Black and White Converter
Black and White Converter — instantly, in your browser, with nothing uploaded.
Drag & drop your image here, or click to choose. Everything runs in your browser — nothing is uploaded.
This tool offers the two things people mean by "black and white": proper greyscale, which keeps every shade, and a pure two-tone conversion with an adjustable threshold, which is what you want for line art, signatures and stencils. Both run live in your browser.
Frequently Asked Questions
How do I use the black and white converter tool?
Drop your image onto the box above, adjust the controls, and the preview updates as you drag. When it looks right, choose PNG, JPG or WEBP and press Download. Nothing is uploaded at any point.
Are my files uploaded to a server?
No. The file is decoded and re-encoded directly in your browser using JavaScript and WebAssembly, and never leaves your device. That is what makes it safe for private photos, client work and anything confidential, and it is why the tool keeps working with your network disconnected once the page has loaded.
What is the difference between greyscale and pure black and white?
Greyscale keeps all 256 levels of brightness, so the photo still has depth and detail. Pure black and white forces every pixel to one extreme using a threshold you choose — useful for scanned text, logos and cutting machines, but it discards all shading.
Is there a limit or a watermark?
No limits, no watermark, no signup and no cost. Because the work happens on your own device there is no server bill to cover, so there is nothing to meter — the only real constraint is your device’s memory on very large files.
Does this work on Windows, Mac, iPhone and Android?
Yes. It runs in any modern browser on Windows, Mac, Linux, iPhone and Android with nothing to install and no account needed. Chrome, Edge, Firefox and Safari are all supported.