Best On-Premises PDF Redaction Software

Apryse (formerly PDFTron) powers the future of document technology. We help businesses, developers, and enterprises handle documents with unmatched speed, accuracy, and security. Whether running in secure server environments or delivering seamless web-based experiences, Apryse makes document workflows smarter and easier. With Apryse, you can: Embed powerful document features directly into your apps — from viewing and editing to collaboration and compliance. Run at enterprise scale on secure server infrastructure, ensuring reliability without cloud dependencies. Deliver seamless in-browser document experiences with responsive, accessible, and feature-rich web capabilities. Trusted globally, Apryse empowers organizations to simplify operations, enhance productivity, and create exceptional document experiences.

Nutrient SDK brings permanent PDF redaction into your app, so sensitive content is truly gone, not just hidden under a black box that can still be copied or searched. Developers, compliance officers, and legal teams use it to remove PII and confidential details from contracts, court documents, and board packs before sharing or archiving, supporting GDPR and HIPAA obligations. Applying redactions irreversibly deletes the text, images, and vector graphics in each marked region. Content can be marked manually or found with exact-text search, regular expressions, and built-in patterns for emails, phone numbers, and credit card numbers. A mark-then-apply workflow lets reviewers check every redaction before anything is removed, with customizable overlay text and fill colors. Redaction runs client-side in the Web and mobile SDKs, so files stay on the device, or through self-hosted Document Engine for headless and batch processing.

Add a fully functional PDF editor to your ASP.NET website in minutes! Compatible with 99% of desktop & mobile browsers, from Internet Explorer 6 through the latest iOS Safari release, RAD PDF simply works. No plugins or other software needed. RAD PDF natively supports the most commonly used PDF features. Beyond a PDF reader, RAD PDF equips web applications with a browser-based PDF editor & PDF annotator. Features not even available in Adobe Acrobat Reader can be used to provide advanced PDF functionality. By enabling PDF form filling, PDF redaction, & PDF signing directly in the web browser, RAD PDF users can utilize PDF features without worrying about having the right platform or software installed! Allow your app to design new PDF forms, protect content, sign PDFs, & more using an intuitive graphical user interface (GUI). Client (JavaScript) and server APIs allow for endless possibilities .NET Core, Framework, & .NET 5+ supported Try editing any PDF with RAD PDF, FREE!

Pragma Redact is a browser-based tool for anonymizing PDF documents, plain text, and images before they are shared. It combines AI detection of context-dependent information, such as names and addresses, with pattern rules for formatted identifiers including account numbers, IDs, and email addresses. Image files can be processed with OCR. Users can review automatically placed masks, adjust them manually, and download a redacted PDF or copy cleaned text. Custom detection rules are also available. Processing runs locally in the browser after the detection model is downloaded, and files remain on the user's device. The tool is free to use without registration or a usage quota, and is suited to preparing support tickets, logs, reports, chatbot prompts, and other material for sharing.