Grayscale Image Converter

Runs in your browser — your files are never uploaded.

Desaturate a PNG, JPG or WebP image to grayscale using a standard luminosity formula, keeping the original format and dimensions. Runs entirely in your browser.

How to use Grayscale Image Converter

  1. 1

    Drop your image onto the box, or click to choose one.

  2. 2

    OkConverter desaturates it locally.

  3. 3

    Click “Download” to save the grayscale image.

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Frequently asked questions

How is the grayscale value calculated?+

Using the standard luminosity formula (0.299×red + 0.587×green + 0.114×blue), which weights each color channel by how the human eye perceives brightness — the same approach used by most photo-editing software.

Does this keep transparency?+

For PNG and WebP, yes — only the color channels are desaturated; the alpha (transparency) channel is untouched. JPEG has no transparency to begin with.

Is my image uploaded anywhere?+

No. Desaturation runs entirely in your browser using the Canvas API — nothing is sent to a server.

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