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GML to KML

GML to KML Converter - Free Online

Quick answer: Convert GML files to KML online for Google Earth-style viewing and sharing. Preview the features and download the KML result locally in your browser.

Before converting GML to KML

Prepare the input

Choose a complete GML dataset (.gml, .xml). Keep required sidecar files together and check the source coordinate reference system.

Know what you download

KML output is an XML geometry and attribute handoff for Google Earth. It is not an asset-complete KMZ and does not reproduce every original style or application extension.

Limits and troubleshooting
  • Converting GML to KML can change field types, metadata and presentation. A successful download does not prove every source element survived.
  • KML styles, tours, overlays, remote links, icon assets and folder semantics may not survive geometry conversion. Retain the original for Google Earth presentation.
  • Confirm WGS 84 longitude/latitude placement in the downloaded output. Missing source CRS cannot be inferred safely; use a desktop GIS to assign or reproject an unknown CRS.
  • Browser memory varies by device. There is no guaranteed unlimited file size; split large datasets or use a desktop GIS when memory or WASM initialization fails.

If something goes wrong

  • Empty or partial preview: confirm the source contains supported vector geometry and compare the source layers with the preview.
  • Wrong continent or distorted geometry: inspect the source CRS, axis order and a known location. Valid syntax alone does not guarantee valid placement.
  • Conversion cannot start: reload while online so processing libraries and WebAssembly can load, then retry a smaller known-good sample. File contents are still processed locally.
  • Incomplete export: compare source/output counts, geometry families and key fields. Inspect warnings and keep the original file.
Task-specific workflow

Convert GML to KML for Google Earth

Use GML to KML when an XML schema-based GIS exchange file needs a visual Google Earth presentation or quick map-sharing output.

  • Preview the XML schema-driven features before exporting to catch unsupported geometry or attributes.
  • KML is best for visual sharing, placemarks, paths, and polygons rather than preserving every GML field.
  • Confirm the source coordinate reference system because Google Earth expects geographic placement.

Prepare your file and check the result

Before opening

Keep the GML file and its coordinate reference information together. GML axis order can differ between schemas; check the srsName before interpreting coordinates.

Before sharing or converting

Confirm the feature count, geometry and a known location. If the map is displaced, check the source CRS and axis order before exporting.

Download a small GML example

Open this example in the tool above. Expect three synthetic points near London: West point, East point and North point. Coordinates span −0.13 to −0.12 longitude and 51.50 to 51.51 latitude. These are demonstration locations, not survey data.

Convert GML geometry to DXF →
Source Format Guide

What is GML?

GML is an OGC XML-based geospatial encoding used in standards-heavy exchange workflows where formal schemas and structured feature descriptions matter.

GML is designed for rigorous geospatial data exchange, especially in environments that value application schemas, XML tooling, and well-defined standards behavior.

That rigor makes GML powerful for formal interchange, but it also makes the format heavier and more verbose than many teams want for routine viewing, editing, or browser distribution.

Common Workflows

Common use cases

  • National mapping, cadastral, infrastructure, and regulated data handoff workflows.
  • Data exchange packages tied to OGC-oriented services or schema contracts.
  • Converting formal XML geospatial exports into more practical working files for analysts.
Ecosystem

Where you will encounter it

  • OGC-aligned exchange and service workflows.
  • Government and enterprise geospatial systems.
  • XML-first integration pipelines.
Strengths

Why teams choose GML

  • Strong fit for standards-oriented and schema-driven exchange.
  • XML structure can represent rich feature content in formal workflows.
  • Widely recognized in OGC-aligned environments.
Limitations

Where GML gets awkward

  • Verbose XML makes files heavier and harder to inspect manually than simpler formats.
  • Many day-to-day GIS users prefer lighter formats for editing and quick review.
  • Browser and consumer tooling usually need conversion before the data is practical to use.
Conversion steps

How to convert GML to KML online

  1. 1. Add your GML file

    Drop the source data into the converter above. Keep any required sidecar files together when your dataset uses them.

  2. 2. Check the map preview

    Inspect the geometry and attributes before exporting so you can spot missing layers or coordinate-system issues.

  3. 3. Download KML

    Run the conversion and save the generated KML output directly from your browser. Your source file stays on your device.

File Structure

Common file extensions and sidecar files

.gml
Main XML file containing geospatial features and schema-driven structure.
.xml
Generic XML extension sometimes used for GML-based content in broader data exchange systems.
XSD schema references
Supporting schema definitions may accompany GML workflows to formalize feature structure and validation.
Conversion Rationale

Why convert GML to KML?

Teams commonly convert GML into KML when they need easy sharing into Earth browsers and visualization-focused tools.

  • Teams convert GML into lighter formats when analysts need easier map preview, quicker editing, or simpler exchange with tools that do not handle XML comfortably.
  • They also convert into GML when a standards-bound delivery specification requires a formal XML representation.
  • KML is a common export target for Google Earth-style review, annotation, and presentation workflows.
  • It is well suited to map storytelling and visual inspection rather than heavy analytical editing.
FAQ

Frequently asked questions about GML to KML

What do I need before converting GML to KML?

Choose a complete GML dataset (.gml, .xml). Keep required sidecar files together and check the source coordinate reference system.

What exactly is in the KML download?

KML output is an XML geometry and attribute handoff for Google Earth. It is not an asset-complete KMZ and does not reproduce every original style or application extension.

How large a GML file can I convert?

The practical limit depends on browser memory, geometry complexity and the conversion driver. Start with a small sample. There is no guaranteed unlimited size and no cloud fallback or payment tier for large files.

Are my GML files sent to a server?

File parsing and conversion run on your device. The page, WebAssembly and map basemaps can make network requests; choosing a file does not upload its contents. Load the required libraries before attempting offline work.

Related Converters

More GML conversion paths

GML to GeoJSON
Open, preview, and convert GML data locally in your browser.
GML to GeoPackage
Open, preview, and convert GML data locally in your browser.
GML to ESRI Shapefile
Open, preview, and convert GML data locally in your browser.

Format workflow cluster

More GML and KML workflows

Use the related viewer, tools, guides, and conversion paths to continue the same GIS task without losing the source format context.