> 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/annotation/annotation.md).

# PDF Annotation Library for Android

Discover the power of annotation tools with ToolManager - configure, import/export, sync, style, events, and more. Create, edit, and manage annotations effortlessly! The Apryse Android SDK streamlines

Annotations allow users to mark up and comment on PDFs without altering the original authors content.

Apryse SDK Benefits include:

* Infinite Undo/Redo
* Support for annotation flattening
* Support for annotation appearances
* XFDF Import
* Export annotations to FDF, XFDF, text, or PDF annotation summary
* Sticky (Note)
* Comments
* Text markup (highlight, squiggly, underline, strikeout)
* Add shapes (line, arrow, polyline, rectangle, ellipse, polygon, cloud)
* Cloud annotations
* Apply freehand ink annotations
* Signatures
* Save the annotations into the PDF file
* File attachments
* Sound, movie, and 3D annotations
* Support for custom annotations
* FreeText, Callout
* TextHighlight, TextUnderline, TextSquiggly, TextStrikeout
* Stamp
* Redaction

## Get started

[Annotation tools](/android/annotation/tools.md) An introduction to annotation tools and ToolManager.

[Config annotation tools](/android/annotation/toolmanager-config.md) To configure annotation tools using ToolManagerBuilder.

[Import/export annotations](/android/annotation/import-export.md) To import and export a full set of annotations in a document using XFDF.

[Annotation sync](/android/annotation/sync.md) To import and export a partial set of annotations in a document using XFDF.

[Annotation list](/android/annotation/annotation-list-a.md) To display a list of all annotations in a document.

[Annotation toolbar](/android/annotation/annotation-toolbar-a.md) To display a toolbar to create annotations and easily switch between different annotation tools.

[Style editor](/android/annotation/style-editor-dialog.md) To display a style editor where users can change annotation colors.

[Custom style editor](/android/annotation/customize-color-picker.md) To customize style editor dialog changing standard colors and presets.

[Style properties](/android/annotation/annot-style.md) To configure an annotations style properties such as border color, border thickness, fill color, and more.

[Default style properties](/android/annotation/annot-style.md) To configure default annotation style properties such as border color, border thickness, fill color, and more.

[Custom appearances](/android/annotation/custom-annot-appearance.md) To customize an annotations appearance such as with a custom image.

[Events/triggers](/android/annotation/toolmanager-events.md) An introduction to events and triggers available from the ToolManager.

[Custom event handlers](/android/annotation/intercept-annotation-handling.md) To customize event handling behaviour before executing or notified of actions as it happens.

[Read only mode](/android/annotation/pdf-read-only.md) To disable all interactions by enabling read only mode.

[Disable create/edit](/android/annotation/disable-annot-create-edit.md) To selectively disable creation or editing of annotations.

[Show/hide annotations](/android/annotation/show-hide-annot.md) To show or hide annotations altering the annotations visibility.

[Undo/redo annotations](/android/annotation/undo-redo.md) To undo or redo annotation modification events.

[Create annotations](/android/annotation/create.md) To create a variety of annotations including stick note (text annotations), link annotations, and more.

[Delete annotations](/android/annotation/delete-annot.md) To selectively delete annotations on a page or the whole document.


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