HRZ-Creator

Create Stellarium and NINA horizon (.hrz) files from a landscape photo. Runs entirely in your browser — no uploads, no tracking, no backend. If you save the page to disk you can use this on any location!

1) Choose photo

Requires a 360° equirectangular panorama (2:1)..
Recommended: Insta360 equirectangular export..
Phone users: 360 apps that export to a 2:1 image..
Or you can load the built in example!

2) Name & location

Name

Latitude

Longitude

Altitude (m)

Tip: “Use my location” uses your browser’s geolocation. This app has no server and makes no network calls.

3) Continue

How to use: Drag the red N line to set North. Drag the cyan points to trace the skyline, and press + on a line to add more control points. When done, export the ZIP for Stellarium/NINA.

Rectilinear (flat) view

Spherical panorama