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Absolutely. FastCompressor never uploads or stores your files anywhere. All compression happens 100% offline, directly on your own computer. Your photos and videos stay completely private.

The web version is great for quick, one-off compressions. The Desktop App unlocks the full experience - batch compress entire folders, handle big files without size limits, enjoy faster processing speeds, and work completely offline without needing a browser.

Browsers have built-in memory limits that can cause large or high-resolution videos to fail. For worry-free compression of any file - no matter the size - we recommend our Desktop App, which has zero file size limits.

Yes! Our Desktop App supports powerful batch processing. Simply drag and drop an entire folder of images or videos and compress them all at once. The web version handles one file at a time.

Never. FastCompressor does not add any watermarks, logos, or branding to your compressed files - on the web or the desktop app.

Our smart optimization is designed to reduce file size while preserving visual quality. In most cases, you won't notice any difference from the original - the files just get significantly smaller.

Try switching to a different browser (like Chrome or Edge) or temporarily pausing any strict ad-blockers. If your computer shows an 'unrecognized app' warning, that's completely normal for newer software - just click 'More Info' and then 'Run Anyway' to proceed safely.

Yes, it's safe. macOS sometimes blocks apps from new developers. To open FastCompressor, go to System Settings → Privacy & Security, then click 'Open Anyway' next to the FastCompressor message.

Download the .AppImage file from our download page. Make it executable (right-click → Properties → Permissions → Allow executing), then double-click to run. No installation needed.

No. Once installed, FastCompressor works entirely offline. You can compress files anytime, anywhere - no internet required.