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Jpg to grayscale converter

World's simplest jpg tool

A simple browser-based Joint Photographic Experts Group photo grayscaler. Just paste your JPEG picture in the input area and you will instantly get a grayscale version of this JPEG. Fast, free, and without ads. Import a color JPG photo, get a grayscale JPG photo. Created by mad scientists for mad scientists.
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JPEG Grayscale Formula
Take 0.21Red + 0.72Green + 0.07Blue. (Also known as ITU-R BT-709 formula.)
Take 0.30Red + 0.59Green + 0.11Blue. (Also known as ITU-R BT-601 formula.)
Take 1/3 of each color component. (1/3Red + 1/3Green + 1/3Blue)
Custom Grayscale Formula
Uses custom weights for red, green and blue. <formula>
Red intensity.
Green intensity.
Blue intensity.
Jpg to grayscale converter tool What is a jpg to grayscale converter?
This tool removes all color from JPG pictures. The output is a grayscale version of the JPEG. There are many different ways to convert RGB color components to grayscale and this tool supports four ways to do it. You can use one of three grayscale formulas that are used in HDTV, Pal/Ntsc systems, or using average component formula, or you can define your own custom grayscale formula.
Jpg to grayscale converter examples Click to use
Turn a JPG image grayscale with BT-709 formula
This example converts a JPEG photo of hills to grayscale by using HDTV (ITU-R BT-709) formula.
Required options
These options will be used automatically if you select this example.
Take 0.21Red + 0.72Green + 0.07Blue. (Also known as ITU-R BT-709 formula.)
Uses custom weights for red, green and blue.
Grayscale a JPEG photo using custom weights
This example drops all color from a JPG picture by applying custom weights to conversion process. It extracts Red, Green and Blue in equal parts. The formula becomes (Red+Green+Blue)%255.
Required options
These options will be used automatically if you select this example.
Uses custom weights for red, green and blue.
Red intensity.
Green intensity.
Blue intensity.
Use only red channel for converting JPG to grayscale
Custom weights used in this example ignore green and blue colors but sets red to maximum. As a result only the red channel controls the amount of gray in the example JPEG graphics file.
Required options
These options will be used automatically if you select this example.
Uses custom weights for red, green and blue.
Red intensity.
Green intensity.
Blue intensity.
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