JSZip Used for ZIP file generation in the browser. No server required.
stuk.github.io/jszip · MIT License

Canvas API Used for image decoding, resizing, and re-encoding. Built into all modern browsers.

Service Worker + Web App Manifest Used for offline support and installability (PWA). No external dependencies.

100% Local Processing All image compression happens entirely in your browser using the Canvas API. Your files never leave your device.

No Uploads No image data is ever uploaded to any server. There is no backend — this app has no server component at all.

No Tracking or Analytics No cookies, no analytics scripts, no user tracking of any kind. The app works fully offline after the first load.

No Persistent Storage Nothing is stored in localStorage, IndexedDB, or any other persistent storage. All data is cleared when you close the tab.

Provided "As Is" This tool is provided without warranty of any kind, express or implied. Use at your own risk.

No Liability The developer is not responsible for any data loss, file corruption, or other issues arising from the use of this tool.

Keep Backups Always keep a backup of your original files before batch processing. Compression is lossy for JPEG/WebP formats and cannot be undone.

Free to Use This tool is free for personal and commercial use. You may not redistribute it with false attribution.