Build a Browser-Based PDF to Grayscale Converter with JavaScript
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EDITOR BRIEF
This tutorial shows how to create a PDF-to-grayscale tool that runs in the browser. Users can upload a PDF, preview pages, choose conversion options and pages, then generate and download a new grayscale file without sending the document to an external server. It uses PDF.js to display pages, the Canvas API to change pixels, and PDF-lib to create the final PDF.
INSIGHTS
This is a practical example of client-side file processing, which is useful for privacy and speed. A good next step is to build a small page preview app first, then add canvas-based grayscale conversion and PDF export.
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