If the e-book app on your phone or tablet is overflowing and full of outdated files, use these tools to tidy it up.

With the arrival of iOS 4, the iPad, and iTunes 9.2, iTunes can now manage e-books for syncing to Apple’s iBooks app. iTunes accepts two types of book files: those in ePub format, and PDF files.

Go to the book settings (the book icon next to the Buy Book button). Click Change Theme button. How to preview a book. In the main window, right-click on the area surrounding the pages.

That now includes Amazon’s iOS Kindle app. Contrary to prior limitations, there is now a prominent orange “Get book” button on Kindle app’s book listings.