Image to PDF Quality: Control Resolution and Compression
Control the quality of images embedded in PDFs. This guide covers DPI, JPEG compression levels, and page margins when converting images to PDF.
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Tags: pdf, developer-tools, conversion, images
Image to PDF Quality: Compression vs File Size Tradeoffs Every image-to-PDF conversion involves a quality decision. You are either preserving the original image data exactly (lossless) or sacrificing some detail to achieve a smaller file (lossy). Understanding how jsPDF and pdf-lib handle image quality — and how JPEG compression behaves inside PDFs — lets you make informed trade-offs rather than blindly accepting defaults. How Images Are Stored Inside PDFs A PDF is fundamentally a container format. When you embed an image in a PDF, the image data is stored as an XObject (external object) stream inside the PDF file. The compression applied to this stream determines both the quality and file size. JPEG Images in PDFs JPEG images are stored in PDF as DCTDecode streams — the raw JPEG data,…
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