Why PNG for documents
PNG is a lossless format: every pixel is stored exactly as it was drawn. That keeps thin lines, small print, charts, logos and table borders perfectly sharp, which is why PNG is the better choice for documents, diagrams and anything you will put into slides or a design. The price is size. A page of text at 150 dpi is often several times bigger as a PNG than as a JPG.
For photos and scanned pages, where a little softness doesn’t show, PDF to JPG gives much smaller files.
Choosing the quality
- Small (96 dpi) matches a normal screen and keeps files light. An A4 page is about 794 × 1,123 pixels.
- Standard (150 dpi) is sharp on phones and laptops and good for most uses, about 1,240 × 1,754 pixels for A4.
- High (300 dpi) is print quality, about 2,480 × 3,508 pixels for A4. Use it for printing or when you need to zoom into fine detail.
The note under the quality box shows the pixel size of your first page before you convert. Very large pages are reduced just enough for every browser to save them, and you’ll see a message if that happens.
Background and transparency
Pages are drawn on a white background, the way a PDF reader shows them, so text never ends up on a see-through or black background when you paste the image somewhere else.
Getting the images
Each image is named after the PDF and its page number, such as manual-page-12.png. Download them one by one, or press “Download all (ZIP)” to save every page in one file. Your file is opened and processed in your browser, so it is never uploaded to a server. If the PDF asks for a password, unlock it first with Remove PDF Password.