OrbConvert converts your image files online. Amongst many others, we support PNG, JPG, JPEG, WEBP, GIF, SVG and TIFF. You can use the options to control image resolution, quality and file size.
From
Portable Network Graphic
Keeps every pixel, so nothing is lost when you save or re-save it — the safest choice for screenshots, logos and sharp-edged graphics. Photos stored as PNG are usually much larger than the same photo as JPG.
All PNG conversionsTo
Portable PixMap
One of the Netpbm family: the simplest possible way to store a full-colour image, with no compression at all. Files are large, and it carries no transparency.
All PPM conversions