Spatial File Inspector

Diagnose a spatial file's format, CRS, geometry health, and attribute quality before you use it.

How to use

Upload a spatial file — GeoJSON, CSV, WKT, KML, GPX, Shapefile ZIP, GeoPackage, GeoParquet, or GeoTIFF.
Check the CRS Detective, Geometry Health, and Quality Score sections — everything is computed locally, nothing is guessed by AI.
If Geometry Health flags issues, click "Preview Repaired Copy" in the Geometry Repair section — it shows a Before/After comparison (issue count, and any change in total polygon area) and exactly which fixes it applied, then either "Apply to session" (keep working on the fixed version, undo/redo it like any other step) or "Download repaired copy" (the original file is never modified).

Geometry Repair only applies fixes it can make safely and predictably: closing an unclosed polygon ring, correcting ring winding order (RFC 7946), and removing redundant duplicate consecutive coordinates. It deliberately does NOT touch self-intersections, empty/null geometry, or mixed-dimensionality issues — those need a human decision, so they're left in the After list for manual review rather than silently "fixed" in a way that could change what the shape means.
The "Clean Geometry" Smart Workflow runs this same repair automatically (CRS untouched) and re-validates the result — useful when you just want the safe fixes applied without reading the Before/After panel yourself.
"Copy shareable link" turns your repair/workflow steps into a URL — opening it and uploading a file replays the same steps automatically.
Files up to 50MB (25MB for GeoParquet) are supported — parsing happens in a background thread when possible, so the tab stays responsive.

Every result below (format, CRS candidates, geometry issues, quality score) comes from deterministic geometry math run in your browser — nothing is generated by AI, and your file is never uploaded anywhere.

or drop it anywhere here

GeoJSON, CSV, WKT, KML, GPX — up to 50.0 MB; Shapefile ZIP — up to 25.0 MB; GeoPackage — up to 25.0 MB; GeoParquet — up to 25.0 MB; GeoTIFF (metadata only) — up to 100.0 MB

Upload a spatial file to see its format, CRS, geometry health, and quality score.

Preflight Spatial File Diagnostics

Detect file format and encoding, then inspect CRS candidates, geometry health, attribute quality, and the overall quality score before conversion or analysis.

Diagnostic results include geometry and attribute statistics, detected issues, and safe repair recommendations. The original file is never changed automatically; review the recommendations before choosing a conversion tool.

Frequently asked questions

How does CRS Detective guess the CRS?

It's computed locally from coordinate ranges compared against known CRS extents — not by asking an AI model to guess.

What formats and sizes are supported?

GeoJSON, CSV, WKT, KML, GPX, Shapefile ZIP, GeoPackage, GeoParquet, and GeoTIFF, up to 50 MB (25 MB for GeoParquet).

Related GIS guides

Common EPSG Codes Used in Korea How to Identify a Coordinate System How to Diagnose Invalid GeoJSON KML vs GeoJSON

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Spatial File Inspector

Preflight Spatial File Diagnostics

Frequently asked questions

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Spatial File Inspector