losslessly

5.9easy start · #74 of 84
in Image Compression Software

Runs on Linux, Mac, Windows.

losslessly is ranked #74 of 84 in image compression software on The Geeks Club. It runs on Linux, macOS, Windows.

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Purpose: losslessly is a command-line image optimizer that recompresses PNG, JPEG, GIF and WebP files and minifies SVG markup.
Image integrity: PNG, JPEG and WebP output decodes to the same pixels as the input, while GIF output preserves rendered frames and timing.
Formats: It searches directories recursively for PNG, APNG, JPEG, GIF, WebP and SVG files.
Metadata: EXIF, ICC profiles, XMP and comments are kept unless the --strip option is used.
Automation: The --check option writes nothing and exits with code 1 if any file could shrink, enabling CI checks.
Installation: Prebuilt binaries are offered for macOS and Linux on x86_64 and arm64, and Windows on x86_64.
Source install: Source installation requires a Rust toolchain and C compiler.
Notable limits: It does not do lossy compression or format conversion, and AVIF and JPEG XL are not on its roadmap.
License: The repository is licensed under the MIT license.
Data handling: The README describes processing local files in place and replacing a file only when the result is smaller.
Maker: The GitHub profile identifies the maker as Kamil Doroszewicz and lists Poland as the location.

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