Vector vs Raster PDF Quality in AutoCAD
AutoCAD PDFs can contain vector drawing data and raster image data. Vector quality controls vectors and gradients, while raster image quality controls raster content; raster quality cannot exceed vector quality.
Start here — what you are going to do
Your goal: Choose PDF quality settings based on the type of content in the drawing.
Where to start: Identify whether the sheet is mostly CAD vectors, raster images, or a mix.
Beginner rule: Do not increase every DPI value to the maximum. Test the content that actually needs more detail.
Step by step — follow this in AutoCAD
Step 1 — Choose a representative sheet
Where: Project Layout.
Do this: Include typical lines, hatches and any raster images.
Check: The test represents real output.
Step 2 — Open PDF options
Where: PDF preset Properties / Export to PDF Options.
Do this: Locate Vector Quality and Raster Image Quality.
Check: Both values are visible.
Step 3 — Read the baseline
Where: PDF quality settings.
Do this: Record current vector/raster DPI.
Check: You can compare changes.
Step 4 — Create baseline PDF
Where: Plot/Export.
Do this: Save the sheet with current settings.
Check: Baseline file size/detail are known.
Step 5 — Change one quality setting
Where: Test PC3/options.
Do this: Increase only vector or raster quality based on the observed issue.
Check: The experiment is controlled.
Step 6 — Compare PDFs
Where: PDF viewer / file properties.
Do this: Inspect fine lines, raster images, gradients, file size and print performance.
Check: You know whether the higher setting adds value.
Beginner example
A site plan with thousands of vector contours may need higher vector quality. A sheet with aerial imagery may be limited by raster image quality. Raising raster DPI will not improve pure CAD vector line geometry.
Understand what AutoCAD is doing
Vectors stay mathematically defined
Most 2D CAD lines can remain crisp at many zoom levels.
Raster content has pixel resolution
Images and rasterized views depend on raster quality.
Some views become raster
Autodesk notes 3D visual styles are converted to raster images in PDF output.
Useful next guides: AutoCAD PDF Resolution Settings Explained · AutoCAD PDF (High Quality Print) Preset Explained · AutoCAD PDF Is Blurry or Pixelated · AutoCAD PDF File Is Too Large: How to Reduce It · AutoCAD PDF Is Slow to Open or Print: What to Check
Common problems and what to check first
| What you see | What may be causing it | Check this first |
|---|---|---|
| Lines look jagged | Vector quality too low or content rasterized | Check vector quality/visual style. |
| Images blurry | Raster quality/source image low | Check both. |
| PDF huge | Quality higher than useful | Reduce after comparison. |
| Printing slow | Very high resolution/dense data | Balance quality and performance. |
When you need a more repeatable workflow
Build quality tests around linework-heavy, raster-heavy and rasterized/3D sheets, and record both visual improvement and performance.
Official Autodesk references
AutoCAD labels and available media can vary by release, driver and output device. These Autodesk pages document the core workflow used in this guide.
Frequently asked questions
Can raster quality exceed vector quality?
No.
Do normal CAD lines need raster DPI?
Pure vectors are governed by vector quality.
What happens to 3D visual styles?
They are rasterized in PDF output.
Explore more in CAD PDF & Publishing Guide.