Which quality to choose
The quality setting decides how many pixels each page gets. A PDF page is measured in inches, so the same page comes out bigger at a higher dpi (dots per inch):
| Setting | A4 page becomes | Good for |
|---|---|---|
| Small (96 dpi) | about 794 × 1,123 pixels | Email, chat apps, quick previews |
| Standard (150 dpi) | about 1,240 × 1,754 pixels | Reading on a phone or laptop, uploading to most forms |
| High (300 dpi) | about 2,480 × 3,508 pixels | Printing, zooming into small text |
The line under the quality box shows the size for your first page, so you can check before converting. Very large pages, such as posters and engineering drawings, are made slightly smaller if they would go past what browsers can draw, and the tool tells you when that happens.
JPG or PNG?
JPG files are small, which makes them the usual choice for photos, scans and anything you will send or upload. Text edges get a little soft because JPG saves space by dropping fine detail. If the page is mostly text, diagrams or a screenshot and you want razor-sharp edges, use PDF to PNG instead; the files are bigger but nothing is lost.
Names, order and ZIP files
Images are named after the PDF with the page number padded, such as report-page-03.jpg, so they stay in order in any folder. A one-page PDF keeps its own name. When you convert more than one page, “Download all (ZIP)” saves every image in one file, which is easier on phones than many separate downloads.
Locked PDFs
If a PDF needs a password to open, it can’t be read until it is unlocked. Use Remove PDF Password with the password you were given, then convert the unlocked copy. Your file is opened and processed in your browser, so it is never uploaded to a server.