All free GIS & drone mapping tools

9 browser-based tools for planning flights, checking drone images, working with coordinates and measuring areas, plus file converters for KML, KMZ, Shapefile and GeoJSON. No sign-up, and your files stay on your device.

Runs in your browser
No sign-up
Free

Plan a flight

GSD, overlap and camera coverage for mapping missions

Camera FOV CalculatorPopularHorizontal, vertical and diagonal field of view and ground footprint Drone Overlap CalculatorForward and side overlap from speed, photo interval and line spacing Drone GSD CalculatorGround sampling distance from camera specs and flight altitude

Check drone images

Read GPS, RTK and camera data from your photos

Drone Image Metadata ViewerPopularGPS, RTK status, camera settings and GSD from drone photos

Coordinates

UTM zones, CRS conversion and coordinate formats

UTM Zone FinderUTM zone, EPSG code and MGRS grid zone for any location DD to DMS ConverterDecimal degrees to degrees-minutes-seconds and back, single or batch CRS Coordinate ConverterConvert coordinates between WGS84, UTM, State Plane and other EPSG systems

Measure & convert

Polygon area and survey unit conversion

Area CalculatorPopularPolygon area from coordinates or a KML, KMZ or GeoJSON file Measurement Unit ConverterLength, area and volume, including US survey feet and acre-feet

Convert between formats

Change a file from one format to another without uploading it. Nothing leaves your browser, there is no size limit and there is nothing to sign up for.

Convert KML to ShapefileGoogle Earth KML to a zipped shapefile set, with the attribute table intact Convert Shapefile to KMLShapefile to Google Earth KML, reprojected to WGS 84 automatically Convert KML to KMZPack a KML into a KMZ with nothing changed, at a fraction of the size Convert KMZ to ShapefileGoogle Earth KMZ straight to a zipped shapefile, without unpacking it first Convert KMZ to KMLExtract the KML from a KMZ archive, byte for byte Convert KML to GeoJSONKML to GeoJSON with full-length property names and styling preserved

Any other format: open the universal converter

Coordinate systems, explained

Which coordinate system to use, and why the numbers moved when you changed it. Every guide ends at a tool that runs on your own coordinates, in your browser.

UTM zone by cityZone, EPSG code and distance to the zone boundary for 75 cities.EPSG:4326 vs EPSG:3857Degrees versus Web Mercator metres: what changes, and why neither should be measured in.Ellipsoidal height vs height above sea levelWhy GNSS height is not sea level, what EGM96 does about it, and which altitude your drone wrote.Which coordinate system should a survey in India use?UTM 42N to 47N, EPSG:7755, and the Everest-to-WGS 84 transformation India has never published.WGS 84 vs NAD83Identical in 1986, 1-2 m apart today, and still treated as the same by a lot of software.State Plane zones, EPSG codes and the foot that moves your dataWhich of about 125 zones covers your site, which of its several EPSG codes to use, and what the foot definition costs.Which coordinate system should I use?A three-question decision procedure, plus the unit traps that cost people metres.

Browse every EPSG code the converter supports

When your drone data is wrong

Your drone wrote more into each photo than the picture. These guides read what is there and what it means when it is missing, wrong or not what your processing software assumed. Every one ends with your own files open in the browser.

Export drone photo positions to KML, CSV or GeoJSONThree one-click exports from your own images, what each file actually contains, and the traps on the way in.Your drone photos have no GPSWhich of your images actually lost their coordinates, what the pattern tells you, and what fixes each cause.RTK fixed, float or none: reading the flag out of your own imagesWhat RtkFlag 50, 34 and 16 mean, and how to count how many of your images actually held fix.Your map is in the wrong place: the drone, the datum, or the basemap?Diagnose a shifted orthomosaic from the size, uniformity and direction of the offset.

What the metadata viewer reads

Check a whole dataset

Map LabCheck a whole drone dataset on a map: images, GCPs and flight path

Which tool answers which question

Each tool takes something you already have and gives back a number you can act on. Find the question you are actually asking.

How high can I fly and still resolve a 3 cm crack?

GSD Calculator — you give it: A camera preset or your own sensor specs, plus an altitude.

You get back: GSD in cm/pixel, the ground footprint of one photo, and the field of view.

Will this mission leave gaps in the orthomosaic?

Overlap Calculator — you give it: Flight speed, photo interval, line spacing and the image footprint.

You get back: Forward and side overlap as percentages, and the settings that hit the overlap you want.

How much ground does one photo actually cover?

FOV Calculator — you give it: Sensor dimensions, focal length and altitude.

You get back: Horizontal, vertical and diagonal field of view, and the footprint in metres.

Did the drone record GPS and an RTK fix on these photos?

Image Metadata — you give it: JPG, TIFF or DNG files straight off the SD card.

You get back: GPS position, RTK fix type and accuracy, camera settings, per-image GSD, and the flight path on a map.

Which UTM zone and EPSG code does this site fall in?

UTM Zone Finder — you give it: A click on the map, a coordinate pair, or your current position.

You get back: Zone number and latitude band, the WGS84 EPSG code, the MGRS grid zone and the central meridian.

What is this point in the local grid my client uses?

CRS Converter — you give it: Coordinates and the reference system they are already in.

You get back: The same point in any of 90+ projected and geographic systems, with the datum shift applied.

Why will these coordinates not paste into my GIS?

DD ↔ DMS — you give it: Decimal degrees, or degrees-minutes-seconds in almost any notation.

You get back: Both formats, cleaned up and ready to copy.

How many acres is this site?

Area Calculator — you give it: A KML, KMZ or GeoJSON file, or coordinates you type in.

You get back: Geodesic area in hectares, acres, square metres and square kilometres, the perimeter, and the polygon drawn on a map.

Is that an international foot or a US survey foot?

Unit Converter — you give it: A value and the unit it is in.

You get back: Length, area and volume in every common unit, using exact conversion factors.

Questions about these tools

Do my files get uploaded anywhere?

No. Every tool here runs inside your browser tab. Images, KML and KMZ files, GCP lists and coordinate files are read on your device and never sent to a server, which is also why there is no file size limit and no queue.

Do I need an account?

No. There is no sign-up, no trial timer and no watermark on anything you export.

Which tool should I start with?

Before a flight, start with the GSD calculator to pick an altitude, then the overlap calculator to set speed, photo interval and line spacing. After a flight, open the image metadata viewer to confirm GPS and RTK actually landed on the photos.

Can I trust these numbers for survey work?

They use the same formulas and reference data our own crews work from, and the method behind each one is written out on the about page. Use them for planning and checking, and confirm anything carrying a tolerance against your survey control and your processing software.

Do they work on a phone?

Yes. Every calculator works in a phone browser, which is the point when you are standing on site. The file-based tools need the file to be reachable from the phone, and very large image batches are happier on a laptop.

The formula behind every calculator is written out on the about and methods page.