Put a grid
on your map
Every grid on one map: MGRS for military and milsim, GARS for air ops, Maidenhead for radio hams, and custom metric grids for everyone else. A whole set of tools for SAR teams, from search sectors and team assignments to standard incident symbols. Measure distances, annotate, and export print-ready maps, free for personal use, in your browser.
FeaturesData Layers
Public lands (BLM, national forest, park and state land), live weather, and active fires from NASA satellites. Upload your own GRG or reference image and pin it to the map.
Search & Rescue Ready
Sector a search area, assign teams, and mark findings with standard SAR symbols.
Export Anywhere
Geospatial PDF (GeoPDF), true-scale print PDF, screenshots, GPX, KML, GeoJSON and more, out and back in.
Private By Default, Everywhere By Choice
Work auto-saves in your browser and stays on your device. Sign in only when you want maps in your account, on every device.
Standalone utilities that run right here in your browser.
No map, no login, and your files never leave your device.
Lat/Long ⇄ MGRS→
Turn decimal latitude and longitude into an MGRS grid reference, from 100km down to 1m precision, or decode one back to coordinates and UTM.
Lat/Long ⇄ GARS→
Turn decimal latitude and longitude into a GARS reference like 430LE37 at all three levels, or decode one back to its cell.
Lat/Long & UTM ⇄ Maidenhead→
Turn decimal latitude and longitude or a UTM reference into a Maidenhead grid locator like JN58td, or decode one back.
Lat/Long ⇄ Plus Code→
Turn decimal latitude and longitude into a Plus Code like 8FVC9G8F+6X, or decode a full or short code back to its cell.
GPX → KML→
Convert GPS waypoints, routes, and tracks into a KML file for Google Earth and Google Maps.
KML → GPX→
Convert Google Earth placemarks, paths, and tracks into a GPX file for your GPS device.
Inside the map
- What is MapGridder?
- MapGridder is a free, browser-based map tool that overlays MGRS and metric grids on an interactive map. You can measure distances, place MIL-STD-2525 tactical symbols, import and export GPX and KML files, and export print-ready maps, all without installing anything.
- Is MapGridder free?
- Yes. The map and every tool run in your browser with no fee and no install. You can use the whole tool without an account; a quick, free sign-in is only needed to capture or export a finished map, or to keep named maps in your account and open them on any device.
- What grid systems does it support?
- Two: a live MGRS (Military Grid Reference System) grid, which divides the Earth into 6 degree by 8 degree zones and then into 100,000 meter squares down to 1 meter, and a custom metric grid you can set from 10 meters to 10,000 meters with row and column labels.
- Can I import and export GPX, KML, and GeoJSON files?
- Yes. Import GPX or KML files up to 5 MB and export your data back to GPX, KML, or GeoJSON. Files are read and written on your device, so nothing is uploaded to a server.
- Can I export a map to PDF or image?
- Yes, several ways. Export a print-ready PDF at true scale on A4, A3, or US Letter at 150, 300, or 600 DPI, a PNG image, or a geospatial PDF (GeoPDF) that offline map apps open with your live GPS position. Data goes out as GPX, KML, or GeoJSON. The grid, routes, waypoints, symbols, and annotations are all included.
- Can I share the map with my team?
- Yes, with a magic link. Save the map to your account and share it as a read-only link that opens in any browser, on mobile or desktop, with no account needed on their end. Your team can pan and zoom the map but cannot change it. The link lasts 30 days and you can stop sharing at any time.
- Who is MapGridder for?
- Route planners working with GPX and KML, hikers and camping trip planners, plus milsim players and army cadets who need MGRS grids and tactical map symbols. Search and rescue teams use it to sector and assign search areas. Security and event teams plan perimeters, post positions, radius standoffs and patrol routes on one gridded map that every guard can read from the same reference, and share it with the crew before the gates open. Anyone who needs a precise grid or coordinate reference on a map can use it.