If you are on books.google.com , you are in the search/preview database. If you are on ://google.com , you are in the store/personal library interface.
Always verify the download finished before you go offline, especially if using the mobile app for a long flight.
Click on "Any view" in the search tools and select "Full view" to ensure you only see downloadable results. Select the Book: Click on the title to open the reader.
Open the Google Play Books app on Android or iOS. Tap the three dots on the book cover and select "Download." This saves the book for offline reading within the app.
Technically, Google does not provide a download button for books in "Preview" or "Snippet" mode to protect intellectual property. While third-party "Google Book Downloaders" exist online, they are often unreliable, may violate terms of service, and frequently provide low-quality image captures rather than searchable text.
These are typically public domain works (published before 1923-1928) or books where the publisher has granted full access. These can be downloaded in their entirety as PDFs or EPUBs.
Choose PDF if you want to see the original page scans (best for textbooks or illustrated works). Choose EPUB if you want "flowable" text that you can resize on a smartphone or e-reader.