One image or a batch
Source images
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.
Black and White Threshold
Turn each pixel into black or white using luminance.
Open this toolA 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
Luminance cutoff
Tool inputs
Allowed range: 0 to 255
Download format
Tool inputs
PNG, preserves alpha, JPEG, flattens alpha, WebP, server support needed
Quality
Tool inputs
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: 2026-10-04T18:22:34+00:00. This profile describes the tool; use its page to run it.
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