JPG to PDF

How the conversion works

Each image becomes one page of the PDF, in the order shown in the list. The PDF is put together by your browser, so the images are never uploaded.

• JPG photos go into the PDF without being re-compressed. The compressed picture data is copied as it is, so there is no extra quality loss, and the PDF is roughly the size of the images added together.
• PNG images, such as screenshots, are stored losslessly. Transparent areas show as white, the colour of the paper.
• WebP images cannot be placed in a PDF directly, so they are converted first: to PNG when they have transparent areas or were saved losslessly, otherwise to JPG at 92% quality, which can soften very fine detail slightly.

Page size, orientation and margins

With A4 or US Letter, every image is centred and scaled to fit inside the margins. Nothing is cropped or stretched. Auto orientation gives landscape images a landscape page and portrait images a portrait page; choose Portrait or Landscape to use one orientation for every page. The margin is 10 mm (small) or 25 mm (large) on each side.

Fit page to image makes each page the shape of its image, so there are no white borders unless you add a margin. The page size comes from the resolution stored in the file, so a 300 DPI scan of an A4 sheet becomes an A4-sized page. When a file does not record a resolution, 96 pixels per inch is used: a 1920 × 1080 screenshot becomes a 20 × 11.25 inch page. PDF readers scale pages to fit the screen, and print dialogs can scale them to the paper.

Turn off Enlarge small images to keep small pictures, such as a logo or a signature, at their own printed size instead of stretching them across the page, where they could look blurred.

Rotation and phone photos

Phones often save photos sideways, together with a note (the EXIF orientation) that tells apps how to turn them. The converter follows that note, so photos appear the right way up, just as in the preview. The rotate button turns a page by a further 90 degrees clockwise. Rotation is done by the PDF's drawing instructions, so the image itself is not re-encoded.

Privacy and metadata

Camera details stored inside JPG files, such as the camera model, the date and the GPS location, are removed before the picture goes into the PDF, together with extra data some phones attach (depth maps and HDR gain maps). Colour profiles of RGB and greyscale images are kept, so photos taken in wide-colour modes such as Display P3 on recent iPhones keep their colours.