Free GeoJSON file viewer
Open a GeoJSON file and see every point, line and polygon on a map. Click a feature to read its properties and see its size, then save the file as KML, GPX, CSV or a shapefile. No signup and nothing to install.
Drop a GeoJSON file here
or choose one from your computer or phone
KML · KMZ · GPX · GeoJSON. A copy is sent to us to improve the viewer and is deleted after one day.
How to view a GeoJSON file
1. Drop the file on the box above
Or choose it from your computer or phone. Files ending in .geojson open, and so do .json files that hold GeoJSON.
2. Click a feature
Every feature is listed next to the map by its name. Click one to zoom to it and read all of its properties.
3. Read the sizes
Polygons show their area in acres or hectares and the distance around them. Lines show their length. The totals for the whole file are above the map.
4. Save it as another type if you need to
The download menu saves the file as KML for Google Earth, GPX for a GPS unit, CSV for a spreadsheet or a shapefile for GIS programs.
What is a GeoJSON file?
GeoJSON is a way of writing map data as JSON, the text format most web apps use to pass data around. A GeoJSON file holds shapes, such as points, lines and polygons, together with properties: the names and values attached to each shape. Its file name usually ends in .geojson, and sometimes in .json.
The format was written by a group of developers in 2008 and became an internet standard in 2016, published as RFC 7946. Web maps, GIS programs and most mapping code read and write it.
How a GeoJSON file is put together
Most GeoJSON files are a FeatureCollection: a list of features, where each feature has a geometry and a set of properties. The geometry types are Point, LineString and Polygon, their Multi versions for several shapes at once, and GeometryCollection for a mix. The viewer reads all of them, and also opens a file that holds a single feature or a single geometry.
Under the standard, every position is written longitude first, then latitude, in WGS 84, the same coordinate system GPS uses. A file saved in another coordinate system, such as a UTM zone or a state plane, cannot be placed on the map here. Save it as WGS 84 (EPSG:4326) in your GIS program first.
What the viewer shows for a GeoJSON file
Everything comes from the file itself. Nothing is added from anywhere else.
The properties of each feature
Click a feature to see its properties, such as IDs, owners, dates or survey values, in a list you can read without opening the raw file.
Colors saved in the file
Features with stroke and fill properties are drawn in those colors. Everything else is drawn in one clear color over the map.
Area, perimeter and length
Worked out for every polygon and line, in US or metric units, with the totals for the whole file.
Big files
Files up to 400 MB open on a computer, and up to about 150 MB on a phone or tablet. When the list of features gets long, search it by name.
Other ways to open a GeoJSON file
QGIS
Drag the file into the free QGIS program to open it as a layer you can edit, style and save in another format.
GitHub
A .geojson file stored in a GitHub repository is shown as a map when you open it there.
Google Earth and Google My Maps
Neither one opens GeoJSON directly. Save the file as KML on this page first, then open the KML in Google Earth or import it into My Maps.
A text editor
GeoJSON is plain text, so a code editor shows its structure. Long lists of coordinates make large files hard to read this way.
What happens to your file
The viewer opens the file inside your browser, so it shows up right away. A copy is also sent to us, so we can find and fix files the viewer gets wrong. It is scheduled to be deleted automatically after one day, and until then our team may look at it to improve the viewer. Nothing is added to an account.
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