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MapKmlTools

Merge & Combine KML/KMZ Files

Combine multiple KML files into one single archive. Free browser-based GIS merger with no upload required for data security.

Frequently Asked Questions

Is Merge KML free to use?

Yes, combining multiple map files is 100% free.

Does Merge KML upload my files to a server?

No, all merging happens in your browser with no upload required.

What file formats does Merge KML support?

Supports KML and KMZ files from various sources.

Will it preserve the original folder structure?

Yes, the tool organizes merged files into logical folders within the master KML.

How many KML files can I merge at once?

There is no hard limit on the number of files. You can merge dozens or hundreds of KML/KMZ files at once. Total data size depends on your browser's available memory, but 500MB+ of combined data works reliably on modern devices.

Will my folder structure and layers be preserved?

Yes. Use the 'Merge into folders' option to keep each source file organised in its own named folder in the output. The 'Flat merge' option combines everything into a single list.

Is my data uploaded to your servers?

No. All merging happens in your browser. Your map data is never sent to any server.

Can I mix KML and KMZ files in the same merge?

Yes. The tool automatically extracts KMZ archives before merging, so you can freely mix .kml and .kmz files in the same batch.

What file size limits apply?

Individual files up to 100MB are supported. Total merged output size depends on browser memory. For very large datasets (1GB+), consider splitting the merge into batches.

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Select KML/KMZ files to merge

or drag and drop them here

Select File
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What is Merge KML?

Managing multiple KML files can be a headache. The KML Merger is a utility that takes separate files—like daily flight logs, different survey areas, or team contributions—and stitches them into one cohesive file.

When Should You Use This Tool?

  • •You have separate daily GPS tracks you want on one map.
  • •You want to combine data from different team members.
  • •You have a Folder of KMLs you just want to load once.

How to Use Merge KML

  1. Drag and drop multiple files at once.
  2. Reorder them in the list if needed.
  3. Choose 'Merge into folders' (keeps organization) or 'Merge flat' (simple list).
  4. Download the combined 'Merged_Map.kml'.