Grayscale Converter
Image ToolsConvert a color image to black and white.
What is Grayscale Converter?
Grayscale Converter strips the color from any photo and turns it into a clean black-and-white image. Choose a perceptual luminance conversion that matches how your eye reads brightness, or a simple channel average, and see the result update live. Drop in a PNG, JPEG, or WebP and download a lossless PNG — everything runs in your browser, so your image is never uploaded.
How to use Grayscale Converter
Add your image
Drag a PNG, JPEG, or WebP onto the drop zone, or click to browse. It loads at full resolution and is decoded locally.
Pick a conversion method
Luminance weights the green channel highest (0.299R + 0.587G + 0.114B) to match human vision, giving natural-looking tones. Average treats red, green, and blue equally for a flatter, simpler result.
Preview the black-and-white result
The tool recomputes every pixel and shows the grayscale image immediately. Switch methods any time to compare which looks better for your photo.
Download the PNG
Click Download PNG to save the grayscale image, named after your original file with a -grayscale suffix.
Common uses
- Convert a photo to black and white for a classic look
- Prepare an image for grayscale or monochrome printing
- Remove distracting color to focus on shapes and contrast
- Create a neutral background image behind text
- Standardize product photos to a consistent monochrome style
- Reduce an image to luminance before further editing
Why choose FreeTools
100% private
Your files are processed inside your browser and are never uploaded to a server.
Free, no account
No sign-up, no watermark, no paywalled “premium” tier. Just open a tool and use it.
Instant
No upload, no queue, no server round-trip — work starts the moment you drop a file.
Runs in your browser
Built on open web standards. Works on any modern desktop browser, nothing to install.
No upload size caps
Nothing leaves your device, so there’s no server file-size limit — only your machine’s memory.
Yours to keep
Results download straight to your device in clean, standard file formats.