# Supported annotation types

Document Engine supports all common annotation types:

- [Link](https://www.nutrient.io/guides/document-engine/json/schema/annotations.md#pspdfkit-link)

- [Highlight](https://www.nutrient.io/guides/document-engine/json/schema/annotations.md#pspdfkit-markup-highlight-squiggly-strikeout-underline), [Underline](https://www.nutrient.io/guides/document-engine/json/schema/annotations.md#pspdfkit-markup-highlight-squiggly-strikeout-underline), [Strikeout](https://www.nutrient.io/guides/document-engine/json/schema/annotations.md#pspdfkit-markup-highlight-squiggly-strikeout-underline), [Squiggle](https://www.nutrient.io/guides/document-engine/json/schema/annotations.md#pspdfkit-markup-highlight-squiggly-strikeout-underline)

- [Text](https://www.nutrient.io/guides/document-engine/json/schema/annotations.md#pspdfkit-text)

- [Callout](https://www.nutrient.io/guides/document-engine/json/schema/annotations.md#pspdfkit-text)

- [Ink](https://www.nutrient.io/guides/document-engine/json/schema/annotations.md#pspdfkit-ink)

- [Ellipse](https://www.nutrient.io/guides/document-engine/json/schema/annotations.md#pspdfkit-shape-ellipse), [Rectangle](https://www.nutrient.io/guides/document-engine/json/schema/annotations.md#pspdfkit-shape-rectangle), [Line](https://www.nutrient.io/guides/document-engine/json/schema/annotations.md#pspdfkit-shape-line), [Polyline](https://www.nutrient.io/guides/document-engine/json/schema/annotations.md#pspdfkit-shape-polyline), [Polygon](https://www.nutrient.io/guides/document-engine/json/schema/annotations.md#pspdfkit-shape-polygon)

- [Note](https://www.nutrient.io/guides/document-engine/json/schema/annotations.md#pspdfkit-note)

- [Widget](https://www.nutrient.io/guides/document-engine/json/schema/form-fields.md) (requires the [Form Filling component](https://www.nutrient.io/guides/web/forms.md))

- [Image](https://www.nutrient.io/guides/document-engine/json/schema/annotations.md#pspdfkit-image)

- [Stamp](https://www.nutrient.io/guides/document-engine/json/schema/annotations.md#pspdfkit-stamp)

- [Redaction] (requires the [Redaction component](https://www.nutrient.io/guides/web/redaction.md))

- [Media](https://www.nutrient.io/guides/document-engine/json/schema/file-attachments.md)

These are standard annotations (as defined in the PDF Reference) that can be read and written by many apps, such as Adobe Acrobat and Apple Preview.
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## Related pages

- [Understand annotation data formats for PDFs](/guides/document-engine/annotations/introduction-to-annotations/data-formats.md)
- [Understanding PDF annotations and their types](/guides/document-engine/annotations/introduction-to-annotations/what-are-annotations.md)