A macOS Quick Action that lets you resize images directly from Finder's right-click menu. The resized image is saved alongside the original with dimensions in the filename (e.g., photo_500x333.jpg).
- Right-click any image in Finder → Quick Actions → Resize Image
- Enter max width, max height, or both
- Proportional resizing (aspect ratio preserved)
- Original file is never modified
- Resized copy saved next to the original with dimensions in the filename
- Uses macOS built-in
sips— no dependencies required - Native two-field resize dialog (compiled from Swift at install time)
- Fully self-contained — the install script embeds everything into the workflow
- macOS (tested on Tahoe 26)
- Xcode Command Line Tools (
xcode-select --install)
git clone https://github.com/hstaudacher/resize-image-quick-action.git
cd resize-image-quick-action
./install.shThe install script compiles the dialog helper, bundles everything into a self-contained workflow, and registers it with macOS via Automator. The repo can be deleted after installation.
rm -rf ~/Library/Services/Resize\ Image.workflow- You right-click an image and select Quick Actions → Resize Image
- A dialog shows the filename, original dimensions, and two fields for max width/height
- Enter one or both values — the other is calculated proportionally
- The resized copy is saved as
originalname_WxH.extension