xtopng is a general-purpose image translator based on SDL, SDL_image, libpng, and png-saving code written by Philip D. Bober. It can read many different image formats and convert them to png. Supported input file types are anything your installation of SDL_image supports. Commandline syntax is simple:

xtopng [-flag] [-flag] file1 [file2] [...]

Currently supported flags:

• -[0-9]: Compression level. -0 disables compression, -9 uses maximum compression, in-between is in-between. If this flag is not specified, it uses zlib's default compression level.
• -r: Remove input files after conversion. This dangerous flag is obviously OFF by default. I've tried to be paranoid - it will not remove files it has not converted, and it will not remove read-only files - but I might have missed something, so play safe.

This code, mine and Philip's, is under the zlib license.

Update -- xtopng has been ported with little difficulty to Macintosh OSX™. The OSX version requires libpng, which I've made a package available for TOTALLY as-is. I've also replaced the automake crap in the source tarball with small custom makefiles. Rejoice as tarball sizes drop from 500K to 4K in xtopng-0.3.

Update -- I have ported xtopng to Windows® as a proof-of-principle of SDL's portability. Included in 0.2 is a source syntax fix that applies to both Linux® and Windows®.

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Send comments, patches, ports, etc. to Tyler Montbriand