Guides

Practical answers to the questions that come up when turning pictures into PDFs and back.

• DPI explained: choosing a resolution for PDF to imageHow DPI turns a PDF page into pixels, and which number to pick.
• How to scan documents to PDF with a phonePhotograph paper, get a tidy multi-page PDF. Lighting, framing and file size.
• How to convert an iPhone photo to PDFThe Print trick, the Files app, or a browser converter for many photos at once.