OxiPNG vs OptiPNG

OxiPNG is a modern Rust rewrite offering multithreaded speed, while OptiPNG is the older, single-threaded original.

Multithreading and Modern Implementation

OxiPNG was written in Rust with parallelism built in, letting it evaluate multiple compression strategies across CPU cores simultaneously, while OptiPNG's older single-threaded C implementation processes those same strategies sequentially and therefore takes considerably longer.

OxiPNG is written in Rust with multithreaded parallelism built in
It evaluates compression strategies across CPU cores simultaneously
OptiPNG's single-threaded implementation processes them sequentially

Comparable Output, Different Speed

Both tools are fully lossless and produce broadly comparable compression results, so the practical difference for most users comes down to how long a batch takes to process, where OxiPNG's parallelism gives it a substantial advantage on multi-core machines.

Both are fully lossless with broadly comparable compression results
The practical difference is processing time, not output quality
OxiPNG's parallelism gives a substantial edge on multi-core machines

Frequently Asked Questions

Does OxiPNG compress better than OptiPNG?

Compression results are broadly comparable since both are lossless — the meaningful difference is that OxiPNG is substantially faster thanks to multithreading.

Are both tools completely lossless?

Yes, both only reorganize and recompress the existing image data, so decoded pixels remain byte-identical to the original file.

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