Learn how to send EPUB files to your Kindle using email, the Kindle app, Send to Kindle, or USB. Compare every method and troubleshoot common issues.

Learn how to archive old file formats, prevent data loss, and access legacy documents with practical tips for long-term digital preservation.

A small update to keep Documents fast and focused. We’re removing a few features to simplify the app and improve performance, so you can manage your files more efficiently.

Documents is now backed by ISO 27001-certified security, giving you even greater confidence that your files and data are protected by internationally recognized security practices.

Your Readdle Account gives you seamless access to your subscriptions across supported apps. Learn how it works, how to manage it, and what to know before making changes.

Documents is coming to the web. With Documents.io, you can now convert, compress, and manage your files directly in your browser, with the same simplicity you know from the app. One experience, available wherever you work.

Learn the difference between video file formats (MP4, MKV, AVI, MOV, WebM) and codecs (H.264, H.265, AV1). Find out which format is best for social media, professional editing, and universal compatibility in 2026.

JPG and PNG look similar, but they serve different purposes. Learn the real difference in size, quality, transparency, and when to use each format.

Learn what Adobe Illustrator files are, their role in vector design, and how to open or convert them without the expensive software.