Threshold Image Online Free

Upload your image, then adjust the threshold slider from 0 to 255. Pixels brighter than the threshold become white, and darker pixels become black. The preview updates instantly, then you can download the result.

A threshold effect converts every pixel to either pure black or pure white based on brightness. Unlike grayscale, it removes all gray tones. This process is also called image thresholding or image binarization.

128 is the default balanced setting. Lower values (50-100) keep more white area — good for dark images. Higher values (150-200) keep more black — good for bright images. Adjust until the important details in your image are clearly visible.

No. A normal black and white filter often keeps gray tones. Threshold reduces the image to only two colors: pure black and pure white. Use threshold when you need a clean two-tone result for stencils, logos, scans, or graphic effects.

Yes. You can upload JPG, PNG, and WebP files. The tool processes the image locally in your browser and lets you download the thresholded result.

Yes. The tool is completely free with no signup or watermark. All threshold processing happens locally in your browser — your images are never uploaded to any server.

Threshold is useful for cleaning scanned documents, preparing logos for print, creating stencil art, making high-contrast comic effects, and separating foreground from background before OCR or design work.