GEOO.APP

GMT to KMZ

Convert GMT to KMZ 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 KMZ format

Data Security

All processing is done locally in your browser

Standard Format

Output standard KMZ format

gmt to kmz

Convert gmt to kmz 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

KMZ → GMTGMT → GEOJSONGEOJSON → GMTKMZ → GEOJSONGEOJSON → KMZDWG → KMZDXF → KMZKML → GEOJSONGEOJSON → KML

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.

KMZ

KMZ is the compressed archive format of KML, packaging the .kml file and its associated images, icons, and other resources into a single ZIP archive. KMZ files are smaller and easier to distribute via email or web download. Google Earth can open KMZ files directly, automatically extracting and rendering the geographic content.

Conversion trade-offs

GMT: limitations to know

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

KMZ: what you gain

  • Single file containing all content, easy to distribute
  • Significantly smaller file size after compression

Why convert GMT to KMZ?

Converting GMT to KMZ 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 KMZ 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 KMZ 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 KMZ converter free?

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

Are coordinate systems preserved when converting GMT to KMZ?

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 KMZ output.

KMZ at a glance

Key Features

  • Compressed version of KML with smaller file size
  • Can package associated image and icon resource files
  • Natively supported by Google Earth

Common Use Cases

  • Packaging and distributing KML map data with icons
  • Sharing Google Earth content via email or web
  • Packaging and distributing offline map data

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