Average uses (R+G+B)/3 for simple conversion. Luminosity (recommended) uses weighted values based on human perception, giving more natural results. Desaturate removes color saturation while preserving luminance.

Luminosity (BT.709) produces the most natural-looking grayscale because it weights colors based on human eye sensitivity: green contributes most, then red, then blue.

Yes. Use the contrast slider to enhance or reduce tonal range. Increasing contrast makes darks darker and lights lighter for more dramatic black and white photos.

Upload JPG, PNG, WebP, GIF, BMP, or TIFF. Download as PNG (lossless) or JPG (smaller file size). The tool processes any browser-supported image format.

Yes. Select or drag multiple files. All images are converted with the same settings. Download individually or as a ZIP archive.

True grayscale conversion produces smaller file sizes and ensures consistent rendering across all devices. Color filters may display differently on various screens.

Yes, typically. Grayscale images contain less color data, resulting in smaller files especially for PNG format. JPG compression also works more efficiently on grayscale.

Yes. See the grayscale result instantly as you adjust settings. Compare with the original by toggling the preview. Download only when satisfied.

Yes. All conversion happens in your browser using Canvas API. Your images never leave your device. Complete privacy guaranteed.

Use PNG for maximum quality and sharp edges. Use JPG (quality 85-95) for smaller files when sharing online. Both preserve the grayscale conversion perfectly.