knowledge should be open often write free textbooks and release them under Creative Commons licenses.
• Governments. The U.S. Department of Education, state-level initiatives (Open Oregon, Open SUNY), and national programs in France, Germany, and Canada fund open textbook creation.
• Open source communities. Like Wikipedia, many free textbooks are collaboratively written by communities of volunteers.
• Public domain digitization projects. Works published before 1928 in the U.S. are in the public domain (varying elsewhere), and massive projects have digitized millions of these older but still valuable books.

The result: there are now thousands of free textbooks available in nearly every subject area, from introductory math to graduate-level quantum mechanics.

Top 15 Legal Free Textbook Sources

We've organized these by reliability and quality. Start at the top and work down.

1. OpenStax — The Gold Standard for College Textbooks

OpenStax is a nonprofit based at Rice University, funded primarily by philanthropic foundations, that publishes peer-reviewed college textbooks — for free. Every OpenStax textbook is:

• Peer-reviewed by faculty from multiple universities
• Written by leading experts in the field
• Available in PDF, EPUB, online reader, and (for a low cost print-on-demand) print
• Licensed under Creative Commons Attribution 4.0, meaning you can use, copy, adapt, and distribute it freely as long as you credit the authors
• Available in multiple languages (Spanish, French, Indonesian, and others)

OpenStax covers a surprising number of subjects. As of 2026, their catalog includes:

OpenStax textbooks are currently used in over 60% of U.S. colleges and universities for at least one course. Check with your professor — there's a real chance the expensive book they assigned has a direct OpenStax equivalent that covers the same material.

2. Project Gutenberg — Public Domain Classics

Project Gutenberg (gutenberg.org) is the oldest and largest public domain book digitization project on Earth. Founded in 1971 by Michael Hart, it now contains over 75,000 free ebooks. The catch: most are from the public domain (published before 1928 in the U.S.), so it's less useful for cutting-edge STEM textbooks but indispensable for the humanities, social sciences, and classic works of any field.

Great for: classics of literature, philosophy, economics, psychology (Freud, Jung, William James), mathematics (Euler, Gauss accessible works), history, and any older textbook that's entered the public domain. All legal, all free, multiple formats.

3. Internet Archive Open Library — The Big One

Open Library (openlibrary.org) is part of the Internet Archive project. It currently claims over 40 million scanned books in its catalog, though the legality of some is contested. However, their public domain and Creative Commons section is enormous and completely legal. Use the advanced search filters to limit to "public domain" or "Creative Commons" and you'll find millions of freely downloadable books, including many textbooks published before 1970 and many newer open textbooks.

Open Library also has a "Borrow" feature for some books where you can digitally "check out" a scanned copy for 14 days — this is a gray area legally, but it's how many people access books that are still under copyright. For 100% legal access, stick to the public domain filter.

4. Google Books — Free Previews

books.google.com is one of the most underutilized free textbook resources. Out of print books, public domain works, and publisher-provided sample chapters are all available here. Many textbooks have substantial free previews — sometimes 30–50% of the book — which is enough for most courses. And Google Books has a great "limited preview" feature that lets you search for specific terms within a book without buying it.

Pro tip: When your professor assigns a textbook, Google the title + "free PDF" + "filetype:pdf" and see what turns up. You'll be surprised how many authors (or their publishers) have posted free versions on university websites or personal blogs.

5. Standard Ebooks — Beautiful Public Domain Editions

Standard Ebooks (standardebooks.org) takes public domain books and produces meticulously proofread, beautifully formatted, DRM-free ebooks in EPUB, Kindle, and PDF formats. They're not textbooks, but they're the best free way to read classic works of literature, philosophy, and history that are often assigned in college courses. Moby-Dick, War and Peace, The Republic, Capital — all free, all professionally edited.

6. Wikibooks — Community-Written Textbooks

Wikibooks (wikibooks.org) is a Wikimedia Foundation project (same parent as Wikipedia) where volunteers collaboratively write textbooks. Quality varies enormously — some are excellent and used by actual universities, others are incomplete or rough. But for niche subjects that OpenStax doesn't cover, it's worth checking. Notably good: their computer science, programming, foreign language, and mathematics wikibooks.

7. MIT OpenCourseWare Textbooks

MIT OpenCourseWare (ocw.mit.edu) not only has free course videos and materials — many MIT professors have written and released complete textbooks as part of their OCW courses. Search for the course number + "textbook" or "readings". Some classic MIT textbooks available free this way include:

• Structure and Interpretation of Computer Programs (SICP) — MIT 6.001 textbook, complete HTML and PDF versions
• Introduction to Algorithms (CLRS) — complete PDF from MIT press
• Mechanics and Materials — MIT 2.001 textbook
• Principles of Digital Communication — MIT 6.451

8. University of Minnesota Open Textbook Library

The University of Minnesota maintains one of the best-curated open textbook catalogs in North America, at open.umn.edu/opentextbooks/AllTextbooks. Every book in their catalog has been faculty-reviewed, so the quality bar is high. They cover business, education, health sciences, humanities, math, science, and social sciences.

9. eBooks@Adelaide — Australian Classics

The University of Adelaide in Australia has digitized thousands of classic texts, including many science and mathematics classics that are difficult to find elsewhere free. Great for out-of-print works in the history of science, philosophy, and literature.

10. Free Book Library (freebooklibrary.com)

A curated directory of free books from legal sources. Aggregates content from Project Gutenberg, Internet Archive, OpenStax, and dozens of smaller open textbook providers. Useful as a search engine when you're looking for a specific book.

11. PDF Drive — Use with Caution

PDF Drive (pdfdrive.com) is a search engine for PDF files. Some are legally available; the legality of others is murky. We recommend using it only to find books you know are in the public domain or have been legitimately released by the author/publisher. When in doubt, stick to OpenStax, Project Gutenberg, or the Internet Archive's public domain section.

12. Library Genesis Alternatives — The Honest Talk

We need to have the honest conversation. Library Genesis, Sci-Hub, and similar shadow libraries provide access to millions of copyrighted textbooks for free. They are used by millions of students around the world — particularly in developing countries where textbook prices create an insurmountable barrier. Are they legal? Almost everywhere, no. Are they ethical? That debate is complex and ongoing.

What we can recommend are legal alternatives that serve a similar purpose:

• University library proxy access. If you're a enrolled student, your university library almost certainly has subscriptions to databases (JSTOR, ScienceDirect, ACM Digital Library) that provide free access to textbook chapters and papers. Learn how to use your library's proxy VPN.
• Preprint servers. arXiv.org, bioRxiv, and similar servers host the pre-peer-review versions of scientific papers, which are often free and very close to the published version.
• Unpaywall.org — A browser extension that automatically looks for legal open access versions of papers you find behind paywalls.
• Your local library's digital collection. Services like Libby/OverDrive let you borrow digital books including some textbooks.

13. Sci-Hub — The Ethical Discussion

We're addressing Sci-Hub directly because it's the elephant in the room. Sci-Hub provides access to over 88 million academic papers, including many textbook chapters. Alexandra Elbakyan, its founder, argues that publicly funded research should be freely accessible to the public who funded it. Publishers argue that they add value through peer review and editing that should be compensated.

Our position: we strongly prefer legal alternatives. But we also recognize that the status quo — where a molecule of knowledge costs more than a laptop for students in many countries — is unsustainable and unfair. We'll keep pointing readers to the legal resources first, and we encourage publishers and institutions to work toward making more content legally free.

14. Publisher Free Resources

Some publishers have free sections or preview programs worth knowing about:

• Pearson OpenStax partner program — Several Pearson textbooks now have OpenStax equivalents or companion materials.
• Cengage OpenStax partner program — Similar arrangement with OpenStax.
• Wiley Online Library — Some books have free chapter previews; look for the "preview" button.
• Oxford University Press — Free online resources for many textbooks at oxforduniversitypress.com.
• MIT Press Open Access — MIT Press has a growing open access collection at mitpress.mit.edu/books/open-access.

15. Other Notable Free Textbook Sources

• Lumen Learning (lumenlearning.com) — OER course materials and textbooks, some free, some low-cost ($10–$25).
• Open Oregon Educational Resources — A state-funded initiative providing free textbooks for Oregon community colleges.
• Athabasca University Press — Canada's open university publishes many textbooks freely.
• New Zealand eText Project — Free textbooks for New Zealand students, many available internationally.
• The Textbook Equity Project — Finds free textbooks corresponding to commonly assigned commercial ones.
• Saylor Foundation — Complete free university courses with associated textbooks.

How to Use These Free Sources Effectively

Having access to free textbooks is only valuable if you know how to actually use them. Here's our workflow:

1. Find your professor's syllabus first. Know exactly what textbook and edition they recommend.
2. Check OpenStax first. OpenStax has direct alternatives for many Pearson, McGraw-Hill, Wiley, and Cengage textbooks. The content is often very close to identical.
3. Check if your professor will accept an earlier edition. Earlier editions are often very similar in content but available free on Google Books or second-hand for a few dollars.
4. Check your university library. Many libraries now have "demand-driven acquisition" — request a book and they'll buy it for free for you to borrow digitally.
5. Use open textbooks to supplement. Even if you have to buy the professor's assigned book, supplement it with a free OpenStax alternative. Different explanations work for different minds.
6. Print selectively. You don't need to print the whole book. Most people find reading PDFs on a tablet or laptop works fine, and printing just the chapters you need saves money and paper.

Is It Legal? — FAQ

"Copyright exists to benefit creators and the public. When the public is priced out of access, the system has failed. That's why we build free alternatives." — OpenStax Mission Statement

Q: Are OpenStax textbooks really free? Are there any hidden costs?
A: 100% free in PDF/EPUB/online format. They sell print copies for about $25–$40 as a way to cover operating costs, but you never have to buy one.

Q: Can I legally download public domain books from Project Gutenberg?
A: Yes, absolutely. Everything on Project Gutenberg is either public domain or explicitly licensed for free distribution. They are extremely careful about copyright.

Q: What about downloading a textbook from a random blog?
A: Riskier. Some authors intentionally post free versions; others are unauthorized. If in doubt, don't use it.

Q: If my professor assigned a $200 Pearson textbook, should I tell them about OpenStax alternatives?
A: Absolutely! Many professors want to use free textbooks but don't know alternatives exist. Politely mention it. Professors who care about their students appreciate this.

Conclusion

We live in a world where a teenager in Jakarta with a smartphone can access a $300 calculus textbook for free, legally. That is remarkable. The free textbook movement is still young — it has covered math, science, and business best, but humanities and social sciences are catching up fast. We hope this guide saves you hundreds of dollars and hours of searching.

For more free resources, check out our guide to free programming books, our directory of free digital libraries, and our master list of free college courses. Knowledge wants to be free. Help it spread.