Why this tool is useful
Inventory map features in a spreadsheet, compare two exports or hand coordinates to a non-GIS colleague without uploading the original location dataset.
Local File Tools · runs locally
Private GeoJSON Features to CSV
Flatten GeoJSON features into a reviewable CSV with IDs, geometry summaries, first valid positions and discovered property columns while neutralizing spreadsheet formula prefixes in untrusted text.
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
The browser creates one row per feature, discovers a bounded union of property keys and prefixes cells beginning with =, +, - or @ so they cannot execute as formulas.
Practical example
Export four features with name and website columns while preserving longitude as a number and safely turning an untrusted =SUM(1,2) label into literal text.
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.