Document APIs
Choose a document comparison endpoint
Diffchecker exposes three document comparison APIs. Use Plain Text for a text-focused PDF response, choose Rich Text for PDF geometry and visual output, or choose Redline for a DOCX with Microsoft Word tracked changes or a change list of its edits.
/document/plaintextPlain Text
Plain-text PDF diff output for quick integrations that want the familiar Diffchecker-style JSON or HTML response.
Best when you want a simpler, text-focused diff shape.
Good fit for standard review flows and lightweight integrations.
Matches the plain-text document diff behavior already used elsewhere in the product.
/document/richtextRich Text
Structured PDF diff output with polygons, page images, visual-content comparison, and export-ready HTML or PDF.
Best for custom viewers, overlays, and downstream automation.
Includes geometry and page metadata for precise rendering.
Adds richer output modes, including PDF export and visual object comparison.
/document/redlineRedline
Upload original and revised DOCX files and download a revised-document-based Word file containing Microsoft Word tracked changes, or get the changes as a Markdown or JSON change list.
Best for legal and business review workflows in Microsoft Word.
Change lists let people and AI agents read every change without opening Word.
Bills from the larger compressed DOCX after output generation and before delivery.