PDF stands for Portable Document Format. It's a versatile file format created by Adobe that gives people an easy, reliable way to present and exchange documents
PNGs are a form of raster file. That means they’re built using a fixed number of color pixels, rather than the mathematical algorithms used in vector files. PNG is very commonly seen image format widely used everywhere.
You can select and upload up to dozens of PNG images each time, please use drag and drop to sort your pictures before converting them.