The photo is redrawn on a blank canvas inside your browser — that process discards every metadata block by construction, so nothing needs to be "detected" correctly for it to be removed.
The first time you use this tab, your browser downloads a small video-processing engine (a one-time download, typically under a minute on a normal connection). After that it's cached and future videos start right away.
The video's picture and sound are copied as-is (no re-encoding, no quality loss) — only the metadata container around them is rebuilt without the old tags.
Yes. Metadata Remover is completely free, with no sign-up and no watermark on what you download.
No. Photos are processed with your browser's own canvas, and videos are processed by an engine that runs entirely on your device. Your file itself is never uploaded anywhere.
For photos: EXIF data such as camera make and model, the exact date and time taken, and GPS location if your phone recorded one, plus any editing-software tags. For videos: embedded metadata such as GPS location, device model and creation date stored in the file container.
