HERE Polyline Encoder is a free online tool to validate, visualize, and instantly convert GeoJSON data into HERE Flexible Polyline format on an interactive map.
Paste any valid GeoJSON — LineString, Polygon, MultiLineString, MultiPolygon or FeatureCollection — and the tool will validate the structure, render it on the map, and generate the encoded polyline automatically. Compatible with HERE Routing API and other mapping pipelines.
Polyline Encoder is a streamlined tool built specifically for developers and GIS users who work with GeoJSON and need fast, accurate polyline conversion.
Simply paste any valid GeoJSON object — whether it's a LineString, Polygon, MultiLineString, MultiPolygon, or a full FeatureCollection — and the application will immediately validate the structure, display the geometry on the map, and automatically generate a polyline representation.
The editor provides real-time conversion from GeoJSON to HERE Flexible Polyline, ensuring full compatibility with routing engines, APIs, and geospatial pipelines that depend on encoded geometry. Validation includes structural checks, detailed error messages, and instant feedback to help identify malformed or incomplete geometry.
Additional features include map visualization, clipboard copy, file export, interactive error alerts, and support for complex multi-geometry datasets.
Polyline Encoder offers a fast and intuitive workflow for transforming spatial data, debugging geometry, and preparing routes or shapes for use in HERE APIs and other mapping systems.