Drop a GPX file anywhere on this page, or choose one. Move along the course with the arrows in Street View, the step buttons, play, or by dragging along the elevation profile.
Your file stays in your browser; nothing is uploaded.
This app shows Google Street View, which needs a Google Maps Platform key with the Maps JavaScript API enabled. A key you enter here is kept only in this browser and replaces the site's built-in key. How to get a key.