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 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 conversionsTo
Silicon Graphics Image
The native image format of Silicon Graphics workstations, still used in visual-effects pipelines. It carries transparency and holds 8 or 16 bits per channel.
All SGI conversions