How to generate jpg thumbnail previews of pdf pages
- Step 1Upload the PDF — Drop the document into the PDF to JPG converter.
- Step 2Set DPI to 72 or 96 — Low DPI produces small, web-fast thumbnail images.
- Step 3Select cover page or all pages — For a single cover thumbnail, select page 1 only.
- Step 4Download the thumbnail JPGs — Use them in your website or document gallery.
Frequently asked questions
What dimensions will a 72 DPI thumbnail have?+
For an A4 PDF at 72 DPI, the thumbnail will be approximately 595 × 842 pixels — suitable for web display.
Should I use JPG or PNG for document thumbnails?+
JPG is best for photo-heavy PDFs (smaller file size); PNG is better for text-heavy or diagram-based PDFs (sharper edges).
Can I generate thumbnails for all pages in a large PDF?+
Yes — all pages are exported as individual JPGs. For large PDFs, Pro removes the size limit.
Privacy first
All PDF processing runs locally in your browser using PDF-lib and pdf.js. No file is ever uploaded — only metadata counters are saved for signed-in dashboard stats.