Free tools
GeoJSON viewer
Paste GeoJSON and get a clean preview. If it's huge, we'll still validate it and let you download it — without breaking the page.
Note: very large GeoJSON may render as a base map preview (URL length limits). Download still works.
1,200+
Maps created
85k+
Locations mapped
<5 min
Avg. setup time
Preview GeoJSON without installing anything
See what your GeoJSON looks like on a map — no setup needed.
- Paste FeatureCollection/Feature/Geometry
- Validate and preview it
- Download the GeoJSON after sanity-checking
Large GeoJSON note
Very large files may not preview visually, but validation and downloads still work.
- Static map overlays have URL length limits
- If your data is huge, preview may fall back to base map—download still works
Fast sanity checks to do before you ship
Swapped coordinates and wrong projections are easy to miss.
- Confirm coordinates look like lng/lat (not lat/lng swapped)
- Check the geometry type matches your intent (Polygon vs MultiPolygon)
- Make sure your data is in WGS84 (EPSG:4326) for web maps
Frequently asked questions
Why is the preview blank sometimes?
Usually the geometry has no valid coordinates, or it's too large for a static overlay URL.
Can I turn this into a real map?
Yes—use MapsMaker and keep the GeoJSON as shapes.
Is this private?
The preview image is a Mapbox URL; don't paste sensitive GeoJSON.
Can I view multiple layers?
This tool previews one GeoJSON at a time—combine layers before pasting if needed.
Is this tool free?
Yes, completely free with no signup required. When you’re ready to publish a full map, MapsMaker plans start at $15/month with a free trial.
Do I need to create an account?
No — this tool works without an account. You only need an account when you want to save, publish, or embed a map.
Turn your GeoJSON into a published map
Import your data into MapsMaker and create a branded, shareable map.