A one-second recording interval quickly gives you tens of thousands of points — too big to e-mail, too heavy for a blog and too much for many GPS devices. This thins the track out using the Douglas-Peucker method: points that lie on an almost straight line disappear, corners and bends stay. You set how far the line may deviate at most.
FAQ
What happens to my file?
Your file is sent to the Reisezoom server for processing, handled there and deleted immediately — nothing is stored. So that the web tool and the desktop app arrive at the same number, both use the same component — and that one runs on the server.
Does my route change shape?
No. Only points that sit within your chosen tolerance of the remaining line are dropped. Start and finish always stay.
Which value should I pick?
5 m is a good default for hiking and cycling. 15–25 m makes the file dramatically smaller and is still fine for a blog map. Below 3 m barely saves anything.
Do timestamps and elevation survive?
Yes — the points that remain keep their time and elevation, so duration and ascent stay meaningful.
Which formats can I load?
GPX, FIT, TCX, KML, KMZ, GeoJSON and NMEA. You can download the result as GPX, KML, KMZ, TCX, GeoJSON or CSV.