Forms, job applications and school portals often ask for "a single PDF". If your documents are photos or screenshots, you need to turn the images into a PDF first. The method is simple, but a few choices decide whether the result is sharp, correctly sized and small enough to upload.

What actually goes inside the PDF

A PDF made from pictures is a set of pages, each holding one image. The PDF does not make the picture any better. If a photo is blurry, the PDF will be blurry too. What you control is how large each page is, how the image is placed on it, and how much the image is compressed.

Why phone photos make huge PDFs

A modern phone photo is often 4,000 pixels or more on its longest side and several megabytes in size. A PDF that holds ten of them can easily reach 30 MB or more, which many upload forms refuse. A page that is read on a screen or printed at A4 does not need that many pixels. At A4 size (about 8.3 by 11.7 inches), 2,000 pixels on the long side is already about 170 pixels per inch, which looks clean on screen and acceptable in print.

Choosing the page size

  • Same as the image. Each page is exactly the shape of its picture. This suits screenshots and scans that you want to keep whole.
  • A4. The standard paper size in most of the world. Choose it if the PDF will be printed or if the form asks for A4.
  • US Letter. The standard in the United States and Canada.

With A4 or Letter, the image is scaled to fit inside the page and centred, so nothing is cut off. The unused space around a picture that is not the same shape as the page stays white.

Orientation and margins

Landscape pictures look best on landscape pages. The "Auto" setting does this for you, page by page. A margin keeps the picture away from the page edge, which matters if you will print on a home printer that cannot print right to the border. A small margin is a good default. Use none for full-bleed screenshots.

Keeping the file small

The biggest lever is image resolution and JPEG quality. A tool that lets you choose a quality level can reduce each image before it is placed in the PDF. As a rough guide, a smaller setting that limits the long side to about 1,200 pixels is plenty for reading on screen, and a medium setting of about 2,000 pixels is a good balance for printing. Removing pages you do not need helps too.

What a PDF made from images cannot do

Because every page is a picture, you cannot select or search the text on it. Turning pictures of text into real text needs OCR (optical character recognition), which is a separate process. Also, transparent areas of a PNG become white when the image is stored as JPEG inside the PDF.

Try it

Add your images, drag them into order with the arrows, choose a page size and quality, and download the PDF. The files are processed in your browser and are not uploaded. If a photo is sideways or too large, you can first fix it with the Image Crop and Rotate tool or shrink it with the Image Compressor.