Which format to pick
- JPG for scans, photos and anything you’ll email — smallest files.
- PNG for text-heavy pages, slides and diagrams — lossless, crisp edges.
- WebP for putting pages on a website — typically smaller than JPG at the same quality, supported by every current browser.
Page ranges
Leave Pages empty for everything. Otherwise use commas and dashes: 1-3, 8, 10- means pages 1, 2, 3, 8 and 10 to the end. Unselected pages are dimmed in the preview strip.
Questions
Is my PDF uploaded?
No. pdf.js, the PDF engine used by Firefox, runs inside this page and draws each page on a canvas in your browser. The file never leaves your device.
What DPI should I choose?
150 DPI for sharing and reading on screens, 200 for crisp text, 300 for printing at actual size. 600 is for archiving and is capped by the browser’s canvas limit on large pages.
Is there a size limit?
There is no upload limit because nothing is uploaded. Each rendered page is capped at 16 megapixels (the iPhone Safari canvas limit) — an A4 page at 300 DPI is 8.7 MP, so it fits; at 600 DPI the page is automatically rendered at about 406 DPI and the result tells you so.
Can I get the original photos out instead of page pictures?
Yes — use Extract Images from PDF. It pulls each embedded picture at its stored resolution rather than drawing the whole page.