How to use the PDF to JPG converter
- Add the PDF.
- Choose a resolution and, if you like, a JPG quality. 150 DPI suits screens; 300 DPI suits printing.
- Under More settings, type page numbers if you only need some pages.
- Press Convert and save the images one by one or as a ZIP.
How big the images come out
PDF measures pages in points, 72 per inch, so the DPI setting decides the pixel size. An A4 page at 150 DPI is roughly 1240 × 1754 pixels; at 300 DPI each side doubles and the file is several times heavier.
Oversized sheets like posters or drawings are limited to about 40 megapixels per image, which keeps the export working on phones and in Safari.
When JPG is the right format
JPG works best for scanned pages and pages with photographs, where it keeps files small. Uploading a scanned certificate to a portal that wants an image is a typical case.
Pages that are mostly fine print or thin lines can pick up faint smudges around letters as JPG. Use PDF to PNG for those. Either way, transparent areas become white.
Only the pages you need
An upload form that wants “a photo of the first page of your passport copy” needs one image, not twenty. Type that page number under More settings and only it is rendered.
The quality slider runs from 30 to 100. The default of 88 is a good balance; lower it if a portal sets a tight size limit per image, and check the text is still readable.
Questions
How are the images named?
After the PDF with the page number added and padded with zeros, for example contract-page-03.jpg, so they sort in page order.
A page looks slightly different from Acrobat. Why?
Pages are drawn with pdf.js, the renderer used in Firefox. Unusual fonts or blend effects can occasionally look a little different.
Does it work on a locked PDF?
If the file only blocks printing or copying, yes. If it needs a password to open, remove it first with Unlock PDF.