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image to grayscale converter

world's simplest image tool

Free online grayscale image creator. Just drag and drop your color image here and it will be automatically converted to a grayscale image. You can choose between the three most popular grayscale conversion methods or create a custom method by setting the intensities of the red, green, and blue color channels. Created by engineers from team Browserling.

᠎᠎᠎          Tool Options

Grayscale Conversion Algorithm

Convert an image to grayscale
by averaging red, green, and
blue color channels.
(Red/3+Green/3+Blue/3)
Convert an image to grayscale
by using HDTV method.
(0.21×Red + 0.72×Green + 0.07×Blue)
Convert an image to grayscale
by using PAL/NTSC method.
(0.30×Red + 0.59×Green + 0.11×Blue)

Custom Grayscale Weights

Check this to use custom
grayscale conversion weights.
{formula}
Red color coefficient.
Green color coefficient.
Blue color coefficient.

Color Limitation

Use a smaller number of
gray shades to draw
the grayscale image.
Set the number of colors in the
grayscale image (maximum 256).

Grayscale Image Format

Format of the output
grayscale image.

What is a image to grayscale converter?

This tool converts color images into grayscale images. As you may know, all colors that you see in images are actually made out of just three primary colors – red, green, and blue. By combining various amounts of these three colors together, we get images of all possible colors. These three colors are stored in three separate color channels, called the red color channel, the green color channel, and the blue color channel. To create a grayscale image, the tool removes information about how much color is in each of these channels and leaves only information about the amount of light in these channels. As the information about the amount of color is lost, we obtain a grayscale or a black-and-white image. There are also multiple methods for removing the color information from an image. This tool provides the three most popular grayscale conversion formulas as well as gives you the freedom to create a custom formula. Among the most popular conversion formulas is the "Average Color Values" formula, which takes equal amounts of red, green, and blue channels and calculates their average value as "Red/3 + Green/3 + Blue/3" for the amount of light left in the image. The second method is called the "ITU-R BT.709 Formula" (also known as HDTV formula), which applies different weights to the color channels according to the formula "0.21×Red + 0.72×Green + 0.07×Blue", and the third method, known as the "ITU-R BT.601 Formula" (also known as PAL/NTSC formula) utilizes the formula "0.30×Red + 0.59×Green + 0.11×Blue". If you select the "User-defined Weights" option, then you can also create your own custom conversion formula by manually entering the weights that determine how much light is extracted from each color channel. By default, the maximum number of colors (256) are used in the output grayscale image. However, you can also create an image with fewer shades in this program. By using the "Limit Color Shades" option, you can set an arbitrary color limit. For example, you can make the image consist of only 20, 10, or even just 2 shades of gray. Image-abulous!


Image to grayscale converter examples

Click to try

Grayscale an Image Using a Preset Formula

This example grayscales an image of an adorable doggo. To accomplish this task, it utilizes a math formula from the ITU-R BT.709 standard to convert the colors to grayscale tones. (Source: Pexels.)

Required options
These options will be used automatically if you select this example.
Convert an image to grayscale
by using HDTV method.
(0.21×Red + 0.72×Green + 0.07×Blue)
Check this to use custom
grayscale conversion weights.
{formula}
Use a smaller number of
gray shades to draw
the grayscale image.

Convert an Image to Grayscale Using Custom Weights

This example turns the same image of a doggy into its black-and-white version by applying custom grayscale weights to individual color channels. It sets the coefficients for the red, green, and blue channels equal by assigning them the value "1". As a result, the background in the output image becomes barely visible. (Source: Pexels.)

Required options
These options will be used automatically if you select this example.
Check this to use custom
grayscale conversion weights.
{formula}
Red color coefficient.
Green color coefficient.
Blue color coefficient.
Use a smaller number of
gray shades to draw
the grayscale image.

Create a Graphics Effect with Color Reduction

In this example, we create a six-shade grayscale image of a train in snowy mountains. Such a significant reduction of color space creates the effect of an artificially crafted image rather than a real photograph. Even though just six colors are left, the details in the image are still preserved and it's actually quite difficult to immediately see that the color palette was reduced. The six different grays effectively convey the original image's depth and textures, from the electric lines to the snowy patches in the mountainous backdrop. (Source: Pexels.)

Required options
These options will be used automatically if you select this example.
Convert an image to grayscale
by using PAL/NTSC method.
(0.30×Red + 0.59×Green + 0.11×Blue)
Check this to use custom
grayscale conversion weights.
{formula}
Use a smaller number of
gray shades to draw
the grayscale image.
Set the number of colors in the
grayscale image (maximum 256).

Extract Light from the Blue Color Channel

In this example, the weights of the red and green color channels are set to zero, while the blue channel's weight is set to one. As a result, the converter discards the red and green channels and extracts the light information from the blue channel only. In the output image, you can see that the red and green channels are now black because they contain no light information but the blue channel is white because all the light is in it.

Required options
These options will be used automatically if you select this example.
Check this to use custom
grayscale conversion weights.
{formula}
Red color coefficient.
Green color coefficient.
Blue color coefficient.
Use a smaller number of
gray shades to draw
the grayscale image.

Twelve-Color Grayscale Image

This example generates a grayscale image with a limited color palette. Instead of the standard 256 shades, it uses only 12 and applies the average color conversion algorithm, where one-third of each color is mixed together to form a gray tone. In the input image, we see a vivid red gerbera daisy held by a hand against a light blue background. The flower's petals are rich in color, displaying various shades of red and pink. In the output image, each gray tone becomes distinctly visible as there are only twelve distinct shades of gray left. (Source: Pexels.)

Required options
These options will be used automatically if you select this example.
Convert an image to grayscale
by averaging red, green, and
blue color channels.
(Red/3+Green/3+Blue/3)
Check this to use custom
grayscale conversion weights.
{formula}
Use a smaller number of
gray shades to draw
the grayscale image.
Set the number of colors in the
grayscale image (maximum 256).

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