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 GrayMap
The Netpbm grey-scale format — one channel, uncompressed. Colour information is discarded, not converted.
All PGM conversionsTo
Graphics Interchange Format
Holds only 256 colours per frame, which is why photos look banded in it. It survives because it animates and loops anywhere without a plugin.
All GIF conversions