Grayscale Converter
Convert color photos to black and white, or partially desaturate — no upload.
Examples
Full black and white
Input
Colour portrait JPEG
Output
Classic black-and-white photo at intensity 100%
Muted colour
Input
Vibrant landscape PNG
Output
Desaturated, faded look at intensity 60%
About this tool
This free online grayscale image converter turns colour photos into black and white in your browser — nothing is uploaded. Drag the Intensity slider to control how much desaturation to apply: 100% for a full monochrome result, or lower values for a muted, partially desaturated look. The output preserves your original format and shows the file size so you can download with confidence.
How to use
- Drop a JPG, PNG, or WebP image into the upload zone.
- Adjust the Intensity slider (0–100%) — 100% is fully black and white.
- Click Apply to process the image.
- Preview the result and check the output file size.
- Click Download to save your grayscale image.
Frequently asked questions
How do I convert a photo to black and white online?
Drop your image into this tool, set the intensity to 100%, and click Apply. The grayscale conversion runs in your browser — no upload, free, instant.
Is the grayscale converter free to use?
Yes — completely free with no sign-up. Your image is processed locally in your browser and never uploaded anywhere.
What does the intensity slider do?
At 100% the image is fully black and white. Lower values blend the grayscale version with the original colour, letting you create a muted or desaturated look rather than a full monochrome.
Which image formats are supported?
JPG, PNG, and WebP. The output keeps the same format as the input — JPEG for JPG files, PNG for everything else.
Will the black-and-white image look different from what my phone produces?
This tool uses the standard luminance weights (the same ones used by browsers and CSS), which produce natural-looking results. Some phone apps apply extra tone curves or grain for a film look.
Can I use this to desaturate a colour image partially?
Yes. Lower the Intensity slider below 100% to blend the grayscale result with the original colour. At 50% you get a half-desaturated, muted look.
Does converting to grayscale reduce the file size?
Often yes, because monochrome images compress more efficiently. The output file size is shown after processing.
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