Why put pictures into a PDF
Photos of documents, screenshots and scans are easy to take but awkward to send: ten separate pictures arrive in random order, in different formats and sizes. A single PDF keeps every page in the right order, opens on almost every device and is accepted by email, offices and upload portals that do not take image files.
What happens when you convert
Each picture becomes one page. JPG photos are placed into the PDF as they are, without compressing them again; other formats such as PNG, WEBP, HEIC, TIFF, GIF, BMP, AVIF, SVG and ICO are opened by your browser first and then added in high quality, keeping transparency where the picture has it. Choose “Combine into one PDF” to make one document, or “One PDF per image” for separate files. With A4 or US Letter, each picture is centred with a small margin, and wide pictures get landscape pages automatically.
Which pictures work best
Sharp, well-lit pictures taken straight from above give clear pages. Screenshots and scans keep their full detail. Very large camera photos make large PDFs, so for upload forms with small limits it is better to use Image to PDF Under 100KB, which reduces the size for you.
Common problems and how to fix them
Pages are in the wrong order: drag the pictures in the list before converting — the list order is the page order. A page is sideways: rotate the picture with Rotate Image first, or rotate the PDF page later with Rotate PDF. The PDF is too big: run it through Compress PDF. An iPhone HEIC photo will not open elsewhere: this tool reads HEIC directly, so no extra conversion is needed.
Good habits
Crop away table edges and backgrounds before converting, name the PDF clearly, and check every page once before you send it.