Free Grayscale Image Converter
NewThis free tool turns photos black and white in your browser, one or a whole folder at a time, weighting the colours the way the eye reads them so the result does not go flat.
Drop your photos here
or paste with Ctrl+V. Add as many as you like — they all get the same treatment.
Runs entirely in your browser. Your images are never uploaded to a server.
How it works
- Drop your photos onto the box above, paste one with Ctrl+V, or choose them.
- They are converted straight away — there is nothing to configure.
- If you want a partly desaturated look rather than full black and white, pull the strength dial back.
- Name the output and apply, then download one file or the whole batch as a ZIP.
Common use cases
- Converting a set of photos to black and white for a consistent gallery.
- Turning a colour logo into a mono version for a single-colour print.
- Removing colour from a screenshot so an annotation stands out against it.
- Toning a background image down so text over it stays readable.
- Checking whether a design still reads when colour is taken away.
Frequently asked questions
- How do I make an image black and white?
- Drop it above. The conversion happens immediately and you can download it straight away — there is nothing to set up and no account. A whole folder works the same way as a single photo.
- What is the difference between grayscale and desaturating?
- Done well, nothing — both end up with no colour. Done badly, a lot. Averaging the red, green and blue channels is the naive way and it flattens the picture, because it treats a vivid green and a deep blue as equally bright when the eye sees them as nothing alike. This weights them the way the eye does, so the tonal range of the original survives.
- Why do my black and white photos look flat elsewhere?
- Almost always because the tool averaged the channels. Green carries about 71% of what we perceive as brightness, red 21% and blue 7%. Average them equally and every bright green turns mid-grey while every dark blue turns the same mid-grey — the contrast that made the photo work disappears.
- Can I make an image only partly grey?
- Yes. Pull the strength dial back and the colour is drained proportionally, so 40% leaves a muted version rather than a fully mono one. It is a good way to tone down a busy background without losing it entirely.
- Does converting to grayscale make the file smaller?
- Usually a little, because there is less colour information for the compressor to encode, but do not count on much — the file is still stored with three colour channels that happen to hold the same value. If size is the goal, compressing the image will do far more than removing its colour.
- Are my photos uploaded to a server?
- No. The conversion happens in your own browser using the Canvas API. The files never leave your device and nothing is stored.