Convert an Image to Grayscale

Convert a photo to black and white with adjustable intensity.

Image to Grayscale Converter

100% Private processing — your photos never leave your device

Click to upload or drag and drop imageSupports JPG, PNG, WebP, GIF, BMP

Ad Space (auto) — Configurable via NEXT_PUBLIC_ADSENSE_CLIENT

What does Image to Grayscale Converter do?

Convert any image to grayscale using luminance-weighted conversion, which preserves perceived brightness far better than a naive channel average. A slider lets you blend partway between colour and monochrome.

How to Use Image to Grayscale Converter

1
Add an imageAny format your browser can decode.
2
Adjust the intensity100% is fully monochrome; lower values keep some colour.
3
DownloadThe conversion is baked into the exported file.

Key Features

Luminance-weighted conversion that keeps perceived brightness correct
Intensity slider for partial desaturation
Optional sepia tone
Side-by-side comparison with the original
Full original resolution preserved

Frequently Asked Questions

How is grayscale calculated?

Using the luminance weights 0.2126 red, 0.7152 green and 0.0722 blue, which reflect how sensitive human vision is to each channel. Simply averaging the three channels makes greens too dark and blues too light.

Does grayscale reduce file size?

Somewhat, because there is less colour information to encode — usually 10–30% for JPEG. A true single-channel grayscale PNG saves more, but browser canvas encoders always output three channels.

Can I get a partial desaturation effect?

Yes. Set the intensity below 100% and the result blends between the original and full grayscale, which is the standard way to mute colours without losing them entirely.

Why does my black and white photo look flat?

Removing colour removes one of the ways an image separates its subject from the background. Raising contrast usually restores the punch — use the brightness and contrast tool after converting.

100% Data Privacy

Your image is read straight from your device by the browser and processed on a canvas in this page. It is never uploaded, stored or sent anywhere — you can disconnect from the internet after the page loads and the tool still works.