Why SVG-to-PDF Exports Silently Rasterize and How to Prevent It
Converting SVG files to PDF should preserve vector paths, since both formats describe drawings using paths, fills, and transforms rather than pixels. However, most common conversion methods silently rasterize part or all of the document without any warning. Key pitfalls include mismatched page sizes due to SVG's pixel-based units versus PDF's physical units, missing fonts causing layout shifts, and unresolved external resources like linked images or stylesheets simply not appearing in the output. Advanced SVG features such as Gaussian blur filters, masks, and blend modes are also frequently flattened into bitmaps, even when the rest of the document remains vector. Addressing each of these issues — setting explicit page dimensions, inlining fonts and assets, and avoiding unsupported filter effects — is necessary to achieve a fully vector PDF export.
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