ImageOptim is a free app that makes images take up less disk space and load faster, without sacrificing quality.
Best Zopfli Alternatives ranked by AI · updated Aug 2026
✅ Update queued — the AI is re-ranking this list. The page will refresh shortly.
This page is already up to date.
Zopfli is a compression algorithm and command-line implementation that creates highly compressed DEFLATE streams for formats such as PNG, gzip, and ZIP. It is for developers who prioritize final file size over compression speed and can tolerate heavier processing.
Top 6 Zopfli 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
Oxipng
Joshua Hernand
Oxipng is a multithreaded lossless PNG optimizer written in Rust. It targets developers and build pipelines that need fast, deterministic PNG reduction...
Pros
- Usually faster than ECT for PNG-only batch processing
- Multithreading improves throughput on modern CPUs
- Rust implementation offers a compact, actively maintained toolchain
Cons
- Handles PNG rather than ECT's broader image-format coverage
- Requires command-line familiarity
- Does not provide lossy compression for maximum size reductions
How good are these alternatives?
Your feedback helps us improve the AI rankings.
✅ Thanks for your feedback!
Know a better alternative? 🙌
Suggest a product and our AI will verify it's a real alternative to Zopfli before adding it to the list.