ImageOptim

ImageOptim is a GUI for lossless image optimization tools: Zopfli, PNGOUT, OxiPNG, AdvPNG, PNGCrush, JPEGOptim, Jpegtran, Guetzli, Gifsicle, SVGO, svgcleaner and MozJPEG.

Changelog

v1.9.5 (2025-03-11)

Apple Silicon Support

• Universal binary support for Apple Silicon (arm64) and Intel (x86_64) processors
• Release builds produce a single app that runs natively on both architectures

Dependency Consolidation

• All dependency files unified locally for easy compilation
• Added libzopfli.a and libdeflate.a for advpng
• Pre-built binaries included in submodules

Release Assets

• DMG: ImageOptim-1.9.5.dmg for distribution
• tar.bz2: ImageOptim1.9.5.tar.bz2 for Sparkle updates

v1.9.5 (2025-03-11)

Version bump – build and release tooling updates.

v1.9.4 (2025-03-11)

Apple Silicon (arm64) Support

• Universal binary support for Apple Silicon (arm64) and Intel (x86_64) processors
• Release builds produce a single app that runs natively on both architectures

Build System

• imageoptim/release.xcconfig: Add ARCHS = arm64 x86_64 for universal binaries
• jpegoptim/jpeg-6b/jpeg.xcodeproj: Update VALID_ARCHS and ARCHS from legacy i386 ppc x86_64 to arm64 x86_64
• advpng: Add libzopfli.a and libdeflate.a linking; run ./configure && make in advpng for dependencies
• One-step build script: ./scripts/build-dmg.sh builds and creates DMG

Release Assets

• DMG: ImageOptim-1.9.5.dmg for distribution
• tar.bz2: ImageOptim1.9.5.tar.bz2 for Sparkle updates

Building

Requires:

• Xcode
• Rust installed via rustup (not Homebrew).

git clone --recursive https://imageoptim.com ImageOptim
cd ImageOptim

To get started, open imageoptim/ImageOptim.xcodeproj. It will automatically download and build all subprojects when run in Xcode.

In case of build errors, these sometimes help:

git submodule update --init

cd gifsicle # or pngquant
make clean
make

Testing

Run product tests:

# Run BackendTests unit tests (PNG/JPEG/GIF/SVG optimization)
./scripts/run-tests.sh --quick

# Run full test suite
./scripts/run-tests.sh --all

# Integration test (requires build first)
./scripts/integration-test.sh

Or in Xcode: Product → Test (⌘U)

Release

One-step build and DMG creation:

./scripts/build-dmg.sh

Full release (build, tag, push to GitHub, create release with DMG + tar.bz2):

# Requires: gh CLI (brew install gh), authenticated with GitHub
./scripts/release-github.sh [VERSION]

Outputs are saved to release-<VERSION>/ locally and uploaded as GitHub release assets.