Plenty of converters say your data is private. This guide shows how to check it, using the network inspector built into every browser. It takes two minutes and needs no technical background.
The whole point of GISConverter is that survey points, client parcels and unpublished site boundaries never leave your machine. You should not have to take that on trust. Every browser can list every network request a page makes, so you can watch a conversion happen and confirm that your file is not one of them.
This works because the conversion engine, GDAL/OGR, has been compiled to WebAssembly and runs inside the tab. There is no server to send the file to.
Tick Preserve log so the list is not cleared, and clear it once so you start from an empty table.
Now read the Network table. Every row is one request. Two columns matter: Method and Size.
GET requests, which means the browser is fetching, not sending.gdal3.js with its .wasm and .data payloads, a few megabytes from cdn.jsdelivr.net (or unpkg.com as a fallback). This is GDAL itself being downloaded to your browser. It is cached, so it does not download again..zip or .kmz, and Leaflet when the map preview opens, from cdnjs.cloudflare.com.tile.openstreetmap.org (or Esri if you switch to imagery). A tile URL contains only a zoom level and a tile position. It tells the tile server roughly which area of the world you are looking at, and nothing about the features in your file, which are drawn on top locally.POST or PUT. Those are the methods a page uses to send data to a server.The download itself starts with blob: in its address. That is a file held in your browser's memory, handed to you directly. It never passes through a server, and it is gone when you close the tab.
After one conversion has finished, the engine is loaded. In the Network tab, switch the throttling menu to Offline (Chrome and Edge) or use your system's flight mode. Then convert another file. It still works. A converter that depended on a server could not do that.
The map preview will lose its basemap while you are offline, because the tiles are the one thing that does come from the network. Your features still draw.
GDAL/OGR is the open-source library behind QGIS and most professional GIS software. GISConverter uses a build of it compiled to WebAssembly, a format browsers can run at close to native speed. Instead of moving your data to where the software is, the software moves to where your data already is. That makes the tool free to run at any scale, and it makes the privacy promise something you can test rather than something you have to believe.
No. The basemap tiles are requested by zoom level and tile position, and your features are drawn on top of them inside the browser. The tile server can infer roughly which area you are viewing, but it never receives the coordinates, attributes or shapes in your file. If even the area is sensitive, go offline after the engine has loaded and convert without the basemap.
That download is the GDAL engine itself, compiled to WebAssembly. It is fetched once from a content delivery network, cached by your browser, and reused for every later conversion, including offline ones.
It cannot. There is no server that processes files, so there is nothing to log. As the privacy policy explains, the hosting provider keeps standard access logs (your IP address and which pages you opened), the same as any website.
Mobile browsers hide the network inspector, so the easiest check on a phone is the offline one: convert a file once, switch on flight mode, and convert another. It still works because the engine is already on your device.