Look it up instantly without leaving your page
Smart Lookup integrates entries from The New Oxford American Dictionary with information from X-Ray and Wikipedia, so you can access definitions, characters, settings, and more without losing your place.
Read more challenging books
Word Wise makes it easier to enjoy and quickly understand more challenging books. Short and simple definitions automatically appear above difficult words, so you can keep reading with fewer interruptions. Tap on a word to bring up a simple card with definitions, synonyms, and more. Available on many popular English language titles.
Build your vocabulary
Words looked up in the dictionary are automatically added to Vocabulary Builder to expand your knowledge and reinforce retention. Swipe through your vocabulary words, quiz yourself with flashcards, and instantly see those words in context.
Pick up where you left off
Whispersync technology synchronizes your last page read, bookmarks, and annotations across all your devices so you can pick up exactly where you left off reading.
Learn more about a book before you start reading
With About the Book, see background information about the author, other books in the series, and more.
Adjust your text size
Choose from eight text sizes to prevent tired eyes and keep you reading longer.
Share your library
With Family Library, you and your family can access and easily share not only your own Kindle books, but also books from the linked Amazon account of a spouse or partner.
Share with friends on Goodreads
With Goodreads on Kindle, you can connect with the largest online community of book lovers, see what your friends are reading, share highlights, and rate the books you read. Some Goodreads on Kindle features are only available when connected to Wi-Fi.
X-Ray lets you explore the "Bones of the Book"
See all the passages across a book that mention relevant ideas, fictional characters, historical figures, places, or topics of interest. The X-Ray timeline view lets you easily flip through notable passages to remind yourself of what’s happened in the book, or navigate easily through images.
Know how long it will take to finish that last chapter
Time to Read is personalized based on your reading speed, and is constantly updated as your speed and habits change. At a glance you’ll know how much time it will take to finish a chapter or book.
With a single tap, read the complete text of each footnote without losing your place in the book.
Translate passages instantly
Tap any word or highlight a section to instantly translate it into other languages, including Spanish, Japanese, and more. Translations are provided by Bing Translator.