Image Grayscale Converter
Convert any image to grayscale instantly. Adjust brightness and contrast, then download the result. No server upload.
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Drop image here or click to select
Supports JPG, PNG, GIF, WebP
Frequently Asked Questions
How does grayscale conversion work?
Each pixel's RGB values are converted to a single luminance value using the formula: gray = 0.299×R + 0.587×G + 0.114×B. This formula matches human eye sensitivity to different colors.
Is my image uploaded to a server?
No. The conversion happens entirely in your browser using the Canvas API. Your image never leaves your device.
What image formats are supported?
JPG, PNG, GIF, WebP, and most other formats your browser supports. The output is downloaded as PNG.