Does Keep Blue Channel upload my file or text to Tool-You servers?

No. Keep Blue Channel runs in this browser tab. Files stay on the device. Limit note: Images. Output PNG. Max 20 MB.

Should I use Keep Red Channel instead of Keep Blue Channel?

Use Keep Blue Channel when you need Zero red and green, then PNG. Use Keep Red Channel when you need Zero green and blue, then PNG. They share a category (Images) but not the same job.

Keep Blue Channel

Zero red and green, then PNG.

Keeps the blue channel and zeros red and green. Unlike Keep Green Channel this is blue only. Unlike Grayscale Image this is a single RGB channel, not luma. Runs in the browser on a canvas.

What Keep Blue Channel does

Keeps the blue channel and zeros red and green. Unlike Keep Green Channel this is blue only. Unlike Grayscale Image this is a single RGB channel, not luma. Runs in the browser on a canvas.

Practical limit for Keep Blue Channel: Images. Output PNG. Max 20 MB. That is why output can differ from heavy desktop Images software. Read the tool-specific note again: Keeps the blue channel and zeros red and green. Unlike Keep Green Channel this is blue only. Unlike Grayscale Image this is a single RGB channel, not luma. Runs in the browser on a canvas.

How to use Keep Blue Channel

Stay on this Keep Blue Channel page (/keep-blue-image). Do not switch to Keep Red Channel unless you actually want Zero green and blue, then PNG..
Add the file type Keep Blue Channel accepts. Hint from the path: keep blue image. Zero red and green, then PNG.
Set only the options that match Keep Blue Channel. Neighbor Keep Green Channel does something else (Zero red and blue, then PNG.). Tool note: Keeps the blue channel and zeros red and green. Unlike Keep Green Channel this is blue only. Unlike Grayscale Image this is a single RGB channel, not luma. Runs in the browser on a canvas.
Run Keep Blue Channel in this tab. Browser memory still applies: Images. Output PNG. Max 20 MB.
Download or copy the result from Keep Blue Channel. If it is the wrong job, open Keep Red Channel instead.

When not to use Keep Blue Channel

Skip Keep Blue Channel when a neighbor tool matches better — start with Keep Red Channel or Keep Green Channel — or when the description already warns the job will fail. In the tool’s own words: Keeps the blue channel and zeros red and green. Unlike Keep Green Channel this is blue only. Unlike Grayscale Image this is a single RGB channel, not luma. Runs in the browser on a canvas.

Questions about Keep Blue Channel

What does Keep Blue Channel do that other Images pages on this site do not?: Keeps the blue channel and zeros red and green. Unlike Keep Green Channel this is blue only. Unlike Grayscale Image this is a single RGB channel, not luma. Runs in the browser on a canvas. Short version: Zero red and green, then PNG.
Does Keep Blue Channel upload my file or text to Tool-You servers?: No. Keep Blue Channel runs in this browser tab. Files stay on the device. Limit note: Images. Output PNG. Max 20 MB.
Should I use Keep Red Channel instead of Keep Blue Channel?: Use Keep Blue Channel when you need Zero red and green, then PNG. Use Keep Red Channel when you need Zero green and blue, then PNG. They share a category (Images) but not the same job.
What are the limits of Keep Blue Channel?: Images. Output PNG. Max 20 MB. Also: Keeps the blue channel and zeros red and green. Unlike Keep Green Channel this is blue only. Unlike Grayscale Image this is a single RGB channel, not luma. Runs in the browser on a canvas.