OpenStax (openstax.org) is a non-profit educational initiative based at Rice University that publishes free, peer-reviewed, openly licensed textbooks for introductory college courses. It covers biology, anatomy and physiology, chemistry, physics, calculus, statistics, economics, sociology, psychology, history, and more. All textbooks are written by subject matter experts, peer-reviewed, and updated regularly. They're used by millions of students worldwide and adopted by thousands of instructors.

Does OpenStax already provide EPUB downloads?

Yes — most OpenStax textbooks are available directly as EPUB files from the book's page (openstax.org/details/books/[book-name]). Click 'Get the book' and look for the EPUB download option alongside PDF and online reading. If the direct EPUB download has formatting issues on your e-reader, converting the PDF version via toolkit.bot often produces a cleaner reflowable result with better chapter navigation.

Which OpenStax textbooks are most popular for EPUB conversion?

The most widely used OpenStax texts include: Biology 2e, Anatomy and Physiology, University Physics Volumes 1–3, Chemistry: Atoms First, Calculus Volumes 1–3, Statistics, Principles of Economics (Micro and Macro), Introduction to Sociology, US History, American Government, Psychology, Precalculus, and College Physics. All are available as PDF and EPUB from openstax.org.

Are OpenStax PDFs good candidates for EPUB conversion?

Generally yes. OpenStax textbooks are well-structured with clear chapter and section headings, which toolkit.bot uses to build a navigable table of contents. The main limitation is equation-heavy texts (Calculus, Physics) where mathematical notation is rendered as images — these read fine in EPUB but equations appear as images rather than typeset text. For biology, economics, sociology, history, and psychology texts, conversion quality is excellent.

Can I use OpenStax textbooks in my course without paying?

Yes — OpenStax textbooks are published under Creative Commons Attribution (CC BY) or CC BY-NC-SA licences. They're completely free for students and instructors. There are optional low-cost print versions (printed and shipped at cost) and paid access codes for some ancillary materials, but the core textbook content is always free. Converting to EPUB for personal reading is explicitly permitted under the CC licence.

How to Download OpenStax Textbooks as PDF and Convert to EPUB for Kindle or Kobo (2026)

Updated June 2026 · Research

OpenStax publishes free, peer-reviewed textbooks for introductory college courses — used by millions of students. Most texts are available directly as EPUB from openstax.org. If the provided EPUB has formatting issues on your e-reader, or you prefer a cleaner reflowable version, converting the PDF at toolkit.bot produces a well-structured EPUB with chapter navigation. Here's how to do it and which subjects convert best.

OpenStax subjects available as free PDF and EPUB

Subject area	Example titles	EPUB conversion quality
Biology & life sciences	Biology 2e, Anatomy & Physiology, Microbiology	Excellent — narrative-heavy
Chemistry	Chemistry: Atoms First, General Chemistry	Good — equations as images
Physics & maths	University Physics, Calculus, Precalculus	Good — equations as images
Social sciences	Psychology, Sociology, US History, American Government	Excellent — text-heavy
Economics	Principles of Microeconomics, Macroeconomics	Excellent
Statistics	Introductory Statistics, Statistics (Shafer/Zhang)	Good — tables may simplify

How to download an OpenStax textbook and convert to EPUB

Go to openstax.org and find your textbook
Click 'Get the book' on the book's page
Check if a direct EPUB download is available — if so, download it and test on your e-reader
If PDF conversion is preferred, click 'Download a PDF'
Go to toolkit.bot/pdf2epub and upload the PDF
Download the EPUB with chapter navigation and send to Kindle by email or Kobo by USB

Frequently asked questions

What is OpenStax?: OpenStax (openstax.org) is a non-profit educational initiative based at Rice University that publishes free, peer-reviewed, openly licensed textbooks for introductory college courses. It covers biology, anatomy and physiology, chemistry, physics, calculus, statistics, economics, sociology, psychology, history, and more. All textbooks are written by subject matter experts, peer-reviewed, and updated regularly. They're used by millions of students worldwide and adopted by thousands of instructors.
Does OpenStax already provide EPUB downloads?: Yes — most OpenStax textbooks are available directly as EPUB files from the book's page (openstax.org/details/books/[book-name]). Click 'Get the book' and look for the EPUB download option alongside PDF and online reading. If the direct EPUB download has formatting issues on your e-reader, converting the PDF version via toolkit.bot often produces a cleaner reflowable result with better chapter navigation.
Which OpenStax textbooks are most popular for EPUB conversion?: The most widely used OpenStax texts include: Biology 2e, Anatomy and Physiology, University Physics Volumes 1–3, Chemistry: Atoms First, Calculus Volumes 1–3, Statistics, Principles of Economics (Micro and Macro), Introduction to Sociology, US History, American Government, Psychology, Precalculus, and College Physics. All are available as PDF and EPUB from openstax.org.
Are OpenStax PDFs good candidates for EPUB conversion?: Generally yes. OpenStax textbooks are well-structured with clear chapter and section headings, which toolkit.bot uses to build a navigable table of contents. The main limitation is equation-heavy texts (Calculus, Physics) where mathematical notation is rendered as images — these read fine in EPUB but equations appear as images rather than typeset text. For biology, economics, sociology, history, and psychology texts, conversion quality is excellent.
Can I use OpenStax textbooks in my course without paying?: Yes — OpenStax textbooks are published under Creative Commons Attribution (CC BY) or CC BY-NC-SA licences. They're completely free for students and instructors. There are optional low-cost print versions (printed and shipped at cost) and paid access codes for some ancillary materials, but the core textbook content is always free. Converting to EPUB for personal reading is explicitly permitted under the CC licence.