Image & Photo
Grayscale image
Convert an image to grayscale (black and white), then download it as PNG.
- Instant
- Free
- Private (processed locally)
- No sign-up
Convert an image to black and white
Import a photo: the tool turns it into grayscale with a natural result, then you download it as PNG. Ideal for documents, printing or a retro style.
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Load the image
Drag & drop or click.
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Instant preview
In grayscale.
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Download
PNG export.
Why luminance?
- Formula 0.299 R + 0.587 G + 0.114 B
- Result faithful to the human eye
- Green weighs most, blue least
- Transparency preserved
Example
| Color | Resulting gray |
|---|---|
| Pure red (255,0,0) | 76 |
| Pure green (0,255,0) | 150 |
| Pure blue (0,0,255) | 29 |
100% local processing via canvas: your image never leaves your device.
Frequently asked questions
How is the gray computed?
Each pixel becomes gray = 0.299×R + 0.587×G + 0.114×B (perceived luminance, Rec. 601), for a result faithful to human perception.
Which formats are accepted?
JPG, PNG, WebP, GIF (first frame) and most browser-displayable images. The result is exported as PNG.
Is transparency preserved?
Yes: only the color channels are desaturated, the alpha (transparency) channel is kept.
Is my image uploaded?
No. The conversion happens locally on a canvas; your file never leaves your device.