Image compressor for Mac

Compress images on your Mac without installing anything. Works in Safari and Chrome — just open and compress.

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Works in Safari, Chrome, Firefox, and Edge on macOS

Image Compressor for Mac — Free, Fast & Private

Mac users often reach for Preview or third-party apps to compress images, but there is an easier way. MiniPx runs entirely in your browser — open minipx.com in Safari or Chrome, drop your images, and compress. No installation, no app permissions, no storage used.

Unlike native Mac apps like ImageOptim (which requires a download) or Preview (which has limited compression controls), MiniPx gives you precise control over format, compression level, and output dimensions — all through a simple browser interface.

MiniPx supports all image formats Mac users encounter: JPEG from cameras, HEIC from iPhones (including AirDrop transfers), PNG screenshots from Command+Shift+4, and WebP images saved from the web.

Performance is excellent on Apple Silicon Macs. The M-series chips handle browser-based image processing efficiently — batch compressing 50 photos takes seconds, not minutes. Intel Macs work well too, just slightly slower on large batches.

All processing stays on your Mac. Images are never uploaded to any server, making MiniPx safe for compressing sensitive files, client work, and personal photos.

How it works

Open MiniPx in your browser: Navigate to minipx.com in Safari, Chrome, Firefox, or any browser on your Mac.
Drop images from Finder: Drag photos directly from Finder into the MiniPx window, or click to select files.
Choose compression settings: Select format (JPEG, PNG, WebP), compression level (Gentle, Smart, Tiny), and max width.
Download to your Mac: Compressed images download directly to your Downloads folder. Batch downloads available.

Frequently asked questions

Do I need to install anything on my Mac?

No. MiniPx runs entirely in your browser. Open minipx.com and start compressing immediately. No app download, no permissions required.

Does it work with Mac screenshots?

Yes. Mac screenshots (Command+Shift+4) are saved as PNG files, which are often 1-5MB. MiniPx compresses them to 100-300KB by converting to JPEG or applying PNG optimization.

Can I compress HEIC photos from AirDrop?

Yes. MiniPx reads HEIC files directly in Safari and Chrome. Convert to JPEG or PNG during compression for universal compatibility.

How does MiniPx compare to ImageOptim?

ImageOptim is a native Mac app that requires installation. MiniPx is browser-based — no installation needed. Both produce comparable compression results. MiniPx additionally handles format conversion and dimension resizing.

Is it fast on Apple Silicon Macs?

Yes. M-series chips handle browser image processing very efficiently. Compressing a batch of 50 photos takes 5-15 seconds depending on file sizes.

Does MiniPx work offline on Mac?

Yes. Once the page loads, MiniPx works without an internet connection. All processing happens locally in your browser.