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Why does my SVG look blurry when I export it to PDF?
An SVG-to-PDF exporter has to translate the SVG’s features into what its PDF-writing process supports. If a feature cannot be represented in that export path as vector instructions, the exporter may render the affected object or area as a bitmap so its appearance is retained.
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Inkscape’s Beginners’ Guide explains that “The PDF file format is a vector format that can also hold raster images.” A PDF is therefore not necessarily all-vector, and seeing pixels in one part does not mean every vector on the page was flattened.
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Filters can trigger selective rasterization
Blur, shadow, and other SVG filter effects are common causes. Inkscape documents filter effects as objects that may be rasterized in its PDF export workflow. The raster fallback can be limited to filtered objects or areas rather than the whole page.
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Embedded photos and other bitmaps are already raster
A PNG or JPEG placed in an SVG remains a raster image when exported to PDF. Vector export settings cannot turn its pixels into vector paths. If the image itself looks soft, check its original resolution and how large it is displayed in the document.
Other features depend on the exporter
SVG and PDF do not support identical feature sets, and converters implement different subsets. CairoSVG, for example, documents raster-image inclusion and partial filter support. A result from one exporter does not establish how another will handle the same file.
Transparency also needs a precise diagnosis: it does not mean every modern SVG-to-PDF export must rasterize. Adobe’s Illustrator documentation describes transparency flattening for some output scenarios, including specified legacy formats or formats without transparency support. That is not a blanket rule for all PDF exports.
How do I find out which parts were rasterized?
- Open the SVG in the editor you plan to use for export. Compare the PDF with the SVG and note the specific objects or regions that look pixelated.
- Inspect those objects in the SVG. Look for blur, shadow, or another filter effect. Also check whether the object is an embedded bitmap rather than vector artwork.
- Check the exporter’s PDF settings. In Inkscape, look for Rasterize filter effects in the PDF export dialog. When enabled, filtered areas are rendered as raster images.
- Export a test and inspect it at high zoom. Compare the filtered area, ordinary shapes, and text separately. A pixelated photo alongside sharp paths is consistent with mixed raster and vector PDF content.
How do I stop Inkscape from rasterizing filters?
In Inkscape’s PDF export dialog, turn off Rasterize filter effects to test whether the filtered objects can be exported without that raster fallback. This is not a universal fix: disabling rasterization can make the effect look different or disappear because the PDF export path may not reproduce that SVG filter as a vector.
If all-vector output is a requirement, simplify or remove the filter, or rebuild the appearance with vector shapes, gradients, or other constructs supported by the target exporter. Export again and inspect the result. If a printer or recipient requires all-vector artwork, ask which preflight method they require; there is no single verification tool established for every workflow.
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| Priority | What to do | Trade-off |
|---|---|---|
| Preserve appearance | Keep filter rasterization enabled when needed and set an appropriate rasterization resolution for the output. | The filtered content remains raster, even if it looks correct. |
| Keep artwork all-vector | Disable rasterization as a test, then remove or recreate unsupported effects with PDF-compatible vector elements. | The appearance may change; inspect the exported file rather than assuming the filter survived. |
| Deliver to a print workflow | Ask the printer whether rasterized filtered areas are acceptable, what resolution they require, and how they verify vector requirements. | There is no universal resolution or all-vector preflight requirement established for every printer. |
When appearance matters more than all-vector output
The Inkscape guide names 96 dpi as a common screen value and recommends at least 300 dpi for print use of filtered objects. These settings affect the detail of the rasterized content, not whether it is vector. A higher dpi can improve the raster fallback but cannot make it scalable vector artwork. A 600 dpi setting may suit some workflows, but it is not a universal requirement.
When all-vector output matters more than the original effect
Turning off the raster fallback is only part of the job. If the exporter cannot express the filter as PDF vector operations, the visual effect may be lost or altered. Rebuild it with supported vector elements and check the PDF at high zoom; also confirm any recipient’s own preflight rules.
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Typography is a separate compatibility issue from filter rasterization. Inkscape documents embedding fonts when licensing permits, which can help preserve searchable text. For decorative lettering, converting text to paths avoids dependence on the recipient having the same font, but the lettering is no longer editable as text.
CairoSVG’s documentation says its font handling is limited and uses installed system fonts rather than CSS @font-face references. If that is your exporter, ensure the needed fonts are installed in its execution environment and do not assume advanced font features or CSS font references will be honored.
How should I preserve the file for future edits?
Keep the editable SVG as the source of truth and treat the PDF as a delivery copy. The Inkscape Beginners’ Guide advises keeping the SVG because PDF supports a different set of features and data may be lost in conversion. Save a new PDF after any changes to effects, text, or export settings, then inspect the version intended for delivery.
Before sending the file, confirm with the recipient whether filtered raster areas are acceptable, what resolution is required for the intended output, and whether they prefer embedded fonts or outlined lettering. Those specifications depend on the recipient’s workflow.
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