How the image to PDF converter works
Choose your pictures with the button or drag them onto the drop area. They appear in a list in the order they will be placed in the document, and the arrow buttons move a picture up or down. When you press Create PDF, each image is placed on its own page and the finished file is offered as a download. The whole process runs in your browser using pdf-lib, an open-source PDF library that this site serves from its own domain, so your photos are not uploaded anywhere. That matters for scans of passports, receipts, contracts and other personal documents.
Page size, orientation and margins
With a standard page size such as A4 or US Letter, every image is scaled to fit inside the margins while keeping its proportions, and it is centred on the page. Automatic orientation turns a page to landscape when the picture is wider than it is tall, which makes the most of the space for screenshots and wide photos. If you choose Same as image, each page is made exactly the size of its picture (at 96 pixels per inch), which is useful when the PDF will only be read on screen. A small margin looks tidier when the document is printed, while no margin is best for full-bleed scans.
Supported formats and photo rotation
JPEG images are copied into the PDF unchanged, so there is no extra loss of quality. PNG images keep their sharp edges and transparency. Other formats your browser can open, such as WebP, GIF and BMP, are converted to PNG first. Phone cameras often save photos sideways and record the correct rotation in a small EXIF tag. Browsers respect that tag but PDF viewers do not, so the converter reads it and rotates the picture for you. Your pages come out upright, the way you saw them on your phone.
Tips for smaller files
A PDF made from photos is roughly as large as the photos themselves. If you need to email or upload the result and the file is too big, shrink the pictures first with the image compressor or image resizer on this site, then convert them. Around 1,600 pixels on the long edge is plenty for a readable A4 page. For text documents, a clear, well-lit photo taken straight on gives a much more legible result than a dark or angled one.
Limits
Because everything happens in your device's memory, very large batches of high-resolution photos can be slow on older phones. If that happens, convert the images in smaller groups and join the results with the merge PDF tool.