Convert PDF
Pages rendered as JPEG or PNG, and photographs packed into one document at A4 or US Letter size.
Two directions, three pages
PDF to JPG and PDF to PNG render pages into pictures; JPG to PDF does the opposite and wraps a set of photographs in a document. The choice between the two renderers is a choice about loss: JPEG compresses and loses detail, PNG does not. The choice of resolution decides how much detail there is to lose, and all three pages expose that as an explicit setting instead of a hidden default.
PDF to JPG
Five resolution steps are offered, from a 1x render at 96 DPI up to 4x, and JPG quality has three levels of 60, 80 and 92. The output is one image per page, bundled as a ZIP archive, so the button reads Convert and Download ZIP. A 2x render at quality 80 covers most screen uses; a page of small print is better at 3x or 4x with quality 92, at the cost of a much larger archive.
PDF to PNG
The same five resolution steps appear without a quality control, because PNG keeps what it is given. That makes this page the correct one for a chart, a diagram, a screenshot or any page where text edges matter. The trade is weight: a photographic page saved as PNG can be several times heavier than its JPEG equivalent, and the archive grows with every page in the document.
JPG to PDF
Page size offers Fit to each image, A4 portrait with margin, and US Letter with margin. Margin is specified in points and starts at 24. The picker accepts several JPEGs and Create PDF and Download merges them in the order chosen, so a set of photographed receipts becomes one attachment. Fit to each image keeps a page exactly as large as its picture, which is the right choice when the images already have the proportions of a document.
What these pages will not do
No page in this group recognises text inside a scan, so a rendered page is a picture of words rather than selectable text. Nothing here merges two PDFs, removes pages or changes page order; those jobs belong to Organize PDF. Rendering also depends on what the browser can draw, so a very long document takes longer and produces a correspondingly bigger archive.
Choosing a resolution
A 1x render at 96 DPI matches what a screen shows and keeps the archive small. A 2x render doubles the pixels on each side and is the usual answer for reading on a tablet. The 3x and 4x steps are for print or for a page of small type, and the rule is to render at the size the image will actually be viewed at, because every step up multiplies both the archive and the time the tab spends drawing pages.