> 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/guides.md).

# Apryse Android SDK - PDF Library Guides

Discover Apryse's Android PDF Library - a powerful cross-platform SDK for creating commercial apps. View, edit, and annotate PDFs and Office files with ease. Trusted by startups, governments, and Fort

Apryse's Android PDF Library is a comprehensive cross-platform PDF and Office SDK that allows you to write stand-alone, cross-platform and reliable commercial applications. Using Apryse's Android SDK, you can build powerful Android apps that can view, edit, and annotate PDF, Microsoft Office, and other file formats.

Apryse’s fully supported SDK is trusted by thousands of innovative startups, governments, and Fortune 500 businesses (see [customers](https://apryse.com/customers)). Apryse technology is built from the ground up and is not dependent on any external third-party open-source software.

<a href="/android/samples/package-samples/sample-showcase.md" class="button primary">Online demo</a><a href="/android/get-started/get-started.md" class="button primary">Get started</a><a href="/android/get-started/samples.md" class="button primary">Samples</a><a href="https://pdftron.s3.amazonaws.com/downloads/PDFNetAndroid.zip" class="button primary">Download Now</a>

## New to Apryse Android SDK?

After you [checked out the demo](/android/samples/package-samples/sample-showcase.md), gone through [get started](/android/get-started/get-started.md), including [writing your own document viewer](/android/samples/cookbook/try-demo.md), here are some next steps.

### Customizable

* UI source code access for fine grained control over UX
* [Create custom annotations](/android/annotation/annotation/customization.md)
* [Change annotation appearance or behavior](/android/annotation/custom-annot-appearance.md)
* [Localization](/android/viewer/localization.md)
* [Rich set of APIs for more advanced customization](https://sdk.apryse.com/api/android/javadoc/reference/packages.html)

[FAQ](/android/get-started/faq.md) Get the answers to frequently asked questions.

## Basics

[Introduction to package](/android/viewer/viewer-overview.md) The document viewer is provided in three different forms.

[Introduction to components](/android/ui-customization/components-overview.md) Components available in the tools package.

[Introduction to annotation interactive tools](/android/annotation/tools.md) Each annotation type has an associated tool that can be customized.

[Localization](/android/viewer/localization.md) Built-in language support.

## Add more functionality

[File comparison](/android/compare-files/file-comparison-a.md) Visually compare pages.

[Collaborate in real time](/android/annotation/sync.md) Enable collaboration in real time to get things done.

[Add watermark](/android/editing-page-content/watermark-editor-a.md) Stamp custom watermark on each page of the document.

## Specialized topics

[Add custom view to a page](/android/ui-customization/custom-relative-layout.md) Add your own view on a page.

[Add custom annotation tool](/android/ui-customization/custom-tool.md) Create your own annotation creation or handling tool.

[Theme](/android/viewer/themes.md) Change colors of the viewer, switch to dark theme.

## Framework Support

* [Xamarin](/xamarin/get-started/xamarin-android/integrate-android.md)
* [React Native](/android/get-started/frameworks/react-native/react-native.md)
* [Flutter](/android/get-started/frameworks/flutter/flutter-1.md)

## File Type Support

See a full list of supported file formats here: [File format support](/android/learn-more/format-mobile.md).

## OS Support

* Android 4.1+ (API Level 16)

## Free Trial

* There are no feature limitations during the trial
* [Sign-up](https://dev.apryse.com) to get your trial key
* Chat with us on [Discord](https://apryse.com/discord?docLink=freDis)

## Samples

* [Package samples](/android/samples/package-samples/run-sample.md)
* [GitHub samples](/android/samples/github-samples.md)


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