PDF to JPG

150 DPI is the right default for a PDF-to-JPG export, and it is what the tool preselects. The chip you pick becomes a scale factor against the PDF's native 72-point grid, so 72 reproduces the page at roughly its on-screen size, 150 doubles each dimension and 300 quadruples the pixel area — an A4 page goes from about 595×842 pixels to about 2480×3508. Choose 72 for a quick preview or a chat attachment, 150 for slides and web pages, and 300 when the JPG will be printed or cropped into. Higher DPI costs memory as well as disk space: each page is rendered into a full-size canvas before it is encoded, so a 300 DPI run on a long document is where an older phone is most likely to run out of room.

JPEG has no alpha channel, so PDF to JPG paints the canvas white before rendering each page. Without that fill, any region the PDF never paints — the margin of a page with no background box, a logo cut out on transparency — would encode as black rather than as nothing, because that is how an empty canvas reads to a JPEG encoder. The white fill matches what the page looks like in a normal PDF viewer, and it is not configurable. If you need the transparency preserved, use PDF to PNG instead: that exporter deliberately skips the white fill and PNG carries the alpha channel through. PDF to WebP also skips the fill if you want a smaller transparent file.

Yes — PDF to JPG saves one JPEG per page and there is no option to bundle them into a zip. Files are named after your PDF with a zero-padded page suffix, so report.pdf becomes report-page-01.jpg through report-page-12.jpg, while a single-page document is saved as report.jpg with no suffix at all. The downloads fire one after another with a short pause between them, because browsers throttle rapid sequential saves. Chrome and Edge usually show an "Allow multiple downloads" prompt on the first multi-page run — accept it, or only the first image lands. If your browser silently blocked the rest, allow multiple downloads for the site in its permission settings, press Reset, and convert the document again.

The Quality slider sets the JPEG compression level the browser applies when it encodes each rendered page, from 50 % up to 100 %, starting at 90 %. It has no effect on resolution — that is what the DPI chips control — only on how aggressively the encoder discards detail. At 90 % text stays crisp and the files are a fraction of a lossless export. Below roughly 70 % you start seeing ringing around sharp black type and blocking in flat colour fills, which is exactly the content most PDF pages are made of; photographs tolerate low settings far better than text does. If you want no loss at all, no slider position gets you there — JPEG is lossy by design, so switch to PDF to PNG.

PDF to JPG is free with no account, no export cap and no watermark burned into the images, and your PDF is never sent anywhere. The page loads pdf.js into your browser, reads the file you picked through the standard File API, draws each page onto a canvas element and asks that canvas to hand back JPEG bytes — every one of those steps happens on your own device. You can confirm it yourself: open DevTools, watch the Network tab and press Convert & download; you will see the pdf.js worker chunk fetched on the first run and nothing at all carrying your document. Because no server does the rendering, there is no per-conversion cost to recover and so no paid tier, no queue and no file-size gate.

"Could not convert — make sure the PDF is not encrypted" means pdf.js refused to open the document, and a password is the usual reason. A PDF with a user password cannot be rendered until it is decrypted, so run it through Remove PDF password first and convert the unlocked copy. The other common cause is a file that is not really a PDF: some scanners and phone apps save a JPEG or TIFF with a .pdf extension, and those fail the moment the header is read. A truncated download produces the same message. If the page strip loaded thumbnails but conversion still fails, the document is probably damaged part-way through — re-export it from the source application.