OneImageTool

Free Image Tools

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BLACK & WHITE

Grayscale Image

Upload a JPG, PNG or WebP and convert to black and white instantly with a live preview.

BLACK & WHITE

☞ runs entirely in your browser — nothing is uploaded

Drop your image here

or click to browse — JPG, PNG, WebP

black and white

Convert photos to grayscale online

Remove color for classic monochrome looks, print prep, or stylistic social posts — one upload, instant preview.

For more looks try Photo Filters, or use Adjust Saturation at 0% for manual control.

three steps

How to make an image grayscale

01

Upload

Choose a color JPG, PNG or WebP.

02

Preview

The tool converts to luminance-based grayscale automatically.

03

Download

Save as JPG, WebP or PNG.

quick answers

Grayscale FAQ

How is grayscale calculated?

Standard luminance weights (0.299R + 0.587G + 0.114B) — the same approach as most editors.

Are files uploaded?

No. Conversion runs in Canvas locally.

Can I adjust contrast after?

Use Adjust Brightness or Photo Filters for further edits.

Is this free?

Yes — free, no watermark.

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