Grayscale Converter — Free Online Tool

Convert any color to perceptual grayscale using Rec.601 luma. Grayscale Converter is a free online tool from the ToolsRift Color Tools collection. It runs entirely in your browser — nothing to install, no signup, and your data never leaves your device.

Loading Grayscale Converter…

How to use Grayscale Converter

  1. Open the Grayscale Converter above — it loads instantly, no account needed.
  2. Enter or upload your input. Everything is processed locally on your device.
  3. Get your result immediately and copy or download it with one click.

Frequently asked questions

How is grayscale calculated?

We use Rec.601 luma: 0.299×R + 0.587×G + 0.114×B, which weights green highest because the eye is most sensitive to it.

Why not just average the channels?

A simple average ignores how the eye perceives brightness. Luma weighting produces greys that match perceived lightness far better.

Is the result always neutral grey?

Yes — the red, green and blue channels are set to the same luma value, giving a perfectly neutral grey.

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