GEOO.APP

GMT to GML

Convert GMT to GML online for free — right in your browser. No upload, no sign-up, batch conversion, coordinate systems and attributes preserved.

Features

Fast Conversion

Efficiently convert from GMT to GML format

Data Security

All processing is done locally in your browser

Standard Format

Output standard GML format

gmt to gml

Convert gmt to gml online for free — right in your browser. No upload, no sign-up, batch conversion, coordinate systems and attributes preserved.

Drag and drop files or folders, or click to upload

Related Tools

GML → GMTGMT → GEOJSONGEOJSON → GMTGML → GEOJSON

About

GMT

GMT ASCII Vectors is a text-based vector data format used by Generic Mapping Tools (GMT) software. GMT is widely used in earth science research and academic paper map making. The GMT format records geographic features as text lines, each containing coordinates and optional attribute information.

GML

GML (Geography Markup Language) is an XML-based geospatial data encoding standard defined by the Open Geospatial Consortium (OGC). GML provides rich geospatial data modeling capabilities, supporting complex geometry types, topology, coordinate reference systems, and spatiotemporal data. GML is widely used in European and government sectors, often for national spatial data infrastructures (SDI).

Conversion trade-offs

GMT: limitations to know

  • Only used in GMT software ecosystem, low universality
  • Does not support complex attributes and style information

GML: what you gain

  • Rigorous standard suitable for government and enterprise data exchange
  • Powerful data modeling for complex geographic concepts

Why convert GMT to GML?

Converting GMT to GML is one of the most common workflows in GIS. GMT data usually comes from desktop GIS software, government open-data portals, or data exchange with partners, while GML is what modern tools, web maps, and platforms expect. This converter bridges the two: it reads your GMT files, keeps geometry and attributes intact, and writes clean GML output — entirely in your browser, so your data never leaves your device.

Frequently asked questions

Are my files uploaded to a server?

No. The conversion runs entirely in your browser using WebAssembly — your files never leave your device.

Is the GMT to GML converter free?

Yes, completely free with no sign-up and no usage limits.

Are coordinate systems preserved when converting GMT to GML?

By default the output keeps the source coordinate system. If your GMT file uses a projected CRS (like UTM), you can search any EPSG coordinate system by keyword or code and reproject in one step. Note: output formats that require WGS84 by specification (KML, KMZ, GPX) always reproject to WGS84 automatically.

Can I convert multiple files at once?

Yes — drop several GMT files at once and each one produces its own GML output.

GML at a glance

Key Features

  • OGC international standard with rigorous specification
  • Supports complex geometries, topology, and spatiotemporal data
  • Extensible Application Schema for domain-specific customization

Common Use Cases

  • Data exchange for national spatial data infrastructures (SDI)
  • Geographic data publishing by government and mapping agencies

How to Use

  1. 1

    Upload your GMT file — drag and drop it onto the page, or browse from your device. You can add several files at once for batch conversion.

  2. 2

    The conversion runs automatically in your browser. No upload, no server — your data stays on your device the entire time.

  3. 3

    Download the GML file. Each input produces its own output, ready to use in your GIS, web map, or archive.