PDF (Portable Document Format) is a fixed-layout document standard created by Adobe in 1993 and standardized as ISO 32000. Because a PDF renders identically on every device, operating system, and printer, it is the default format for invoices, forms, reports, and anything meant to be shared or printed.
PDF is great for sharing and printing because the layout never shifts, but it is not an image editing format — content is hard to change once the file is created. Our tools can both generate PDFs from your images (each image becomes a one-page PDF, or merge several into one multi-page PDF) and read existing PDFs back into images via pdf-to-jpg and pdf-to-png.