Free map tools

Each tool answers one question about a place. They run in your browser: no download, no account. Every one takes a place in its link, like ?q=Denver.

How big is it?

Map area calculator (Geo Measure) — outline a field, a roof or a lot and read its area in acres, hectares, square feet or meters, and its perimeter.
Try: Central Park

How far is it?

Radius map — a circle of any distance around an address or a point, with its area and circumference, shared by link.
Try: 5 miles around Austin · 10 km around London
Distance between two places — the straight-line distance between two addresses or cities in km, miles and nautical miles, with bearing, midpoint and height difference.
Try: New York to London · Denver to Pikes Peak
Distance on a map (Geo Measure) — draw a line along a road, a trail or a shoreline and read its length.

How high is it?

Elevation finder — the elevation of any address or point in feet and meters, several points at once.
Try: Denver · Mount Everest
Elevation profile generator (Geo Elevation) — draw a route and get its elevation chart, total climb and descent, highest and lowest points.

Where is it?

Latitude and longitude finder (Geo Marker) — click any spot for its GPS coordinates in decimal degrees, DMS and DDM.
Try: the Eiffel Tower
Coordinate converter — decimal degrees, DMS, DDM, UTM and MGRS, from a click or a typed value.
Plot points on a map — paste or upload a list of coordinates and see them as markers; export GeoJSON.

Map files

GPX viewer — drop a GPX file to see its tracks, routes and waypoints, with elevation, heart rate and speed charts. The file stays in your browser.
GeoJSON editor — draw points, lines and polygons, edit their properties, download or share the GeoJSON.
Map file converter — GPX, KML, KMZ, GeoJSON and CSV to any of the others, with the file shown on a map first.
Common: GPX to KML · KML to GPX · GPX to CSV · CSV to KML · KML to GeoJSON
KML viewer — open a KML or KMZ file from Google Earth or My Maps and see its placemarks, paths and polygons.
GPS tracks (Geo Tracker) — tracks recorded with the Geo Tracker app, viewed on the web.

Five of the tools are also apps for iPhone, iPad and Mac: see the apps. How the site works and who makes it: About.