Star Trail Stacker
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Sky tonight
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Made from a night outside

From frames to a finished night.

Real nights processed with Star Trail Stacker. Look at the photographs, then compare what changed in the stack.

Compare all six modes ↓
Continuous star-trail arcs from the author’s 389-frame Sony A7C night, processed with Star Trail Stacker
Real photographs · processed here · cropped for this view

01 / Star trails

One night. 389 frames.

A Sony A7C sequence, stacked locally in the browser. The original photographs belong to the site owner.

See the full composition ↗
Source
389 Sony A7C frames, 6 MP from RAW
Workspace
Star trails
Credits
Owner photograph
Compare moving-line removal →Inspect a separate gap-fill example →Stack your own night →
M51 after 24 real luminance exposures were registered and integrated in this app
M51 · Peter Sloan · University of Bath · CC BY 4.0

02 / Deep sky

A quieter view of the spiral.

24 luminance exposures of the Whirlpool Galaxy, registered and combined with a median in the app. Compare one exposure with the finished stack at the same brightness.

Source
24 × 32-second FITS Lights
Calibration
Eight matching bias frames
Credits
Peter Sloan · University of Bath · CC BY 4.0
Registered, stacked and resized
Compare exposure / stack →Integrate your own Lights →
Star trails circling the pole above a barn with a stork on its roof, edited for display
Edited for display · every step listed
The same star trails above the barn as the app made them, untouched
Untouched app output · same crop and size

03 / Star trails, edited

A stork on the barn roof.

47 Sony A7C frames, fifteen minutes of a summer night, stacked here with the default recipe; the aircraft that crossed the frame was cleaned out. On the left the same picture after a gentle tone curve that deepens the sky and leaves the ground as it was, a little colour and a chroma-only noise filter; on the right the app’s own output, untouched.

Source
47 Sony A7C frames, 6 MP from RAW
Workspace
Star trails, default recipe
Edits
tone curve, colour, chroma noise
Credits
Owner photograph
Short star trails and the Milky Way above dark hills and a lit village, edited for display
Edited for display · every step listed
The same village and sky as the app made them, untouched
Untouched app output · same crop and size

04 / Star trails, edited

The Milky Way over a sleeping village.

31 Sony A7C frames, about nine minutes of a summer night, stacked here with the default recipe: short trails, the Milky Way, and a village lit along the valley. On the left the same picture after a gentle tone curve that deepens the sky and leaves the dark ground as it was, a little colour and a chroma-only noise filter; on the right the app’s own output, untouched.

Source
31 Sony A7C frames, 6 MP from RAW
Workspace
Star trails, default recipe
Edits
tone curve, colour, chroma noise
Credits
Owner photograph

Explore the possibilities

See what each mode can do.

Compare real app results before adding your own photographs.

  1. Vitaly Bibikov · Sony A7C

    A whole night in one photograph

    Compare in the app →Photo credits
  2. Vitaly Bibikov · Sony A7C

    One night, two brightness choices

    Compare in the app →Photo credits
  3. Peter Sloan · University of Bath · CC BY 4.0

    M51, one exposure and a stack

    Compare in the app →Photo credits
  4. Mike Lewinski · CC BY 3.0

    Follow the stars or the comet

    Compare in the app →Photo credits
  5. Justin Dolske · CC BY-SA 2.0

    Keep the sharpest Moon frames

    Compare in the app →Photo credits
  6. M51 with uneven illumination before matched flatsWithout flats
    M51 after correction with matched flatsWith flats
    Peter Sloan · University of Bath · CC BY 4.0

    What matched flats change

    Compare in the app →Photo credits
Star Trail Stacker

Star trails, nightscapes, deep sky, comet and planetary stacking in your browser. Frames are read on your own device.

Product

  • Open the app
  • Features
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  • Download
  • Pricing
  • What it can read
  • What it refuses
  • Browser support
  • Star trails on a Mac
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  • Your account

Modes

  • Star trails
  • Nightscape
  • Deep sky
  • Comet
  • Planetary
  • Calibration lab

Plan & sky

  • Star Trail Planner
  • Sky Director
  • Milky Way exposure
  • ND filter calculator
  • Light pollution map
  • Northern lights tonight
  • Aurora alerts
  • All planning tools

Learn

  • Your first star trail
  • How to photograph star trails
  • Calibration frames
  • Video guides
  • All guides

Company

  • About
  • What makes it different
  • Measured beside a desktop app
  • Contact

Legal

  • Privacy
  • Cookies
  • Terms
  • Engine Licence
  • Credits and licences

Your photographs stay on your device.

© 2026 Vitali Bibikov, a sole proprietor (JDG) registered in CEIDG, NIP 5213977371, REGON 522636099, trading as AIErudit. All rights reserved.

Version 2026.11.09.1 · What's new

Runs in current Chrome, Edge, Firefox and Safari on computers, and on phones and tablets at a smaller picture size when a night needs it. Desktop apps are in development.

About Privacy Terms Engine Licence Account

May Microsoft Clarity record how you use these pages (clicks, scrolling, page layout), using cookies, so we can fix what confuses people? Only if you accept. Your photographs are never part of it. How we use it