Combine PNG Channels
Recombine isolated color data maps into a single full-color file. Runs entirely in your browser, so your data never leaves your device.
Drop a file here, or click to browse
Files never leave your device
Drop a file here, or click to browse
Files never leave your device
Output
The result appears here as you type.
How to use Combine PNG Channels
- 1. Add the three channel PNGs. Add the grayscale images representing your red, green, and blue data, typically produced earlier by a channel-splitting step or a rendering pipeline.
- 2. Let the tool recombine them. It reads the luminance of each grayscale file and uses those values as the red, green, and blue components of each output pixel in turn.
- 3. Download the merged PNG. The result is a single full-color PNG built from your three source maps, ready to use wherever the original combined image is needed.
When to use Combine PNG Channels
Combine PNG Channels merges three separate grayscale images back into one full-color file, treating each input as a red, green, or blue map. It reverses channel-splitting workflows common in image processing, compositing, and scientific imaging.
- Reassembling a compositing pass. A rendering pipeline exported separate red, green, and blue passes for individual color grading, and merging them back reconstructs the final composite image.
- Rebuilding a scientific capture. A microscope or telescope captured three grayscale exposures through different color filters, and combining them produces the true-color image researchers actually need.
- Reversing a channel-split workflow. You previously split a PNG into its red, green, and blue channels for individual editing, and now need to merge the edited versions back into one file.
Examples
Merge R, G, B grayscale maps
Input
red.png, green.png, blue.png
Output
combined.png
About the Combine PNG Channels tool
Combine PNG Channels is a free online tool that works entirely inside your web browser. Recombine isolated color data maps into a single full-color file. Because the processing happens on your own device, nothing you enter is uploaded, logged or stored anywhere.
This page is one of 108 PNG utilities on EditSafely. Each one does a single job well, and all of them follow the same rule: your input stays on your machine.
There is nothing to configure. Provide the input and the result appears on its own. The finished file is put together in browser memory and saved with the Download button, so it never touches a server on the way to your disk. A worked example further down the page shows exactly what the tool produces for a real input.
Because nothing leaves your device, the tool is suitable for sensitive content such as internal documents, credentials or customer data. It also responds instantly, since every keystroke is handled on your own machine rather than by a remote API.
Frequently asked questions
Is Combine PNG Channels free to use?
Yes, it is completely free. All 2,658 tools on EditSafely work without an account, a subscription or usage limits.
Are my files uploaded to a server?
Everything happens locally. Your browser downloads the tool's code once, then does all the processing itself; nothing you enter is transmitted, stored or logged. You can even go offline after the page loads and it will still work.
Which files does Combine PNG Channels accept?
It accepts PNG images. There is no file size cap imposed by a server; very large files are limited only by your device's memory.
Do I need to sign up or install anything?
No. The tool works in any modern browser on desktop, tablet or phone. There is no account to create, no extension to add and no software to install.
How do I save the output?
Click the Download button once the result is ready. The file is built in your browser's memory and handed straight to your downloads folder, without passing through a server.