Is my image uploaded to make the PDF?

No. The PDF file is assembled byte-by-byte in your browser from the image you provide. It is never sent to any server.

How is the PDF built without a library?

The image is drawn to a canvas and exported as JPEG bytes, then embedded as a DCTDecode image object inside a minimal, spec-valid PDF (catalog, page, content stream and image XObject). The page is sized to the image at your chosen DPI.

Why is the output a JPEG inside the PDF?

JPEG (DCTDecode) is natively supported by the PDF format, keeps the file small, and works in every PDF reader. Transparent areas are flattened onto white because JPEG has no alpha channel.

Image to PDF

Turn a JPG, PNG or WebP into a single-page PDF — no upload.

Convert an image to PDF, privately

Wrap a photo, scan or screenshot into a single-page PDF that fits the image exactly. Choose the resolution (72, 150 or 300 DPI) so the page is sized correctly for screen or print, and set the JPEG quality.

The PDF is built entirely in your browser — the image is exported from a <canvas> and embedded directly into a minimal, valid PDF — so your file is never uploaded.