Kompressor vs Squoosh
Squoosh is a free web app from Google that compresses one image at a time. Kompressor is a Mac app for batches and folders. This is how they differ.
The short answer
Squoosh is an excellent free tool for one image. It runs in the browser and gives you many expert settings. Kompressor is the better tool when you have more than a few images, because Squoosh processes one image at a time.
Comparison
| Kompressor | Squoosh | |
|---|---|---|
| Price | $14.99 one-time, 3 free conversions | Free and open source |
| Type | Mac app | Web app in the browser |
| Batch conversion | Files and folders with drag and drop | One image at a time |
| Result preview | Original and result side by side, with file size | Original and result side by side, with file size |
| Output formats | More than 20, among them JPEG, PNG, WebP, AVIF, HEIC | MozJPEG, OxiPNG, WebP, AVIF, JPEG XL and more |
| Encoder settings | Quality, size, metadata | Many expert settings for each encoder |
| Images stay on your device | Yes | Yes |
| Analytics | None | Google Analytics |
What Squoosh does well
Squoosh was made by the Google Chrome team to show what modern image formats can do. It compresses the image in your browser and does not send it to a server. You see the original and the result side by side, and you can change each detail of the encoder. It works on each operating system, and it costs nothing. For a single hero image where each kilobyte is important, Squoosh is hard to beat.
When Kompressor is the better tool
- You have many images. Squoosh has no batch mode. In Kompressor you drop a folder and all images are converted.
- Your images are HEIC or RAW files. Kompressor reads all formats that macOS reads, among them iPhone HEIC photos and camera RAW files. Squoosh has no decoder for RAW files, and it opens HEIC files only in a browser that can decode them.
- You want no tracking at all. Squoosh does not upload your images, but it uses Google Analytics. Kompressor has no analytics and works with no internet connection.
- You want a fast result. Kompressor has three controls: format, quality and size.
Facts about other apps are from their official websites, as of November 2026.
Kompressor in short
Kompressor is an image converter and compressor for Mac (macOS 14 or later, or macOS 13 or later from the Mac App Store). It reads more than 50 formats, among them HEIC, WebP, AVIF and camera RAW, and writes more than 20, among them JPEG, PNG, WebP, AVIF and HEIC. It converts files and whole folders with drag and drop, shows the result and its file size before you convert, and works offline with no analytics. You get 3 free conversions with as many images as you want. A license is a one-time payment of $14.99.