PDF ↔ JPG

JPG makes photographs and scanned pages small. It cannot store transparency and every save is lossy, so it suits pages that are mostly pictures.

How to turn PDF pages into JPG images

1. Add the PDF. Leave the Pages box empty for every page, or type a selection such as 1-3,5.
2. Choose the resolution (72, 144 or 216 DPI) and the quality. Quality starts at 90%.
3. Press Convert and download pages.zip with one JPG per page.
4. To combine photos into a PDF, switch the operation to Image → PDF, add the photos in the order you want, and choose A4 or Letter.

What the settings do

• Quality runs from 10% to 100% in steps of 10. Lower values give smaller files and visible blocks around text and thin lines.
• Resolution and quality are separate: resolution sets the size in pixels, quality only sets how strongly JPG compresses those pixels.
• JPG cannot store transparency, so use PNG if you need to keep it.

Measured example

The same generated 3-page A4 PDF at 144 DPI and 90% quality gave three JPGs of 39,532, 40,953 and 42,036 bytes. The matching PNGs were about 60 KB each, so on this simple test page JPG was about a third smaller. Your pages will differ; compare the sizes on your own file.

Limits

• Each save is lossy. Do not convert the same JPG again and again; go back to the PDF instead.
• Small text can look rough at low quality or 72 DPI. If the edges look soft, raise the DPI or use PNG.
• Rendering happens in your browser, so a long PDF at a high DPI can be slow.

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