---
url: /errors/unsupported_document_type.md
---
# `unsupported_document_type`

## Description

The document type is not supported by the endpoint.

* OCR: the requested `documentType` is not in the OCR schema registry.
* Certification: the first bytes of the `document` are not those of a PDF (`%PDF-`), a PNG or a JPEG, and the declared type of the part is not `text/plain` or `application/json`. For a PDF, a PNG or a JPEG, the context reads the first bytes, not the declared type of the part.

## HTTP Status

`422 Unprocessable Entity`

## Typical Causes

* OCR: the caller supplied a document type outside OCR's supported schema registry.
* Certification: the file is a Word document, a ZIP or an archive, with a `.pdf` name or an `application/pdf` declared type.

## How To Fix

* OCR: send one of the document types published by the OCR extraction-request contract.
* Certification: send a PDF, a PNG or a JPEG, or send a UTF-8 plain text or a JSON document with the declared type `text/plain` or `application/json`. Convert other formats to PDF first.