Stamp Maker

How to use

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. 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. Select ink color

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

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. 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.

Scope of the result

One image file at a time, up to 50 MiB, and only MIME types beginning with image/. Output is always PNG so transparency survives. Thresholding leaves no midtones; gradation is only approximated when you turn on error-diffusion dithering. Files are not uploaded.

Frequently asked questions

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.