PDF to JPG Quality: DPI, Resolution and File Size
A sharper JPG requires more pixels and usually a larger file, so the best setting depends on where the image will be used.
Resolution comes from rendering scale
PDF pages can contain vector text and graphics that stay sharp at many zoom levels. Converting to JPG turns the page into a fixed pixel image. A higher render scale captures more detail but uses more memory and storage.
JPG quality is separate from resolution
Resolution controls how many pixels are created. JPG quality controls how strongly those pixels are compressed. A high-resolution image at low quality can still look blocky, while a low-resolution image at maximum quality can still lack detail.
When to use PNG or WebP
PNG is useful for diagrams, screenshots and line art with sharp edges. WebP can provide a good balance for web publishing. JPG is broadly compatible and efficient for photographs and scanned pages.
Practical starting points
For ordinary screen viewing, start with a moderate scale and quality. Increase scale for small text, detailed forms or printing. Convert only the required page range to avoid unnecessary files.
- Check small text at 100%
- Use PNG for crisp line art
- Use JPG for scanned photographs
- Use WebP for modern web delivery
- Keep the source PDF