Black and White Threshold
Convert an image to pure black and white with a brightness threshold.
Drop your image here
Drag and drop, or choose a file below
JPG · PNG · WEBP
Up to 250 MB · One image at a time
Each image: up to 16 megapixels and 8192 px per side
Turns estimated brightness into pure black or white; alpha is preserved.
Exports a full-resolution PNG with transparency. PNG files can be larger than the original.
Original
Choose an image or try the sample to see your preview here.
100% local processing
How to use
- 01
Choose an image or try the local sample.
- 02
Adjust the 0–255 threshold and optionally reverse light and dark.
- 03
Process, inspect the preview and download PNG.
Details and tips
How it works
A weighted RGB brightness estimate assigns each pixel to black or white. Alpha is retained, so existing transparent and translucent areas stay available in the PNG.
Made for everyday images
Prepare bold line art, high-contrast masks and monochrome graphic experiments.
Frequently asked questions
Are images uploaded?
No. Processing and export happen on your device. Images are not saved to an account.
What are the limits?
Input supports JPG, PNG and WebP, up to 250 MB, 8192 px per side and 16 million pixels. Expanded output must also fit the pixel limits. Animated input is processed as a still frame.