Curated list · updated 2 November 2026
Best Free GPX, GeoJSON and KML Tools Online
The distinctive cluster on this site: file tools that parse in the browser and tell you what they dropped.
Map file tools are where free sites usually cut corners, because parsing and validating is less glamorous than drawing a circle. These pages do the unglamorous work: count the features, measure the track, check the coordinate order and state exactly what a conversion loses.
Everything runs locally with browser-native parsers, so a personal track log does not need to be uploaded to anything.
- 1
GPX Route Stats
Point, route and waypoint counts, distance, duration and ascent in one summary.
- 2
GeoJSON Validator
Verify the structure and coordinate ranges before a map library silently rejects it.
- 3
KML Path Length
Measure the linework inside a KML file in kilometres and miles.
- 4
GPX Merger
Combine tracks from several days or devices into one file.
- 5
GeoJSON Simplify Helper
Reduce coordinate density for web maps without breaking the shape.
- 6
Encoded Polyline Decoder
Turn a Google-style encoded route string back into coordinates.
- 7
- 8
How this list was chosen
One pick per format family plus the two highest-value converters. Fidelity notes are shown on every conversion page rather than buried in documentation.
MapBench is a single site, so this is a recommendation list rather than an independent market survey. Every listed tool is free, needs no account, and publishes the method behind its result.
Browse the full clusters
Read before you rely on the number
- KML vs. GeoJSON vs. GPX: Choosing the Right Map File Format
The practical differences between three common geographic file formats — when to use each, what can be lost in conversion, and how to move between them.
- Free Printable Blank Maps: How to Choose Outline, Labeled, or City Variants
Classroom worksheets, sales territories, and presentation slides need different map styles. How to pick blank vs labeled vs coloured — and SVG vs PNG.
- Understanding GPS Coordinates: Formats, Datums and Precision
A practical guide to latitude/longitude: what decimal degrees and DMS really mean, why datums matter, and how many decimal places you actually need.
Common questions
Are my files uploaded?
No. Files are read in the browser with native parsers. The only network requests are for map tiles and place search.
Which format is best for a recorded track?
GPX preserves timestamps and elevation, which is exactly what a track analysis needs. Convert to GeoJSON only when a web map needs it.