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A PDF can contain both vector artwork and raster images, so a few pixelated areas do not necessarily mean the whole page was flattened. In Inkscape, filter effects such as blur and shadow are a documented reason that export may rasterize only the affected objects. Find which objects are blurry, identify whether they use filters or are bitmap images, then choose whether preserving appearance or keeping every element vector matters more.
Why does my SVG look blurry when I export it to PDF?
The exporter has to translate SVG features into instructions the PDF-writing path supports. When it cannot represent an effect as PDF vector operations, it may render the affected area as a bitmap to preserve its appearance. Inkscape’s Beginners’ Guide to exporting a PDF describes filtered objects as being turned into a “photo” for export.
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This can be selective: text and uncomplicated shapes may remain vector while a shadow or blur is rasterized. The Inkscape Beginners’ Guide puts the distinction plainly: “The PDF file format is a vector format that can also hold raster images.” A PNG or JPEG embedded in the SVG is already raster content; exporting it does not make it vector.
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Common causes to check
- SVG filters: blur, shadow, and other filter effects can be rasterized by Inkscape’s PDF export workflow.
- Embedded images: PNGs and JPEGs remain raster images in the PDF, regardless of vector export settings.
- Converter differences: exporters support different subsets of SVG. CairoSVG, for example, documents raster-image inclusion and partial filter support, so a result from one converter does not predict another’s. See its documentation.
- Fonts: text that looks different is a separate issue from rasterization. A converter may substitute fonts or lack support for font features used by the SVG.
Transparency is not a universal explanation. Adobe notes that flattening may be needed for some output scenarios, including specified legacy formats or formats that do not support transparency. That does not mean every modern SVG-to-PDF export must rasterize transparent artwork.
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How do I find which parts of the PDF were rasterized?
- Open the SVG in the editor and converter you intend to use for delivery.
- Inspect the PDF at high zoom. Note whether pixelation is limited to particular objects or areas, rather than assuming the entire page is rasterized.
- Return to the SVG and select those objects. Check whether they use blur, shadow, or another filter, or whether they are embedded bitmap images.
- Export a test copy with filter rasterization disabled, if the application offers that setting. Compare it with the original export. If the filtered appearance changes or disappears, the filter is implicated.
There is no universal all-vector verification method established for every exporter. If a recipient requires fully vector artwork, ask which preflight method they accept and use it on the final PDF.
How do I stop Inkscape from rasterizing filters?
In Inkscape’s PDF export dialog, inspect Rasterize filter effects. When enabled, filtered areas are rendered as raster images; the resolution setting controls their detail. The precise dialog and labels can vary by application version, so check the version you are using.
If you need the effect to look right
Leave rasterization enabled when necessary to preserve the filter’s appearance. Set the rasterization resolution for the intended output: the Inkscape guide gives 96 dpi as a common screen value and recommends at least 300 dpi for print use of filtered objects. Those values apply to the rasterized content, not to vector objects. A higher DPI can improve bitmap detail, but it does not turn the bitmap into vector artwork.
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Ask the printer or recipient what resolution they require, whether rasterized filter areas are acceptable, and whether they have other production specifications. A 600 dpi setting may suit some workflows, but it is not a universal requirement.
If the PDF must remain all-vector
Turn off Rasterize filter effects as a diagnostic, or when you can accept the changed appearance. Disabling it does not convert unsupported effects into vector equivalents; the effects may render differently or be omitted. For a dependable all-vector result, simplify or remove the filter, or rebuild the effect from vector features supported by the target exporter, such as shapes or gradients. Export again and inspect the result at high zoom. Confirm the final file with the recipient’s required preflight process if all-vector output is mandatory.
How should I handle text and fonts?
Check typography separately from filtered artwork. Inkscape’s PDF workflow can embed fonts when licensing permits, which helps preserve searchable text. For decorative lettering, converting text to paths avoids dependence on a recipient having the font, but the lettering is no longer editable as text and is not searchable as text.
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CairoSVG documents more limited font handling: it uses fonts installed in the execution environment rather than CSS @font-face references. If you use CairoSVG, ensure the needed fonts are installed and do not assume advanced font features or CSS font references will be honored. Ask the recipient whether searchable text or outlined lettering is preferred.
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| Approach | Appearance | Vector content | Best fit |
|---|---|---|---|
| Keep filter rasterization enabled | Preserves filter effects when the exporter cannot express them as PDF vectors | Filtered areas are raster; other supported artwork can remain vector | Appearance is the priority, and rasterized areas meet the recipient’s quality requirements |
| Disable filter rasterization without rebuilding effects | Filtered objects may change or disappear | Does not guarantee all-vector output or a faithful appearance | Testing whether filters cause the rasterization |
| Rebuild or remove unsupported effects | Can preserve a similar look, but requires checking the result | Can keep artwork vector if the replacement uses supported features | All-vector output is required and the target exporter supports the replacement |
Whichever approach you choose, test the actual editor, exporter, and recipient requirements together. Keep the editable SVG alongside the PDF: as the Inkscape Beginners’ Guide advises, “Never save as PDF only, but always keep an SVG file, because the PDF file format supports a different set of features from the SVG file format and you may lose data in the process.”
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