PNG or JPG for PDF pages?
Most PDF pages are text on a white background. JPG struggles with that kind of image: it smears faint grey blocks around letters and thin lines, visible as soon as you zoom in. PNG stores the page exactly, so text stays black and edges stay clean. For a page of text, a PNG is often no bigger than a good-quality JPG, because large white areas compress very well.
If the pages are mostly photographs, such as a brochure or a scanned photo album, PDF to JPG will give much smaller files.
Resolution
The DPI slider runs from 96 to 200, starting at 144. At 144 DPI an A4 page is 1191 × 1684 pixels and a US Letter page is 1224 × 1584, enough to read comfortably on a laptop or paste into slides. Use 200 when someone needs to zoom into a detailed diagram or small print.
Things to know
- Pages are rendered on white, as a PDF viewer shows them. The PNG has no transparent background.
- Up to 100 consecutive pages per run. Files are named by their page number in the original PDF, so later batches sort correctly alongside earlier ones.
- Text in the PNG is part of the picture. It can’t be selected or searched.
Questions
Is the PDF uploaded?
No. Pages are drawn by your browser, so confidential documents never leave your device.
Some pages come out blank.
That usually means the PDF is encrypted or uses a font that isn’t embedded. Open it in your PDF reader, use Print › Save as PDF to make a clean copy, and convert that.