Install Shipyard
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GPX Toolbox
Load GPX tracks in the browser to merge, trim, simplify and re-export, with a map view and elevation profile.
GPX Toolbox loads GPS tracks straight in the browser and lets you merge several into one, trim them by dragging on the elevation chart, simplify to cut point count, and export clean GPX.
Tracks render as coloured lines on an OpenStreetMap view with an elevation profile beneath. Nothing is uploaded; it all runs on your machine. A small, honest utility for hikers and cyclists.