Image Grayscale
Convert an image to greyscale.
◑Image Grayscale
All processing happens locallyWhat this tool does
Image Grayscale is a Image Grayscale that returns results as soon as you pick a file; nothing leaves your machine., the image is processed entirely inside your browser and never uploaded anywhere, so your files stay private.
Download the result directly; multiple images are handled in turn and offered as a zip or one by one.
How to use it
- Paste or type your content into the input field at the top, or press the sample button to load demo data.
- Adjust the options below the input, such as output format, separators, letter case or precision.
- Press the main button to run the conversion. Results appear instantly in the output panel without a page reload.
- When the result looks right, use the copy button in the corner, or download it as a local file.
Tips and notes
Clean up stray spaces and line breaks before pasting for more accurate results.
FAQ
Standard luminance weighting: 0.299R + 0.587G + 0.114B, matching the eye’s greater sensitivity to green and looking more natural than a plain average.
Desaturation is the common name for greyscaling. This tool also offers an average method and adjustable contrast for finer control.
Slightly, since colour variation drops. Storage is still three channels but compresses better.
Yes. The tool is completely free with no usage limits, and you never need an account or a sign-in.
No. All processing runs locally in your browser, so the input never reaches a server and is never logged or stored.
Yes. The layout is mobile-first, so inputs and buttons stay comfortable on phones and tablets in both orientations.
Yes. A copy button in the output panel puts the result on your clipboard, and you can also download it as a text file.