Convert TAB to GML Online - Free & Fast

What is TAB?

MapInfo TAB is the native read/write format for MapInfo Professional, storing vector layers with geometry, attributes, styling rules, and projection information in a set of files that together form a complete map layer.

What is GML?

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

When Should You Use TAB vs GML?

TAB vs GML: Key Differences

• •TAB uses lossless compression while GML uses lossless compression — both take the same approach to file size management.
• •Since both TAB and GML use lossless compression, the quality characteristics are comparable — differences in file size come down to how efficiently each format implements compression.
• •Alpha channel support: GML lacks transparency support.
• •Storage footprint: 10KB to 2GB depending on layer complexity for TAB vs Larger than Shapefile due to verbose XML structure for GML.
• •Use case fit: TAB targets mapinfo gis projects, cadastral mapping, desktop spatial analysis and GML targets ogc-compliant geospatial data exchange, enterprise gis — your choice depends on which workflow stage you are serving.

Advantages of TAB

• ✓TAB applies lossless compression specifically calibrated for MapInfo GIS projects, cadastral mapping, desktop spatial analysis.
• ✓TAB enjoys broad native support across operating systems, browsers, and creative tools alike.
• ✓TAB guarantees every bit of the original data survives — no approximations, no shortcuts.
• ✓You will find TAB support built into virtually every tool that handles MapInfo GIS projects, cadastral mapping, desktop spatial analysis — no plugins or converters needed.

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.

Common Use Cases for TAB to GML Conversion

Industry Applications

Best Practices for TAB to GML Conversion

• →For TAB to GML: verify that field name length limits in GML do not truncate attribute column names
• →Test a subset of features first — especially if the dataset contains mixed geometry types
• →Confirm that multi-part geometries (multi-polygons, multi-lines) remain intact after conversion
• →Check for any required sidecar files (.prj, .shx, .qpj) that the target format needs
• →Validate the converted file using a GIS validation tool before relying on it in production

Troubleshooting TAB to GML Conversion

• !GML features land in the wrong place after TAB to GML → verify the CRS/projection; mismatched coordinate systems shift geometry
• !Attribute columns missing in GML → some GIS formats have field name length or type limits; rename or cast columns first
• !TAB to GML drops the z/elevation dimension → pick a target format that supports 3D geometry
• !GML file won't open in your GIS app → confirm the format version and any required sidecar files (e.g. .prj, .shx) are present

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