Building a Browser-Based PDF Blur Tool with JavaScript
javascript•Jul 24, 2026

Building a Browser-Based PDF Blur Tool with JavaScript

In this tutorial, you'll create a browser-based PDF Blur Tool using JavaScript, HTML Canvas, and PDF.js. Users can upload, preview, and blur sensitive information in PDFs, all without uploading files to a server.

freecodecamp

freecodecamp

Original source

Key summary

Learn how to build a browser-based PDF Blur Tool using JavaScript, allowing users to upload, preview, and blur sensitive information in PDFs without uploading files to a server.

TL;DR

  • Build a browser-based PDF Blur Tool using JavaScript
  • Use PDF.js to render PDF pages inside the browser
  • HTML Canvas to create and manage blur regions
  • PDF-lib to generate the final blurred PDF
  • Apply a visual blur effect over selected areas
  • Adjust blur intensity and apply to selected pages or entire document
  • Preview the final result and download the processed PDF
  • Maintain document privacy with client-side editing

This content is automatically summarized using AI. For full context, always refer to the original article.

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