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A browser-based digital square seal generator tool. No data sent to server.

📘 How to Use

  1. Enter the text to be engraved on the seal.
  2. Customize the font and border width using the controls.

Digital Square Seal Generator

Enter text to generate a digital square seal stamp

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Article

Digital Square Seal (Kaku-in) Generator｜Create Custom Japanese-Style Company Stamps

This online tool allows you to easily create a custom digital square seal, known as a "Kaku-in" (角印) in Japan. Generate a high-quality, transparent PNG image of a traditional Japanese-style company stamp for your documents, websites, or branding projects.

💡 Tool Overview

  • Real-time Customization: Instantly preview your seal as you type text, select a font (Mincho, Gothic, Rounded), and adjust the thickness of the border.
  • Automatic Text Layout: The tool intelligently arranges characters in the traditional top-to-bottom, right-to-left format, automatically adjusting the layout based on the number of characters.
  • High-Quality Transparent PNG: Download your seal as a 400x400 pixel PNG file with a transparent background, making it easy to overlay on any digital document or design.
  • Secure and Private: Your data is safe. All processing is done entirely within your browser. No text or generated images are sent to our servers.

🧐 Frequently Asked Questions

Q. What is a "Kaku-in" or square seal?

A. A Kaku-in is a square-shaped official seal used by companies and organizations in Japan and other East Asian countries. Unlike a personal signature, it is used to authorize general business documents like invoices, quotes, and internal forms, representing the authority of the organization itself.

Q. Can I use the generated image for official legal documents?

A. This tool is intended for design and digital representation purposes. A digitally generated image does not carry the same legal authority as a physically registered seal. The requirements for legally binding documents vary significantly by country and jurisdiction, so this image should not be used as a substitute for a formal, legally recognized seal or signature.

📚 Fun Facts about Japanese Seals (Hanko)

In Japan, seals (known as Hanko or Inkan) are widely used in place of signatures for everything from signing contracts to receiving parcels. There are several types:

  • Personal Seals: Individuals have registered seals (Jitsu-in) for major legal contracts, bank seals (Ginko-in) for financial transactions, and everyday unregistered seals (Mitome-in).
  • Corporate Seals: Companies use a set of seals. The most important is the "Representative Seal" (Daihyo-sha-in), which is registered with the government and is equivalent to a CEO's signature on major contracts. The "Square Seal" (Kaku-in), which this tool generates, serves as the company's general "stamp of approval" on less critical, day-to-day documents.

The traditional vermilion red ink (shuniku) used for stamping is not just for visibility; historically, the color was believed to have spiritual properties that ward off evil and signify authority.