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Stamp Maker

Free online tool to convert images into stamp-style images like ink stamps or seals. Supports binary thresholding and dithering with customizable ink colors.

Upload an image to convert it into a stamp-style image that looks like an ink stamp or seal. Choose between binary thresholding and dithering modes, and customize the ink color. All processing happens in your browser—images are never uploaded to a server.

1. Upload Image

2. Stamp Settings

128

Brightness threshold (0-255). Pixels darker than this value will be colored with ink.

#ef4444

Enable dithering to represent gradients more smoothly.

3. Preview

3. Preview

Select or drag & drop image

common.howTo

  1. 1

    Upload an image

    Upload the image you want to convert into a stamp. Click the file selection button or drag and drop an image.

  2. 2

    Adjust the threshold

    Use the slider to adjust the threshold. Pixels darker than the threshold will be colored with ink, while lighter pixels become transparent. Adjust while viewing the preview.

  3. 3

    Select ink color

    Choose from preset colors (red ink, blue ink, black ink) or select any color using the color picker.

  4. 4

    Configure dithering

    Enable dithering to use the Floyd-Steinberg error diffusion algorithm for smoother gradient representation. This is effective for images with many tones, such as photographs.

  5. 5

    Download the image

    Review the preview and click the download button to save the image in PNG format. Transparency is preserved, so you can overlay it on other images.

common.faq

Are images uploaded to a server?
No, all processing is done entirely in your browser. Images are never sent to a server and remain completely private.
What image formats are supported?
Any image format supported by your browser, including JPEG, PNG, GIF, and WebP. The output is in PNG format to preserve transparency.
What is dithering?
Dithering is a technique for representing gradients with a limited color palette. The Floyd-Steinberg error diffusion algorithm allows smooth gradients to be represented using only two colors (black and white). It's suitable for images with many tones, such as photographs.
Can I use this for commercial purposes?
Yes, this tool is free for commercial use. You can freely use the generated images.