How to Use the Posterize Image Tool
1. Upload an image
Drag and drop an image into the “Upload Image” area, or click “Choose Image” to select a file. You can also paste an image copied to your clipboard.
PNG, JPG, JPEG, and WebP images are supported, with a maximum file size of 50MB.
A sample image is displayed by default, so you can try the settings and see the posterize effect without uploading your own image.
2. Choose a color mode
Under “Color Mode,” select “Color” or “Grayscale.”
- Color: Reduces color levels while retaining the original colors, creating distinct areas of color for a poster-like effect.
- Grayscale: Converts the image into shades of black, white, and gray for a look similar to a monochrome print or poster.
3. Adjust the levels
Use the “Levels” slider or the number field to its right to change the number of levels. The default is 5.
Fewer levels divide color changes into larger steps, creating a bold, flat appearance. More levels retain finer color variations, producing a more natural result closer to the original image.
4. Adjust the advanced settings if needed
“Advanced Settings” lets you further adjust the appearance of the posterized image.
- Contrast: Adjusts the difference between light and dark areas.
- Brightness: Adjusts the overall brightness of the image.
- Saturation: Adjusts the intensity of the colors.
- Hue: Changes the image’s color tones.
Click “Clear” to the right of a setting to restore that setting to its default value.
5. Check the preview
Your settings are reflected in the preview on the right in real time. Adjust the settings while checking the preview until you get the result you want.
Use “Before” and “After” at the top right of the preview to compare the original and processed images.
6. Set the output dimensions
Under “Output Image Settings,” specify the “Width” and “Height” of the saved image in pixels.
When “Lock aspect ratio” is enabled, you can change the size while preserving the original image’s proportions.
You can also disable it and set the width and height independently, but the image will stretch or compress to fit those dimensions.
7. Download as a PNG
Once you have checked the result and output dimensions, click “Download PNG.” The processed image is saved in PNG format.
Click “Reset” if you want to start over.
What Is Posterization?
Posterization is an image processing technique that reduces smooth variations in color or brightness to a smaller number of distinct levels.
In an ordinary photo, color gradients and transitions between light and shadow change gradually. Posterization divides these transitions into visible steps, creating clearly defined areas of color.
It is useful for creating bold colors like those in posters and printed artwork, illustration-style effects, and retro graphics.
(This tool reduces the image’s color levels. It does not use AI to redraw a photo as a hand-drawn illustration.)
What are levels?
“Levels” specifies how many steps are used to represent color or brightness.
In Color mode, the brightness of each red, green, and blue (RGB) channel is reduced to the selected number of levels. For example, with 5 levels, each channel can have up to 5 values, allowing a theoretical maximum of 125 color combinations (5×5×5). It does not mean the entire image will use only 5 colors.
In Grayscale mode, levels specifies the number of brightness steps, including black and white. With 5 levels, the image uses up to 5 shades of gray.
The actual number of colors or brightness levels used may be lower, depending on the original image and adjustment settings.
Posterization vs. dithering
Posterization and dithering both work with a limited range of levels or colors, but they create different effects.
Posterization reduces levels to emphasize abrupt color transitions. It works well for large areas of flat color and effects resembling posters or prints.
Dithering arranges pixels of different colors to simulate intermediate tones with fewer colors. It is useful for creating grainy patterns or a retro video game look.
Choose posterization for clearly defined color boundaries, or dithering to add a dotted or grainy appearance.
FAQ
Does this tool use AI to turn photos into illustrations?
No. It reduces the image’s color levels. It does not use AI to redraw subjects or generate illustrations.
Which image formats are supported?
You can upload PNG, JPG, JPEG, and WebP images. The maximum file size is 50MB.
Can I create a black-and-white posterized image?
Yes. Select “Grayscale” under “Color Mode” to posterize the image using shades of black, white, and gray.
Can I adjust contrast, brightness, saturation, and hue?
Yes. Click “Advanced Settings” to display the contrast, brightness, saturation, and hue controls.
Can I change the size of the saved image?
Yes. Set the width and height under “Output Image Settings.” Enable “Lock aspect ratio” to resize the image while preserving its proportions.
Can I save the result as a JPG or WebP?
This tool outputs PNG images. Even if you upload a JPG, JPEG, or WebP image, the processed result is downloaded in PNG format.
Are uploaded images stored on a server?
No. Images are processed in your browser and are never sent to or stored on a server.
Can I use the processed images commercially?
You can use this tool for both personal and commercial purposes. You do not need to link to this site or provide credit when using the processed images.
However, images you upload remain subject to the original image’s copyright and usage terms.
