Black & White Threshold
Convert an image to pure black and white (1-bit) with an adjustable threshold — great for stencils and scans. Free.
✓ 100% free ✓ No sign up ✓ Runs in your browser — nothing uploaded
How to use Black & White Threshold
- 1Drop one or more images into the box above.
- 2Adjust the settings — the preview updates live.
- 3Click “Download” to save, or apply to all images as a ZIP.
Questions
Is Black & White Threshold free?
Yes. Black & White Threshold is 100% free with no limits, no watermark, no sign up and no email required.
Are my files uploaded to a server?
No. Your files are processed entirely inside your browser using JavaScript. They never leave your device, so it is private and works even on slow connections.
Does Black & White Threshold work on my phone?
Yes. Black & White Threshold works in any modern browser on iPhone, Android, Windows, Mac, Linux and Chromebook. No app or install needed.
Do I need to create an account?
Never. There is no sign up, no login, no email and no paywall. Just open the page and use it.