# Extract Custom Metadata from PDF Files

You can extract custom metadata from PDF files either by specifying individual metadata tag names, or by extracting all custom metadata at once.

## Extract All Custom Metadata

You can extract all metadata through the API.

To extract all metadata by using the API

1. Create a `Session` object.

2. Call `custom_pdf_metadata(true)` on a `Configuration` object.

3. Invoke `metadata_map()` on a `Session` object.

See The Session Class for more information.

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