twineconvert

free · in-browser · no upload

GPX to KML
Converter

Drop your GPX file. We'll convert it to KML right here in your browser, your file never leaves your device.

or drop your file

Select your file here to get started

or drop your file here.

Accepts .gpx

nothing uploaded no file size cap no signup

How it works

Three steps. No upload, no signup.

  1. 1

    Drop your file

    Click the dropzone above or drag a GPX from your desktop. Files of any size, there's no upload, so there's no upload limit.

  2. 2

    Convert in your browser

    The conversion runs entirely in this tab using JavaScript and WebAssembly. Your file never touches our servers, we don't have any.

  3. 3

    Download

    Get your KML the moment the conversion finishes. Convert another, or close the tab.

Files stay on your device

Your file is never uploaded. The entire conversion runs in your browser using WebAssembly. We can't see what you convert because we have no server to see it.

No file size limit

Server converters cap free users at 1-2 GB and gate larger files behind a paid plan. Since nothing uploads, our limit is whatever your browser can handle.

Free, no signup, no ads on conversions

No account required. No watermark on the output. No queue. Drop a file, get a converted file.

Formats involved

About GPX and KML

GPX, GPS Exchange Format

GPX is the de-facto interchange format for GPS data — waypoints (single locations), tracks (recorded routes you walked/biked/drove), and routes (planned paths). XML-based, version 1.1 (2004) is current. Every GPS device, fitness app (Strava, Garmin Connect, Komoot), and mapping tool reads/writes GPX. Cyclists, hikers, and pilots use it to share routes and analyze trips.

How to open

Garmin BaseCamp, Strava (drag-drop upload), Komoot, Google Earth, Gaia GPS, every GPS unit's companion software. Online viewers like gpx.studio render tracks on a map without download.

Full GPX format guide →
KML, Keyhole Markup Language

KML is Google Earth's XML format for geographic data, points, lines, polygons, with optional descriptions and styles. Originally Keyhole Inc.'s format (Google acquired Keyhole and created Google Earth from it). Standardized as OGC KML in 2008.

How to open

Google Earth (free), Google My Maps, QGIS, ArcGIS. Plain XML in any editor.

Full KML format guide →

Related tools

Convert other files to KML

Convert your GPX to other formats

FAQ

Common questions

Is this GPX → KML converter really free?

Yes. No signup, no watermark, no daily file count limit. Every conversion runs in your browser, your file never touches our servers because there are no servers.

Where does my file go when I convert it?

Nowhere. The conversion runs entirely in your browser using JavaScript and WebAssembly. Your file is never uploaded to our servers. We don't have any servers handling files, there's nothing for us to log, store, or accidentally leak.

What's the maximum file size?

Whatever your browser can hold in memory. Practically, this means a few hundred MB on most computers, significantly larger than the 1-2 GB caps that server-upload converters charge for. Very large files (multi-GB) may require closing other browser tabs first.

Why convert GPX to KML?

GPS track and waypoint exchange between devices and apps. Geographic visualization in Google Earth and GIS tools. The most common reason to convert is compatibility, KML works in places where GPX doesn't, or vice versa.

How do I open a GPX file in the first place?

Garmin BaseCamp, Strava (drag-drop upload), Komoot, Google Earth, Gaia GPS, every GPS unit's companion software. Online viewers like gpx.studio render tracks on a map without download.

Does this work offline?

Once the page is loaded, the conversion itself runs entirely offline. The first time you use a tool, your browser downloads the conversion library (a one-time cache). If you reload while offline, the page won't load, but you can install the site as a Progressive Web App for full offline use.

Can I convert multiple files at once?

Single file at a time for now. Batch conversion is on the roadmap, for now, drop one file, download the result, then convert the next.