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The Channel Mixer is a pro photo-editing tool that rebuilds each output color channel — Red, Green, and Blue — from a custom blend of the image's source channels. Instead of editing colors directly, you decide how much of the original Red, Green, and Blue feeds into each output channel, plus a constant offset. That makes it the Swiss-army knife behind a lot of classic looks: swap two channels for a surreal color shift, borrow a cleaner channel to fix a color cast, exaggerate or mute one primary, or fake an infrared-style rendering. Its most popular use is the Monochrome mode, which sends a single gray mix to all three channels to build a custom black-and-white — exactly how film photographers picked a colored filter to darken a blue sky or smooth skin, except you dial the Red, Green, and Blue percentages yourself. This tool applies the mix pixel-by-pixel on the HTML canvas: each output channel = (Red% × R + Green% × G + Blue% × B) ÷ 100, plus the Constant (a percentage of full white, i.e. Constant% × 255 ÷ 100), all clamped to 0–255. Coefficients run from −200% to +200% and the constant from −100% to +100%. Everything happens locally in your browser — your image is never uploaded, the alpha channel is left untouched so transparency is preserved, and there's no sign-up and no watermark.
How It Works
Choose a tool
Pick from 120+ tools to resize, convert, compress, or enhance your image.
Upload & edit
Drag and drop your image and adjust the settings. It stays on your device.
Download
Save your result instantly — no watermark, no sign-up required.
Why Image Machine?
Your files never leave your device
All processing runs locally in your browser. Your images are never uploaded to a server.
Completely free
Every tool is free, with no limits, no watermarks, and no hidden costs.
Lightning fast
No upload waiting — your images are processed instantly on your own device.
Professional quality
Pixel-perfect output with full control over format, size, and quality.
Frequently Asked Questions
What does the Channel Mixer actually do?
It rebuilds each output channel as a weighted sum of the source channels. For the Red output, for example, you choose what percentage of the original Red, Green, and Blue to add together, then a Constant nudges the result up or down. With the default settings each output channel takes 100% of its own source and nothing else, so the image is unchanged — as you move the sliders you redistribute color between channels, which is how channel swaps, cast corrections, and stylized color grades are made.
How do I make a good black-and-white with Monochrome?
Turn on Monochrome and the same gray mix is sent to all three output channels. Set the Red, Green, and Blue percentages so they add up to about 100% — that keeps the overall brightness roughly the same. Then raise a channel to lighten objects of that color and lower it to darken them: drop the Blue percentage to deepen a sky, or raise Red to brighten and smooth skin. A classic starting point is roughly Red 40%, Green 40%, Blue 20%.
What do the Constant and values above 100% do?
The Constant adds or subtracts a flat amount of brightness to that channel, independent of the image — useful for lifting or dropping a whole channel. The source percentages can go above 100% or below 0% to strongly boost or even invert a channel's contribution, which is how you get bold or surreal results. After mixing, each channel is clamped to the valid 0–255 range, so extreme settings simply flatten to pure black or white rather than wrapping around.
Is my image uploaded, and does it keep transparency?
No upload — the Channel Mixer runs entirely in your browser on the HTML canvas, so your image never leaves your device and it works offline once the page has loaded. Only the red, green, and blue channels are mixed; the alpha channel is left untouched, so transparent areas of a PNG stay transparent. There's no sign-up and no watermark.