Free Online GIS Tools
Free, browser-based GIS tools for coordinate conversion, CRS detection, GeoJSON validation, bounding boxes, GPS format conversion, tile math and more. All processing happens locally — nothing is uploaded to any server.
GeoJSON Draw Tool
Draw 12 geometry types on a map: Point, Polyline, Polygon, Freehand, arrows, curves, sector, and more. Export as GeoJSON.
Coordinate Converter
Convert coordinates between Decimal Degrees, DMS, UTM, and MGRS formats instantly in your browser.
CRS / SRS Detector
Upload a GIS file to detect its coordinate reference system and projection metadata automatically.
GPS File Converter
Convert GPS files between GPX, FIT, IGC, and GeoJSON formats directly in the browser.
Bounding Box Tool
Draw or enter a bounding box on the map and export as GeoJSON, WKT, or MapLibre-compatible URL.
GeoJSON Validator
Validate GeoJSON files and strings for structural correctness and schema compliance.
Map Tile Calculator
Calculate tile counts, zoom levels, and storage estimates for a given bounding box and tile format.
UTM Zone Finder
Find the UTM zone for any latitude/longitude coordinate and get the EPSG code.
Measure Distance
Click points on a map to measure the length of a route, trail, or custom path.
Measure Area
Click points on a map to calculate the area of a polygon or enclosed region.
Elevation Finder
Click any point on a 3D elevation map to read its estimated elevation in meters.
Radius Map Tool
Draw a circle radius on a map around any location for distance and area analysis.
Driving Radius Map
See how far you can drive within a given travel time from any city.
Current Location & Weather
Find your current location, address, and local weather information on a map.
World Time Zones
View current times across all world time zones on an interactive map.
OpenClaw Exposure Map
View the OpenClaw tsunami and storm surge exposure map for coastal areas.
About These Tools
All tools on this page run entirely in your browser. No files are uploaded to any server — your data stays on your device.
These are designed to complement the GeoDataViewer Studio and Free GIS Data Directory. Use the Studio for full GIS file viewing and conversion, and the tools here for quick spatial calculations.
New tools are added regularly. Contact us if you have a suggestion.