MapKmlTools Logo
MapKmlTools

Convert KML to KMZ Online

Compress KML files into KMZ archives instantly. Free browser-based GIS tool with no upload required for fast optimization.

Frequently Asked Questions

Is KML to KMZ Converter free to use?

Yes, compressing KML to KMZ is fully free.

Does KML to KMZ Converter upload my files to a server?

No, the compression process is local with no upload required.

What file formats does KML to KMZ Converter support?

Supports KML files and converts them to KMZ (Zipped KML).

Does it support external images?

Yes, you can include external markers and icons in the generated KMZ.

What is the difference between KML and KMZ?

KML (Keyhole Markup Language) is a plain XML text file. KMZ is a compressed ZIP archive containing the KML plus any images or icons it references. KMZ files are typically 80-90% smaller than the equivalent KML and can bundle assets so they display correctly on any computer.

How much smaller will my KMZ file be?

Because KML is plain text (XML), it compresses extremely well. Expect 80-95% file size reduction. A 10MB KML typically becomes a 500KB-1MB KMZ.

Is my data uploaded to your servers?

No. The entire KML-to-KMZ compression happens inside your web browser using JavaScript. Your files never leave your device.

Why are my icons showing as red X marks in Google Earth?

This means Google Earth can't find the images referenced in your KML (e.g. local file paths like C:/photos/icon.png). When you convert to KMZ here, we bundle those image files inside the archive so they work on any device.

What file size limits apply?

Individual KML files up to 100MB are supported. KMZ output size depends on how much the content compresses — pure text KML files compress dramatically, while KMZ files containing large images compress less.

Earth Pro

Create, Edit & Share KML

Layout Creator

Print-Ready Map Layouts

Map Creator

Interactive Maps + Cloud

New Feature: Bulk upload and processing is now available! You can select multiple files at once.

Select KML file(s)

or drag and drop them here

Select File
4.8(127 ratings)
Was this helpful?

🔗 Related Tools

KMZ to KML
Simplify KML
Merge KML
KML Editor

What is KML to KMZ?

KML to KMZ is a compression tool. KML files are text-based (XML) and can get very large, very quickly. KMZ is a ZIP archive that creates a smaller file.

More importantly, KMZs can contain images. If your KML points to local photos (e.g., C:/MyPhotos/pic.jpg), Google Earth won't show them on another computer. This tool bundles those photos inside the KMZ so they work everywhere.

When Should You Use This Tool?

  • •You need to email a large map file that exceeds attachment limits.
  • •Your KML has Red X icons because image links are broken.
  • •You are sharing a map with photos to a client.
  • •You want to backup your map data in a single file.

How to Use KML to KMZ

  1. Upload your .kml file.
  2. (Optional) Upload any images or icons used in the KML.
  3. The tool matches images to the KML references.
  4. Click 'Convert to KMZ'.
  5. Download the single, portable .kmz file.