Why not just use the built-in tools?

macOS Preview can export some formats but lacks a live size target, so hitting an exact file size is trial and error. A browser-based tool gives you precise control and works the same on every device.

Steps on Mac

  1. Open this page in any browser on your Mac and tap the tool below.
  2. Select or drag in your image — it is processed locally, never uploaded.
  3. Adjust the settings, then save the result back to your Mac.

Tips

  • Works in Safari, Chrome and Edge — no app store download needed.
  • Because it runs offline in the browser, it is safe for private photos and documents.