Squish

Shrinks images to a file size, dimension limit, and format you choose.
Drop in files or folders; get JPEG or HEIC copies back.

Features

• Settings as pop-up menus: file size, dimensions, format, and destination are each a pop-up menu in the window.
• Sliders: File size and Dimensions open on a slider. Dragging applies the value while the menu stays open.
• File size presets: Uploads 50 MB, Print 25 MB, Share 10 MB, Email 5 MB, Web 1 MB, Small 500 KB. Or drag to any limit, or pick no limit.
• Dimension limits: long side, width, or height, or Fit Within a Box… for both. Images are never upscaled.
• Formats: JPEG, or HEIC for smaller files on Apple devices. Reads anything ImageIO reads, including PNG and WebP.
• Folders: drop a folder and its structure is kept in the output.
• Results list: before and after size for each file. Drag rows into Mail or Slack, press Space for Quick Look, double-click to open.
• Dock badge: the icon badges and bounces when a batch finishes while you're in another app, with an optional sound.

Install

Squish is not sandboxed and is not notarized, so you build it yourself. You need macOS 14+ and Xcode 26.

git clone https://github.com/dmccullum/Squish.git
cd Squish
./"Build Squish.command"

The script builds a Release copy, installs it to /Applications, registers the Finder service, and launches it. You can also open Squish.xcodeproj in Xcode and press Run, or build from the command line:

xcodebuild -project Squish.xcodeproj -scheme Squish -configuration Debug build

Usage

Drop images or folders on the window or on Squish in the Dock. Other ways in:

• ⌘O opens a file picker.
• Squish Images in Finder's Quick Actions and Services menu.
• Open With on any image or folder.

Shortcut	Action
⌘O	Choose images
⌘R	Show results in Finder
⌘.	Stop the running batch
⌘,	Settings
Space	Quick Look the selected result

The same choices are in the Recipe menu in the menu bar.

Where files go

With next to the originals:

You drop	Output
One image	name (squished).jpg beside it
Several items	A Squished folder in their common parent
A folder	A sibling <name> (squished) folder with the same structure

With a chosen folder, everything goes there. Dropped folders keep their structure.

How it works

• File-size targeting binary-searches encoder quality, then downscales if the lowest quality still overshoots.
• Batches either hit the target per image, or match quality across the batch (Settings): the quality that brings the heaviest image to the target is applied to all of them.
• If re-encoding would make a file larger, Squish keeps the original bytes.
• Images are processed concurrently across CPU cores. A failure affects only that file.
• Settings has the batch strategy, finish sound, and editable pixel-size and file-size presets.

Project layout

Path	Contents
Squish/Core	Image compression, job running, output paths
Squish/Models	Recipe, settings, drop input, results
Squish/Views	SwiftUI views and menus
Config/Info.plist	Document types and the Services entry
Icon	App icon sources (Icon Composer .icon, SVGs, generator scripts)

New files under Squish/ are picked up automatically by the Xcode project.

License

MIT