ImageOptim is a free app that makes images take up less disk space and load faster, without sacrificing quality.
Best Oxipng Alternatives ranked by AI · updated Aug 2026
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Oxipng is a multithreaded lossless PNG optimizer written in Rust. It targets developers and build pipelines that need fast, deterministic PNG reduction with command-line and library interfaces.
Top 6 Oxipng alternatives
FileOptimizer is a lossless file size optimizer supporting various formats including audio, video, images, documents, etc.
pngquant is a command-line utility and a library for lossy compression of PNG images.
OptiPNG is a PNG optimizer that recompresses image files to a smaller size, without losing any image data.
Efficient Compression Tool is a cross-platform command-line utility for losslessly optimizing PNG, JPEG, GIF, and WebP images. It is aimed at developers...
Pros
- Supports several image formats in one command-line tool
- Lossless optimization preserves source image quality
- Can outperform simpler optimizers through exhaustive compression methods
Cons
- Slower than faster PNG-only optimizers on large batches
- More difficult to use than GUI tools such as ImageOptim
- Limited workflow integration compared with build-plugin ecosystems
6
Google
Zopfli
Zopfli is a compression algorithm and command-line implementation that creates highly compressed DEFLATE streams for formats such as PNG, gzip, and ZIP....
Pros
- Can achieve smaller DEFLATE-based files than conventional compressors
- Useful across PNG, gzip, and ZIP-related workflows
- Mature open-source implementation with broad ecosystem support
Cons
- Much slower than everyday compressors and many ECT workflows
- Does not optimize image pixels or metadata by itself
- Requires another tool for complete PNG optimization
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