Tiny Toolkit

Grayscale Image Tool

Convert any photo to grayscale instantly in your browser. Download the black and white result as a PNG.

All processing happens in your browser. No data is sent to any server.

Frequently Asked Questions

How does the grayscale conversion work?
The tool uses the browser's Canvas API with a CSS filter set to grayscale(100%). This applies the standard luminance-based conversion, weighting red, green, and blue channels according to human color perception (roughly 21% red, 72% green, 7% blue), which produces a natural-looking result.
What file format is the download?
The tool always downloads a PNG. PNG is lossless, so the grayscale values are preserved exactly. If you need a smaller file, you can convert the downloaded PNG to JPEG using an image converter.
Is my image uploaded to a server?
No. Processing happens entirely in your browser using the Canvas API. Your image never leaves your device.

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