ASP.NET PDF Redaction Library

Nutrient Web SDK is a JavaScript library for permanently redacting content in PDF documents (not just obscuring it). It is fully compatible with ASP.NET and offers developers a robust API to automate redaction, as well as a beautiful UI for creating, previewing, and applying redactions in any ASP.NET-based web app.

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Nutrient SDKs are deployed in some of the world’s most popular applications, such as those made by Autodesk, Disney, UBS, Dropbox, IBM, and Lufthansa.

Key capabilities

  • Create, preview, apply — Programmatically or using the UI

  • True redaction — Permanently remove content (not just obscure it)

  • Search and redact — For strings, preset patterns, or regex

  • Client-side — Redact directly in the browser (no server needed)

  • Customizable — Trigger workflows, adjust colors, and overlay text

  • Browser support — Works on all modern browsers and devices

  • Extendable — Add editing, bookmarks, OCR, and more

Guides for redaction

Introduction to redaction
Learn about the basics of PDF redaction

Programmatic redaction
How to use the API to programmatically redact content from PDFs

Redact preset patterns
How to automate redaction by searching for preset text patterns

Redact regex patterns
How to automate redaction by using regex patterns in text search

Search and redact
How to automatically create redactions based on search criteria

Built-in redaction UI
Learn about the document operations available in the redaction UI

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FAQ

Here are a few frequently asked questions about redaction in Nutrient Web SDK.

What types of content can be redacted with Nutrient Web SDK?

You can redact text and other content permanently from PDFs, ensuring it’s completely removed, and not just obscured.

How can I integrate redaction features into my app?

You can integrate redaction features using the robust API provided by Nutrient Web SDK.

Can redactions be applied automatically based on search criteria?

Yes, you can automate redactions by searching for text strings, preset patterns, or regex patterns.

Is it possible to customize the redaction process?

Yes, the redaction process is highly customizable, allowing you to adjust colors, overlay text, and trigger workflows.

Do I need server-side processing for redacting PDFs?

No, all redactions can be performed client side directly in the browser, with no server-side processing required.