Combine a sequence of night sky frames into one star-trail image. Every pixel keeps its brightest value across the frames (lighten blend); the comet option fades early frames for tapered trails. Also works for meteor composites.
Runs entirely in your browser — your photos never leave your device. Large batches use a lot of memory — up to about 100 frames at 2000 px works in most browsers.
Drop photos here
or click to choose several files · paste works too · nothing is uploaded
or click to choose several files · paste works too · nothing is uploaded
FAQ
How many frames?
Typically 60–300 frames of 20–30 s each; the trail length depends on total time.
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Embed this tool on your site
Free to embed on blogs, club websites and forums — copy the code below. A small credit link is included.