> For the complete documentation index, see [llms.txt](https://docs.apryse.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.apryse.com/android/open-save-document.md). # Open/Save Document - [Basic document operations in Android](https://docs.apryse.com/android/open-save-document/basics.md): Learn how to open, save, and lock PDF documents in a multithreaded environment. Get started with these essential document management tips! The Apryse Android SDK streamlines secure document processing - [Rotating PDF Pages in Android](https://docs.apryse.com/android/open-save-document/basics/rotate-pdf.md): Learn how to easily rotate PDF pages using Apryse's library. Rotate pages dialog offers two options for temporary or permanent rotation. Find out more here! The Apryse Android SDK streamlines secure d - [Cropping PDF pages in Android](https://docs.apryse.com/android/open-save-document/basics/crop-pages.md): Cropping PDF pages in Android is easy with the Apryse library, you can crop pages manually or automatically, as well as reset document pages to their original size. The UserCropDialogFragment allows a - [Open a document](https://docs.apryse.com/android/open-save-document/open.md): Learn how to open a document in an Activity, fragment or view with PDFViewCTRL using Apryse's Android SDK. Follow Material design guidelines for a seamless experience. The Apryse Android SDK streamlin - [Display documents using PDFViewCTRL with Apryse Android SDK](https://docs.apryse.com/android/open-save-document/open/view.md): Learn how to open a document with PDFViewCTRL using Apryse Android SDK. View, annotate, sign, and edit PDFs with fragment in tabs. Follow Material design guidelines for a seamless experience. The Apry - [Display documents in Fragment with Apryse Android SDK](https://docs.apryse.com/android/open-save-document/open/fragment.md): Learn how to open a document in Fragment using Apryse's Android SDK. View, annotate, sign, and edit PDFs with fragment in tabs. Follow Material design guidelines for a seamless experience. The Apryse - [Open documents using Activity with Apryse Android SDK](https://docs.apryse.com/android/open-save-document/open/activity.md): Learn how to open a document in an Activity using Apryse's Android SDK. View, annotate, sign, and edit PDFs with DocumentActivity. Follow Material design guidelines for a seamless experience. The Apry - [Saving documents in Android](https://docs.apryse.com/android/open-save-document/save.md): Learn how to save PDF documents using PDFNet's saving APIs from the PDFDoc class. Save to local storage, external storage, or incrementally for faster saving. Explore different saving modes for optimi - [Lock a PDF document in Android](https://docs.apryse.com/android/open-save-document/lock.md): Learn how to efficiently manage PDF document instances across multiple threads with Apryse SDK locking mechanisms. Ensure stable performance and prevent crashes by implementing reentrant mutex and rea - [Code samples for basic document operations in Android](https://docs.apryse.com/android/open-save-document/samples.md): Learn how to read & write a PDF file from/to memory buffer, merge, copy, delete, rearrange PDF pages, and embed elements with this comprehensive guide. The Apryse Android SDK streamlines secure docume - [APIs for basic document operations in Android](https://docs.apryse.com/android/open-save-document/apis.md): Discover utility classes for basic PDF operations in Android using com.pdftron.pdf.PDFDoc. Enhance your PDF document handling with Java/Kotlin. 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