There are several useful and free GIS tools around the Web for viewing, creating, manipulating, and converting geospatial data.
- Mapshaper
Mapshaper is software for editing Shapefile, GeoJSON, TopoJSON, and CSV. Mapshaper supports essential map making tasks like simplifying shapes, editing attribute data, clipping, erasing, dissolving, filtering and more
- Map Warper
Georeference scanned map images or photos in this online web interface. You can then download and use the map in GIS software or applications.
- Coordinate Conversion
This Web tool allows the user to convert latitude and longitude between decimal degrees and degrees, minutes, and seconds.
- Area Conversion Tool
Easily convert between units of area measurement .
- GeoJSON.io
Geojson.io allows users to quickly view, edit, or create GeoJSON data with attributes on a Web-based platform. No GIS software needed!
- USGS Extent Helper
A tool from USGS which provides users with the ability to draw a rectangle on the map and coordinates are returned in a variety of different formats.