GroupDocs.Redaction API References

This page serves as the entry point to the GroupDocs.Redaction API references.

GroupDocs.Redaction is a set of on-premise APIs that permanently remove or obscure sensitive content — text, metadata, annotations, image areas, and whole pages — from popular document formats such as PDF, Word, Excel, PowerPoint, and images, across multiple platforms. Because redaction is irreversible (the cleaned document can be rasterized to a PDF), it is the right tool for sharing, publishing, or archiving documents under privacy regulations such as GDPR and HIPAA.

Available Products

Select your target platform below to access detailed API code documentation.

Additional Resources

Product Overview

GroupDocs.Redaction is a comprehensive document-redaction SDK that gives developers full programmatic control over removing sensitive information — without requiring Microsoft Office, Adobe Acrobat, or any other third-party software. The same redaction engine is available for .NET, Java, and Python (via .NET), so you get consistent behavior across your whole stack.

Key Features

  • Text Redaction: Remove or black out text matched by an exact phrase (case-sensitive or right-to-left) or a regular expression — replace it with a string or draw a filled box over it.
  • Metadata Redaction: Erase metadata wholesale or by filter (author, company, title, …), or rewrite values that match a pattern.
  • Annotation Redaction: Rewrite or delete annotations, comments, and notes.
  • Image-Area Redaction: Black out a rectangular region of an image or scanned page and clean embedded image metadata.
  • Page Removal: Remove whole pages, slides, or worksheets.
  • Irreversible Rasterization: Flatten the cleaned document to a PDF (optionally PDF/A) so the removed content can never be recovered.
  • Redaction Policies: Bundle several redactions into a reusable policy and apply it across many documents.
  • No External Dependencies: Redact documents on-premise without Microsoft Office, OpenOffice, or Adobe Acrobat installed.

Supported File Formats

GroupDocs.Redaction supports a wide range of document formats:

  • Word Processing: DOC, DOCX, DOCM, DOT, DOTX, DOTM, RTF, TXT
  • Spreadsheets: XLS, XLSX, XLSM, XLT, XLTX, XLTM, CSV
  • Presentations: PPT, PPTX, PPSX
  • PDF Documents: PDF, PDF/A
  • Images: BMP, JPG, JPEG, PNG, GIF, TIFF

Common Use Cases

  • Legal & Compliance: Redact client names, case numbers, and privileged information from court documents before public release.
  • Healthcare: Remove patient identifiers from medical records while preserving clinical data for research.
  • Financial Services: Hide account numbers and personal details from loan applications shared with third-party vendors.
  • Government: Sanitize documents for Freedom of Information requests without compromising sensitive data.
  • HR & Employment: Redact salary information and personal details from employee records during internal audits.

Documentation and Downloads