RGB channel viewer
Break an image down into its red, green, and blue channels, each displayed separately in grayscale, plus the alpha channel (transparency) if the image has one.
How it works
Each pixel in a digital image is made up of four values: red, green, blue, and alpha (transparency). For each channel, the tool creates a new grayscale image where the brightness of each pixel directly matches the intensity of that channel in the original image (255 = maximum channel intensity, 0 = completely absent).
What is the use of viewing channels separately?
It is useful for spotting noise or compression concentrated on a specific channel (often blue in JPEGs), analyzing the color distribution of an image, or verifying that an alpha channel contains the expected transparency information before using it in another application.
Why is the alpha channel sometimes completely white?
A completely white alpha channel means the image is fully opaque everywhere (no transparency). This is the case for any format without transparency support, such as JPEG, or for a PNG where all pixels are opaque.
100% local processing: channel separation happens entirely in your browser — your image is never sent to a server.