Convert GML to WKT Online - Free & Fast

What is GML?

GML (Geography Markup Language) is the OGC standard XML grammar for encoding geographic features with full coordinate reference system support.

What is WKT?

WKT (Well-Known Text) is a simple text markup language for representing geographic geometry objects like points, lines, polygons, and coordinate reference systems.

When Should You Use GML vs WKT?

GML vs WKT: Key Differences

• •GML uses lossless compression while WKT uses lossless compression — both take the same approach to file size management.
• •Since both GML and WKT use lossless compression, the quality characteristics are comparable — differences in file size come down to how efficiently each format implements compression.
• •Transparency: N/A
• •File sizes: GML files typically range Larger than Shapefile due to verbose XML structure and WKT files Very compact text representation.
• •Primary audience: GML is built for ogc-compliant geospatial data exchange, enterprise gis scenarios, while WKT focuses on database spatial queries, geographic geometry exchange, cad — pick the format that matches your output requirement.

Advantages of GML

• ✓GML applies lossless compression specifically calibrated for OGC-compliant geospatial data exchange, enterprise GIS.
• ✓GML enjoys broad native support across operating systems, browsers, and creative tools alike.
• ✓GML guarantees every bit of the original data survives — no approximations, no shortcuts.
• ✓You will find GML support built into virtually every tool that handles OGC-compliant geospatial data exchange, enterprise GIS — no plugins or converters needed.

Advantages of WKT

• ✓The lossless nature of WKT means file sizes stay reasonable while handling Database spatial queries, geographic geometry exchange, CAD efficiently.
• ✓From mobile devices to enterprise servers, WKT is recognized and supported everywhere.
• ✓The trade-off for WKT's perfection is larger files — but for archival work, it is worth every megabyte.
• ✓WKT is a first-class citizen in all major software ecosystems, from creative suites to development environments.

Common Use Cases for GML to WKT Conversion

Industry Applications

Best Practices for GML to WKT Conversion

• →When converting GML to WKT: confirm the coordinate reference system (CRS / projection) is preserved or explicitly reprojected
• →Keep attribute tables and feature metadata intact — WKT should retain all fields from GML
• →Check geometry types (point, line, polygon) map cleanly between the two formats
• →Verify that z/elevation values and topology survive the conversion when working with terrain data
• →Always keep a backup of your original files before converting
• →Choose the appropriate quality settings for your specific use case

Troubleshooting GML to WKT Conversion

• !Topology errors in the converted WKT → self-intersecting polygons or duplicate vertices may not transfer cleanly between formats
• !The WKT file coordinate values shifted slightly → datums (WGS84 vs NAD83) differ even when the projection looks similar
• !Time field values were corrupted after converting GML to WKT → date and time field formatting varies across GIS formats
• !Null geometry features appear in the converted WKT → empty or null-shape records in GML may cause validation errors in some formats

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