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How to Convert PDFs to Images in the Browser Without Uploading Files

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Developers can convert PDF files to PNG or JPG images entirely within the browser using Mozilla's pdf.js library, eliminating the need to upload sensitive documents to third-party servers. The library, which powers Firefox's built-in PDF viewer, renders each PDF page onto an HTML canvas element that can then be exported as an image. A key technical consideration is resolution: PDFs are defined in points at 72 DPI by default, so developers must apply a scale factor to achieve sharper output, with 150 DPI recommended for screens and 300 DPI for print-quality results. When exporting to JPG, a white background must be painted first since the format does not support transparency, unlike PNG. The client-side approach offers privacy, speed, and zero backend costs, though rendering large documents at high DPI can be memory-intensive on the user's device.

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