Are my files uploaded to the internet?

No. Everything happens in your browser: you can check it by disconnecting from the internet after the page has loaded.

What about portrait mode photos or Live Photos?

The main image is converted. The video part of a Live Photo is a separate .MOV file that you can process with the video profile.

HEIC photos don’t open everywhere. Convert them to compatible JPG or WebP files, keeping the capture date and camera data.

1Move the photos from your iPhone to your computer (they are saved as .HEIC).
2Drop them into FeatherFiles: they are decoded in your browser, with no servers involved.
3Choose «Camera photos» for small WebP files, or edit the profile and set the format to JPEG for maximum compatibility.

Are my files uploaded to the internet?: No. Everything happens in your browser: you can check it by disconnecting from the internet after the page has loaded.
What about portrait mode photos or Live Photos?: The main image is converted. The video part of a Live Photo is a separate .MOV file that you can process with the video profile.