Grayscale Converter — Turn Images to Black & White Online
Free online grayscale converter to turn your images into black and white. Choose from multiple grayscale algorithms including luminosity, average, and desaturation. Adjust contrast and brightness for the perfect monochrome effect — 100% client-side.
Click or drag & drop an image
JPG, PNG, WebP, GIF · Processed locally
Your image never leaves your device.
How to Use Grayscale Converter
Upload an Image
Drag and drop an image or click to browse from your device.
Choose Conversion Method
Select from Luminance, Average, Lightness, or Intensity algorithms.
Fine-Tune the Look
Adjust contrast and brightness for the perfect monochrome effect.
Apply and Download
Click Convert to Grayscale, compare with the original, then download.
FAQ
Luminance weights colors by human perception, Average takes a simple mean, Lightness uses the midpoint of RGB extremes, and Intensity uses a fixed weighted formula.
Yes. Use the sliders to fine-tune contrast and brightness before converting.
Yes. We support JPG, PNG, WebP, GIF, and other common formats.
Yes. Your image never leaves your device — all processing is done in your browser.
Yes. You can choose the output format and quality before downloading.
The Luminance method is generally best for photos as it accounts for how humans perceive brightness.
Try an Example
Luminance Grayscale
Convert a color portrait to a classic black and white photo using the Luminance method.
Method: Luminance · Contrast: +15
A natural-looking black and white photo that preserves human-perceived brightness.
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