Why this tool is useful
Move a private GeoJSON dataset into a KML-compatible desktop mapping workflow without granting an online converter access to locations or feature attributes.
Local File Tools · runs locally
Private GeoJSON to KML Converter
Convert GeoJSON features and supported geometry collections into an inert KML document, retaining names, descriptions and properties while excluding invalid coordinate positions and every external fetch.
Ready. Your working data stays in this browser.
Files and capture streams stay on this device. Processing uses browser APIs only; nothing is uploaded to YTSave, the media API or a proxy. No server copy is created, stored or left to delete. The file picker is cleared when processing starts, and disposable worker memory is destroyed after completion or cancellation. Preview and generated-output memory is released when you clear the tool or leave the page.
How it works
Each source feature becomes one Placemark; geometry is converted locally, XML text is escaped and URL-like property values remain inert instead of being requested.
Practical example
Convert points, a route, a polygon and a mixed GeometryCollection into four KML placemarks, then download the result for a local map viewer.
Validation
The calculation is deterministic and explains validation errors instead of silently changing invalid input.
Privacy boundary
Input and output remain in this tab. Copy and download happen through browser APIs without a server upload.
Result passport
Every run reports its tool mode, timestamp and input/output size so transformed data can be audited.