Convert Images to Grayscale Online
Converting an image to grayscale removes all colour information, producing a black-and-white version that emphasises contrast, texture, and form. Grayscale images are used in photography for artistic effect, in print workflows to reduce ink costs, in document scanning, and in machine learning as a preprocessing step. This tool converts any PNG, JPEG, or WebP image to grayscale directly in your browser using a luminosity-weighted conversion that preserves perceived brightness accurately. The result can be downloaded as a PNG or JPEG.
FAQ
- How is colour converted to grayscale?
- The tool uses luminosity weighting (approximately 21% red, 72% green, 7% blue) to calculate the perceived brightness of each pixel. This preserves perceived contrast better than simply averaging the RGB channels.
- Can I convert part of an image to grayscale?
- This tool converts the entire image. For selective grayscale effects, use a full image editor like Photoshop or GIMP.
- What is the difference between grayscale and black-and-white?
- Grayscale images have a continuous range of grey tones between black and white. True black-and-white (monochrome) images contain only pure black and pure white pixels, with no grey tones.