Coordinate tools
Start with coordinate pairs or a spreadsheet. Convert notation, preserve record attributes, or export WGS84 decimal-degree locations as GeoJSON. Verify the source CRS and column order first; these tools do not geocode addresses or transform projections.
Choose by your input and output
- Convert plain coordinate pairs, including multiple lines: Latitude/Longitude Converter
- Convert CSV/TSV coordinate columns between DD and DMS while retaining the other columns: CSV Coordinate Converter
- Export several WGS84 decimal-degree records as a FeatureCollection: CSV to GeoJSON
- Create GeoJSON for one manually entered location: GeoJSON Point Generator
- Estimate great-circle separation, rather than road distance: Coordinate Distance Calculator
Prepare spreadsheet coordinates for GeoJSON
A practical workflow for column order, WGS84, DD/DMS, row errors, and inspecting a multi-point export.
Tools
Latitude Longitude Converter
Need latitude and longitude in a different format? Convert decimal degrees to degrees, minutes and seconds, or back again. Enter separate fields or paste a batch of coordinate pairs.
CSV Coordinate Converter
Convert latitude and longitude columns in CSV or TSV files between decimal degrees and DMS while keeping other data.
CSV to GeoJSON Converter
Convert CSV or TSV latitude and longitude columns into a GeoJSON FeatureCollection with a local coordinate plot.
GeoJSON Point Generator
Convert latitude and longitude coordinates into a GeoJSON Point Feature. GeoJSON uses [longitude, latitude] coordinate order.
GPS Coordinates Distance Calculator
Calculate straight-line GPS coordinate distance in kilometers, meters, miles, and nautical miles
A spreadsheet-to-map workflow
Verify WGS84 and your latitude/longitude columns → use CSV Coordinate Converter if DMS needs converting to DD → resolve every row error → export with CSV to GeoJSON → inspect feature counts and a known location in your GIS.
Coordinate data questions
Can the tools detect swapped latitude and longitude?
Range checks catch some swaps, but values that fit both ranges can still be reversed. Map the columns yourself and check a known location against the source.
Can I enter Taiwan TWD97 / TM2 coordinates or an address?
Not directly. These tools do not transform projected CRS values or geocode addresses. Obtain WGS84 longitude/latitude first using an appropriate GIS transformation or a separate geocoder.
What does the multi-point preview show?
A local longitude/latitude scatter plot highlights outliers and point clusters. The preview uses your coordinates directly and runs without downloading map tiles.
What are the CSV limits and export rules?
Both CSV tools accept header-based CSV/TSV up to 5,000 data rows and 2 MB. Choose coordinate columns explicitly and fix all reported errors before export. Other columns stay attached to their rows; GeoJSON keeps them as string properties.