Shrink an oversized GPX, TCX or FIT file by removing redundant points, without visibly changing the route. Free, instant, entirely in your browser.
Drop your GPX, TCX or FIT file here
or click to browse
Nice and lean!
Turn this route into a high-resolution poster for your wall or as a digital print.
Make this map poster →Good to know
A watch recording once a second on a five-hour ride logs eighteen thousand points for a route that could be described accurately with a few hundred. Most of those points sit on what is, geometrically, a straight line, they don't change the shape of the route at all, they just add weight to the file. This tool runs the Douglas-Peucker algorithm, the same curve-simplification method the map poster editor already applies to every upload, letting you choose exactly how aggressively to thin the points with a live before-and-after preview, instead of guessing.
It only ever removes whole points, never data within the points that survive, so elevation, heart rate, cadence and power on the points you keep stay exactly as recorded. At light or medium settings the visual difference is nowhere close to visible on a poster or a map; pushed all the way to maximum you'll start to see corners soften slightly, which is fine when file size matters more than exact precision.
FAQ
Some watches and apps record a GPS point every single second, even along a perfectly straight road, which adds thousands of points that barely change the shape of the route. Simplification removes the ones that don't meaningfully affect the line, keeping the ones that do.
At light and medium settings, no, the change is invisible at normal zoom, since only near-straight-line points are dropped. Push the slider to Maximum and you'll start to see corners round off slightly, useful for a poster where a lighter file matters more than pixel-perfect precision.
Yes, the same Douglas-Peucker algorithm the editor already runs on every upload to keep posters fast to render.
No, only whole points are removed, never fields within a point. Every point that's kept keeps all of its original elevation, heart rate, cadence and power data.
Yes, upload any of the three and download the simplified result in whichever of the three you need.
No. Simplifying happens entirely in your browser. Your file never leaves your device.
It depends on how densely your device recorded points to begin with, but for a typical GPS file recorded at one point per second, a reduction of 70 to 90% in file size with no visible change to the route is common.
More tools
Convert between .gpx, .tcx and .fit formats instantly, right in your browser.
Open tool →Trim the start and end of a route, just like trimming a video, with a live map preview.
Open tool →Correct GPS drift by snapping your route onto the road, without losing off-road sections.
Open tool →The map poster editor accepts GPX, TCX and FIT files directly, simplified or not.
Open the editor →Every file you work on here can become a print or poster.
