The SEO Toolkit provides support for reading and writing metadata in various formats for HTML, images and PDF documents. The following list displays the supported metadata formats.

• HTML META tags, conveys hidden information about the document to the server and the client.
• Exif (Exchangeable Image File Format), the standard for storing interchange information in image files.
• IPTC Fields, the first multi-media news exchange format mainly used for photo metadata.
• Adobe XMP (Extensible Metadata Platform), an extensible, XML based metadata format.
• Native properties, a list of name-value pairs specific for a certain metadata format.

The actual metadata format used, depends on the type of the content being rendered. The following table describes the reading and writing support of metadata formats compared to the various types of content.