Why this tool is useful
Consolidate field surveys, map exports or independently delivered feature files before analysis without handing private coordinates to a hosted GIS converter.
Local File Tools · runs locally
Private GeoJSON FeatureCollection Merger
Combine features from up to twenty saved GeoJSON documents into one clean FeatureCollection, with aggregate coordinate checks and no map, URL or property value ever requested from the network.
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
Every input is parsed through the same bounded GeoJSON validator; valid normalized features are appended in file order and combined limits are enforced before download.
Practical example
Select a four-feature route file and a one-feature location file, then download a single five-feature FeatureCollection while the source files remain in this tab.
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.