No. Conversions happen locally in your browser. Files never leave your device.
Video uses FFmpeg.wasm which runs entirely in your browser. Keep the tab focused and close heavy background apps for best performance.
Limited by your device’s memory and the browser. Large files (200MB+) may be slow or fail on low-memory devices.
Import: GPX, KML, TCX, and FIT. Export: CSV/XLSX and back to GPX/KML/TCX from tables.
Yes. The tool is free to use. We may display ads to support hosting and maintenance.
Yes, after the page loads once. Consider “Install as app” via your browser for quick access.
It’s designed for GitHub Pages. Check our repository readme on the homepage.