Compress Images on Windows vs Mac
Neither Windows nor macOS includes a built-in image compressor that gives you real control over quality and output size. Here's what's actually available on each platform — and why a browser tool is often the fastest option regardless of OS.
Windows options
- Paint — can export as JPG with quality slider. No batch, limited formats
- Photos app — basic resize only, no quality compression control
- IrfanView (free) — excellent batch compression, requires download
- Irreva in Edge/Chrome — no install, browser-based, all formats
macOS options
- Preview — Export as JPEG with quality slider (single file), no batch
- Automator — scripted batch compression via Preview actions
- Squash / ImageOptim (apps) — good Mac-native tools, paid or limited free
- Irreva in Safari/Chrome — no install, works on any macOS version
Browser tool advantage on both platforms
Irreva's image compressor runs identically on Windows, macOS, Linux, and mobile. No install, no compatibility issues, and files stay on your device. For most compression tasks — reducing a batch of photos, hitting a specific KB target, converting to WebP — it's the fastest path.
Frequently Asked Questions
Does macOS Preview lose quality when exporting JPEG?
Yes — it re-compresses on export. Open the original once and export at your target quality; don't open-and-export repeatedly.
Is there a free batch image compressor for Windows?
IrfanView (free) is the best native Windows option. For browser-based batch compression, Irreva handles multiple files with ZIP download.