ImageOptim

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

This project keeps the native AppKit/XIB workflow and currently targets macOS 13+ on Apple Silicon only (arm64). Intel Macs and older macOS releases are no longer supported by this build configuration.

Download

Prebuilt Apple Silicon builds are published on GitHub Releases:

• Download the latest ImageOptim build
• Browse all builds

Each build is for macOS 13+ on Apple Silicon (arm64). If the latest release does not include an app archive yet, build the app locally with the steps below.

Main window

The refreshed main window keeps the table-based optimization queue, with:

• Native toolbar actions for Add Files, Stop, Retry Failed, Optimize Again, Clear Done, and Settings.
• Queue totals for Total, Done, Running, Remaining, and Failed, plus determinate progress.
• Queue filters for All, Running, Done, and Failed.
• Task-state labels such as Queued, OxiPng, JpegOptim, Optimized, No change, and Failed.
• A drag-and-drop empty state, a clearer task table, and a selection details strip.

Building

Requires:

• macOS 13+ on an Apple Silicon Mac.
• Xcode with a macOS 13 SDK or newer.
• Rust installed via rustup (not Homebrew).
• Node at /opt/homebrew/bin/node for SVGO support.

git clone --recursive [email protected]:a-j-n/ImageOptimizer.git
cd ImageOptimizer

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

To build the Release app from the command line:

xcodebuild \
  -project imageoptim/ImageOptim.xcodeproj \
  -scheme ImageOptim \
  -configuration Release \
  ARCHS=arm64 \
  ONLY_ACTIVE_ARCH=NO \
  CODE_SIGNING_ALLOWED=NO \
  build

Release verification

Run the release verification script before shipping a build:

scripts/verify-release

It lints changed plist/strings files, validates ImageOptim.xib, builds Release for arm64, and checks the final .app plus bundled helpers with lipo -archs.

Troubleshooting

In case of build errors, these sometimes help:

git submodule update --init

cd gifsicle # or pngquant
make clean
make

Some helper projects generate local build artifacts inside submodules. The repository ignores those files so normal helper builds do not dirty the main working tree.