top of page
Search

Understanding the Difference Between KML and KMZ File Formats

  • Writer: Anvita Shrivastava
    Anvita Shrivastava
  • 1 day ago
  • 3 min read

When working with geographic data in applications such as Google Earth or GIS, you will frequently encounter file formats like KML and KMZ. Although these two formats are closely related, understanding their key differences can help you select the appropriate one for your project.



Creating a KMZ or KML in Google Earth
Creating a KMZ or KML in Google Earth

What is a KML File?


KML, short for Keyhole Markup Language, is an XML-based file format developed by Keyhole Inc., which was later acquired by Google. KML files are used to display geographic data such as:


  • Points (e.g., location markers)

  • Lines (e.g., routes or boundaries)

  • Polygons (e.g., area outlines)

  • Images

  • 3D models


These files are human-readable and can be opened with any text editor. KML is widely supported in programs like Google Earth, Google Maps, and various GIS software platforms.


Key Features of KML:


  • Uses XML syntax

  • Easy to edit and customize

  • Can include style elements for customizing map appearance

  • Supports time-based features for animations and tours


What is a KMZ File?


KMZ is essentially a compressed version of a KML file. The “Z” stands for “zipped.” A KMZ file can contain one or more KML files, along with associated resources such as:


  • Images

  • Icons

  • Collada 3D models (.dae files)

  • Other assets used by the KML


The KMZ format bundles everything into a single file, making it easier to share and distribute complex geospatial data.


Key Features of KMZ:


  • Compressed for a smaller file size

  • Can include multiple files and resources

  • Ideal for packaging maps with embedded images and icons

  • More portable than a standalone KML


KML vs. KMZ: Key Differences

Feature

KML

KMZ

Format

XML-based text file

Compressed ZIP archive

File Size

Larger

Smaller due to compression

Readability

Human-readable

Must be unzipped to read KML inside

Includes External Resources

No

Yes (images, models, etc.)

Use Case

Simple data overlays

Complex presentations or tours

When to Use KML or KMZ


Use KML if:


  • You’re working with simple map data.

  • You want to easily view or edit the file in a text editor.

  • You’re not including external media like images or icons.


Use KMZ if:


  • You need to package multiple files together.

  • You want to include custom icons, images, or 3D models.

  • You’re sharing a tour or presentation with multiple elements.


How to Create and Convert KML/KMZ Files


Most GIS tools and Google Earth allow you to export data in both KML and KMZ formats. You can also convert between them easily:


  • To convert KML to KMZ: Compress the KML and its resources into a ZIP archive, then rename the extension to .kmz.

  • To convert KMZ to KML: Unzip the KMZ file to access the contained KML file and resources.


Both KML and KMZ are powerful tools for sharing and visualizing geographic data. While KML is great for simplicity and transparency, KMZ is your go-to format when you need a self-contained file with all your visual assets. By understanding the difference between KML and KMZ, you can make more informed choices in your mapping projects.


For more information on creating a KML or KMZ file using Google Earth, please feel free to contact us at:



USA (HQ): (720) 702–4849

India: 98260-76466 - Pradeep Shrivastava

Canada: (519) 590 9999

Mexico: 55 5941 3755

UK & Spain: +44 12358 56710



Comments

bottom of page