Blog
Guides and use cases for grid overlays, distance measurement, and spatial planning.
Start with a guide
Map Grid References
MGRS, UTM, and custom grids, how to read a grid square, and how to overlay one on any map.
GPX and KML
Open, edit, and convert GPX and KML files, measure distances, and export to PDF or GeoJSON.
All articles
What Is GeoJSON? Format, Structure, and Every Geometry Type
June 1, 2026
A technical explainer of the GeoJSON format (RFC 7946): the FeatureCollection / Feature / Geometry structure, longitude-first coordinate order, all seven geometry types, the bbox member, and the gotchas that trip people up. With real JSON examples.
Read article →How to Export a Map to GeoJSON (Free, In Your Browser)
June 10, 2026
Save your waypoints, routes, measurements, shapes, symbols, and grid lines as a standard GeoJSON FeatureCollection. One file that almost every mapping and GIS tool can open, built entirely in your browser with nothing uploaded; a quick, free sign-in is only needed to export.
Read article →How to Export a Map as PDF at Real Scale, with MGRS Grid and Annotations
May 10, 2026
A step-by-step guide to exporting your map as a high-resolution image or as a paper-sized PDF (A4, A3, Letter) at a real cartographic ratio (1:10,000 to 1:1,000,000), with the MGRS grid, annotations, and waypoints baked in.
Read article →Free MGRS Grid Overlay: NATO-standard grid on any map
March 21, 2026
MapGridder supports MGRS, the NATO-standard worldwide geocoordinate grid. Useful for OSINT analysts, navigation hobbyists, geocachers, and map enthusiasts. Free to use, no login, with the coordinate math running entirely in your browser.
Read article →How to Edit GPX Files Online: View, Annotate, and Export GPS Tracks
March 14, 2026
Import a GPX file from Strava, Garmin, or AllTrails. View the track, annotate the route, overlay a reference grid, and export a clean screenshot. No software to install; a quick, free sign-in is only needed to export.
Read article →Free Map Grid Tool: No Watermark, No Fees
March 9, 2026
Most online map tools watermark exports, charge fees, or force sign-up. Here is why free tools are so rare, and how MapGridder breaks the pattern.
Read article →5 Ways to Use a Grid Overlay on Maps for Better Planning
March 8, 2026
From event layouts to volunteer field coordination, learn how a simple metric grid (combined with annotations and waypoints) transforms spatial planning.
Read article →Grid Referencing for Beginners: How Row-Column Labels Work
March 9, 2026
Understand how grid references like "B3" or "D7" let teams communicate positions on a map without GPS coordinates.
Read article →How to Measure Distances on a Map Without GIS Software
March 9, 2026
A quick guide to using browser-based tools for straight-line and multi-point distance measurement on interactive maps.
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