Grayscale Converter
Convert color photos and images to beautiful grayscale instantly. Uses luminance-weighted conversion for natural-looking black and white results.
100% Private & Secure
Your images are processed locally in your browser and never sent to our servers. No account needed.
How to Use
- 1
Upload your image.
- 2
The conversion to grayscale happens automatically.
- 3
Compare original and result, then download.
Frequently Asked Questions
What algorithm is used for grayscale?
We use the standard luminance formula: 0.299R + 0.587G + 0.114B — this matches how the human eye perceives brightness.
Can I adjust contrast after converting?
This tool converts to grayscale only. For contrast adjustment, use an image editor after downloading.
Does grayscale conversion reduce file size?
The output format is the same as input. File size may decrease slightly for JPEG due to reduced color complexity.
What formats are supported?
JPG, PNG, WebP. The output format matches the input.
Is the original image preserved?
Yes. The original file is never modified — only the downloaded output is grayscale.