Image to PDF Converter - JPG & PNG to PDF Online

What Image to PDF Does

A PDF is a page description: it defines a canvas of a given physical size and places content onto it at given coordinates. This tool builds that description around your images. For each file it creates a page, works out where the image should sit on it, and embeds the image data inside the document. All the geometry is calculated in millimetres, which is why the margin options are stated in millimetres rather than pixels — a PDF page has a real physical size, and 20 mm is 20 mm whether the image is 800 pixels wide or 8000. With A4, Letter, or Legal selected, the page is fixed and the image is scaled to fit inside the area left over after the margins, keeping its aspect ratio and centred on both axes. Nothing is stretched and nothing is cropped; a square photo on a portrait A4 page simply leaves space above and below. With Fit to image selected the page instead takes the shape of the image, converted at 96 DPI, so a screenshot becomes a page with no whitespace at all. Two details matter for the result. First, transparency: JPEG has no alpha channel and the image stream a PDF embeds carries no soft mask, so a transparent PNG or WebP would come out with black patches. Transparent images are therefore flattened onto white first, which is what almost everyone expects a document page to look like. Second, orientation: photos from phones and cameras are frequently stored rotated with an Exif Orientation tag telling viewers to turn them. PDF ignores that tag entirely. Files carrying one are re-encoded with the rotation physically applied, so the page is the right way up; files that are already upright are embedded byte for byte with no re-encoding and no quality loss at all. The whole process runs in your browser using its own image decoder, so your photos, scans, and documents never leave the device.