Grayscale Image

Convert a photo to black & white, with an adjustable intensity slider. Runs entirely in your browser.

Convert an image to grayscale

Upload an image, then drag the slider to control how much color is removed. The preview updates instantly.

Drag & drop an image here, or click to browse
Supports JPG, PNG and WEBP.

    Preview

    Live preview
    Your image is processed locally in this browser tab using the Canvas API. It is never uploaded to Calcooo or any server.

    How to use this tool

    1. Drag and drop an image into the box above, or click to browse and select one.
    2. Drag the Grayscale intensity slider to control how much color remains. The preview updates live.
    3. Use Reset to return to full grayscale (100%) at any time.
    4. Click Download image to save the result.

    FAQ

    Frequently asked questions

    Is my image uploaded anywhere when I convert it to grayscale?

    No. The image is processed locally in your browser using the Canvas API. It never leaves your device.

    What does less than 100% grayscale intensity look like?

    It produces a partial desaturation — some of the original color remains blended with gray, which is useful for a subtle vintage look. At 100% the image is fully black and white.

    Does this change the file format?

    No. The downloaded image is exported in the same format as the original file you uploaded.

    Can I combine this with other adjustments?

    This tool only converts to grayscale. If you also want to change brightness, contrast or saturation, see the other Image Editing tools, or use Image Filters to adjust all of them together on one page.