Online Long Exposure Simulator
Stack multiple frames to fake a long exposure and cut noise with our free image averaging tool, which blends every shot inside your browser.
- 1Add your imageJPG, PNG or WebP — it stays in this tab
- 2Pick a lookCompare the options on your own photo
- 3Press the buttonThen download the version you liked
Add one above. It is read in this tab and never uploaded.
Press Blend the photos and the blended frame appears here.
How to use it
How to Simulate a Long Exposure Effect Online
Capture the Sequence
Take multiple photos of a scene. Use a tripod or stay as still as possible for the best alignment.
Upload to Stack
Select all the photos you want to average at once. Our online image averaging tool works best with 5+ images.
Process & Download
Click "Process" to mathematically stack the images. Moving objects will disappear, and noise will be eliminated.
About this tool
About Our Image Averaging & Stacking Tool
Ever wanted to capture that "silky water" look or make a crowded tourist spot look empty without using expensive filters? Our free online long exposure simulator uses the power of mathematics to achieve these professional results. By averaging multiple photos online, we can simulate a single long exposure.
The core principle is simple: random noise and moving objects vary from frame to frame, while the static landscape stays constant. When you stack photos online, the random elements are averaged out, leaving you with a crystal-clear, noise-free image that looks like it was taken with a high-end ND filter.
Why Use Our Stack & Average Tool?
- Noise Reduction by Stacking: Eliminate high-ISO grain for cleaner night shots.
- Ghost Removal Online: Make pedestrians and traffic disappear from your cityscapes.
- Silky Motion: Soften waterfalls and waves for a dreamlike artistic effect.
- Zero Upload Privacy: As a secure image stacking no upload tool, your photos never leave your device.
- Completely Free: Professional-grade simulation without the high software costs.
Common questions
Frequently Asked Questions
What is image averaging?
Image averaging is a technique where multiple photos are combined by calculating the average pixel value for every coordinate. It's the best way to reduce noise by stacking photos.
How many photos should I upload?
For significant online image noise reduction stacking, we recommend at least 10 to 20 photos. For ghost removal from photos online, more frames increase accuracy.
Do I need a tripod?
Yes, for the best professional photo stacking tool free results, your camera should stay in the same position for all shots.
Is this tool private?
Yes. This is a private long exposure simulator. Everything happens in your browser's RAM; nothing is uploaded or saved on our servers.
Can this replace a real ND filter?
Mostly, yes! Stacking and averaging is a digital equivalent. While a real ND filter is better for long light trails, image averaging tool online is superior for noise reduction.
Check for yourself that nothing is uploaded
🔎 Verify it yourself: nothing uploads
Don’t take our word for it. Open your browser’s DevTools (F12 → Network tab), then run this tool on any image. You’ll see no upload request at all — your file never leaves this tab. You can even turn off Wi‑Fi once the page has loaded and keep working. Every tool on this site works the same way — all processing happens on your device.