1. **100% Local‑Side Processing** GIF files are parsed and compressed inside the browser background worker. Works offline after page load. Guarantees user file privacy, eliminates upload‑queue waiting time. 2. **Multiple Compression Presets** Three built‑in modes: *Better Quality / Balanced / Smaller File*. Users preview animation effect before downloading, trade‑off between visual fidelity and file size. 3. **Full GIF Animation Preservation**