Images

Image grayscale converter

Convert images to greyscale. Luminosity, high contrast, or flat method. Drag-to-reveal comparison.

Drop image here or click to browse

JPG, PNG, WebP

100% private. All processing happens locally in your browser — no files or data are ever sent to a server.

How to use Image grayscale converter

01 Drag and drop your image onto the upload area, or click to browse files
02 Adjust the settings using the controls below the preview
03 Click Download to save the processed image to your device

Frequently asked questions

Common questions about Image grayscale converter.

Is Image grayscale converter free to use?

Yes, Image grayscale converter is completely free. No account, subscription, or payment is ever required — just open the page and start using it.

Does Image grayscale converter upload my data to a server?

No. Image grayscale converter runs entirely in your web browser using client-side JavaScript. Your files, text, and data never leave your device, making it 100% private.

Can I use Image grayscale converter on my phone or tablet?

Yes. Image grayscale converter is fully responsive and works on all modern smartphones, tablets, and desktop browsers without installing any app.

What image formats does Image grayscale converter support?

Image grayscale converter supports JPEG, PNG, and WebP formats. All processing uses your browser's built-in Canvas API — no plugins required.

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About Image grayscale converter

The Image Grayscale Converter turns colour images into black and white with three conversion methods: Luminosity (weighted average for accurate human perception), High contrast (boosted shadows and highlights), and Flat (simple RGB average). An intensity slider blends the original with the greyscale result from 0% to 100%. A drag-to-reveal comparison lets you see before and after side by side. Export at full original resolution. All processing happens in your browser using the Canvas API.