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
AV1 Image File Format
Compresses harder than anything else we support, so it wins whenever file size matters most. Support is still patchy, so keep a copy in another format.
All AVIF conversions