StarStacky — Stack & align your night sky photos in the browser

Add photos: your star shots (RAW/DNG, TIFF, JPEG, PNG, HEIC). Mark one as the Base if you like, otherwise the first is used.

Set options: press the i next to any option for details.

Stack: the stars are aligned and combined, then you download the result as a 16-bit TIFF or JPEG.

How StarStacky works