# Black and White Threshold

Turn each pixel into black or white using luminance.

[Open this tool](https://whatson.pk/image-threshold-tool/)

Category: Image Preparation

A threshold image has only black and white pixels, unlike a grayscale photograph.

Adjust the luminance cutoff and inspect thin lines or small text.

## Inputs and controls

* One image or a batch: JPEG; PNG; WebP. Static images. Up to 4 MiB per file, 12 MiB total and 4 million pixels per image. At most six source images.
* Luminance cutoff. Allowed range: 0 to 255
* Download format: PNG, preserves alpha; JPEG, flattens alpha; WebP, server support needed
* Quality. Allowed range: 1 to 100

## How to use

* Choose a static JPEG, PNG or WebP source. Check the displayed upload limits before processing.

* Set Luminance cutoff, Download format and Quality. Review the selected units and options before preparing the output.

* Select Prepare image. Inspect the resulting preview, dimensions and file size, then download the output you need.


## Why use this tool

The cutoff makes the choice between dark and light pixels visible.


## Before relying on the result

Compare the finished picture with its source. Their luminance may fall on the white side of the selected cutoff. Review the threshold before accepting the output.

## Questions

### Why do faint strokes disappear?

Their luminance may fall on the white side of the selected cutoff. Review the threshold before accepting the output.

### What should I check before using Black and White Threshold?

Prepare a supported source image and check Luminance cutoff, Download format and Quality. Use the exact units shown beside the controls and replace any example values with your own inputs.

Source page last modified (UTC): 2026-10-04T18:22:34+00:00

This profile describes the tool. It does not execute it or supply a professional certification.