Nighttime mountain landscape with star trails in the sky, snow-covered mountain peaks, forest, and trees in the foreground.

Why Our Star Trails App?

Blazing fast star trails stacking packed with features. With multiprocessing technology, RAW support, Comet Mode, and timelapse output, Startrails Stacker handles massive stacks effortlessly — so you spend less time waiting and more time creating stunning star trails.

ARW

CR2

CR3

NEF

DNG

RAF

ORF

RW2

PEF

ARW CR2 CR3 NEF DNG RAF ORF RW2 PEF

A landscape of mountains and the sunset stacked using Startrails Stacker, with a colorful forest in fall and featuring a house among trees.

Full RAW support

Startrails Stacker handles all major RAW formats and standard files types — giving you professional-quality stacking no matter your camera.

RAW formats: ARW, CR2, CR3, DNG, RAF, ORF, RW2, PEF, NEF (not HE)

Standard formats: TIFF, TIF, PNG, JPEG, JPG

Additionally, we support up to 16 bit images.

Fast. Smart. Efficient.

Startrails Stacker uses multiprocessing technology to stack lightning-fast—and lets you decide how many processors to use, so you get maximum speed without slowing down your computer.

This is an example video of stacking 283 ARW images, each over 200mb, in just over 30 seconds.

Long-exposure photograph of star trails over a lake with reeds in the foreground and hills in the distance.

Comet Mode

Turn ordinary star trails into stunning comet-like streaks with adjustable tail lengths for maximum creative impact.

Timelapse Output

Create a smooth star trails timelapse video with customizable duration, letting you watch your startrails come alive exactly how you want.

Nighttime landscape with star trails in the sky, mountains, and a reflected calm body of water with light streaks on the horizon.

Chunk 1

Long exposure photograph of star trails in the night sky over a mountain lake, with the reflection of the stars and mountains visible on the water's surface.

Chunk 2

Night sky with star trails generated with the star trails app over a dark landscape and a reflective body of water.

Chunk 3

Edit Your Way with Chunks

Startrails Stacker can save your images in chunks, letting you edit or remove specific sections later—perfect for precise control over every part of your star trail sequence, with as little as 5 files per chunk!