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 GrayMap
The Netpbm grey-scale format — one channel, uncompressed. Colour information is discarded, not converted.
All PGM conversions