Threshold Image Online Free — Black & White Threshold Effect

Upload your image, then adjust the threshold slider (0-255). Pixels brighter than the threshold become white, darker pixels become black. The preview updates instantly. Download the result as PNG when you're happy with it.

Threshold converts every pixel to either pure black or pure white based on its brightness. Unlike grayscale which preserves gray tones, threshold produces only two colors. This is also called 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.

Grayscale converts colors to shades of gray (256 levels from black to white). Threshold goes further — it reduces to only 2 levels: pure black and pure white, with no gray at all. Use grayscale for tonal photos, threshold for high-contrast graphic effects.

Yes. The threshold image tool supports JPG, PNG, and WEBP input. Output is saved as PNG to preserve the clean black and white result without compression artifacts.

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 ideal for cleaning up scanned documents, preparing logos for print, creating stencil art, making high-contrast comic effects, and preprocessing images for OCR text recognition.

The threshold effect converts your photo to only two colors — pure black and pure white. Every pixel is evaluated: if its brightness is above the threshold level, it becomes white; below it, black. This creates a dramatic, high-contrast look. You can threshold any pic or photo with our free online tool — just upload and adjust the slider.

Image thresholding (also called thresholding in image processing) is a technique that segments an image into foreground and background by converting it to binary — black and white only. Our online image thresholding tool makes this simple: upload an image, set the threshold, and download the result. No coding or Photoshop needed.

A black and white filter preserves gray tones — your image keeps smooth gradients from dark to light. Threshold eliminates all gray: every pixel becomes either pure black or pure white with no in-between. Use threshold when you want a clean two-tone result with no grey, like for stencils, logos, or scanned documents. For gray-tone results, try our black and white filter tool.