Digital Stamp Generator
A free tool for generating digital stamps (hanko) for remote work and document approval. Choose round or square seal styles with customizable size and color. Download as transparent PNG for direct insertion into Word, Excel, and PDF. All processing is done in your browser.
What You Can Do
The Digital Stamp Generator creates customizable digital stamps (hanko) for remote work and document approval. Choose round or square seal styles with size and color customization. All processing is done in your browser, and no data is sent to external servers.
- ✅ Round and Square Seals: Choose the seal style based on your needs
- ✅ Size & Color Customization: Adjust size from 150-500px and choose from vermillion, black, and more
- ✅ Transparent PNG Output: Direct insertion into Word, Excel, and PDF for immediate use in documents
Free digital stamp (hanko) generator for remote work and document approval. Choose between round and square seals, customize size and color. Download as transparent PNG for Word, Excel, and PDF.
* Enter the name to appear on the stamp
Preview
Enter a name and click "Generate Stamp" to create
💡 Use Cases
- Document approval and signatures for remote work
- Inserting stamps into PDF documents
- Quick approval marks in emails or chat
- Business documents like invoices and quotations
- Internal application forms and approvals
📖 How to Use
Enter Name
Enter the name (1-4 characters) to display on the stamp.
Choose Style
Select round or square seal, adjust size and color. Preview updates in real-time.
Generate and Download
Click "Generate Stamp", review the preview, then click "Download" to save.
Insert into Documents
Use the transparent PNG in Word, Excel, PDF, and other applications.
⚖️ Legal Validity of Digital Stamps
About Digital Stamps and Legal Effect
Digital stamps generated by ToolMarche are <strong>image files (PNG format)</strong> and do not carry the legal force of official seals or digital signatures. Under Japanese Electronic Signature Law, "digital signature" requires cryptographic authentication technology, which simple stamp images do not meet.
Official Contracts Require Registered Seals or Digital Signatures
For formal contracts such as real estate transactions, loan agreements, and company incorporation, legally registered <strong>official seals</strong> with <strong>seal certificates</strong> or certified <strong>digital signatures</strong> are required. Digital stamps from this tool do not meet these requirements.
Recommended Uses
- Internal Documents: Company approvals and internal workflows
- Invoices & Quotations: Business correspondence
- Internal Applications: Leave requests, expense reports, etc.
- Remote Work Approval: Quick confirmations in remote environments
🔍 Digital Stamps vs. Official Seals
In Japan, there are multiple types of seals with different purposes and legal effects. Please refer to the table below.
| Type | Description | Legal Effect |
|---|---|---|
| Registered Seal (Jitsuin) | Officially registered with local government. One per person. | High (legal evidence) |
| Personal Seal (Mitomein) | Standard seals. No registration required. | Medium (personal verification) |
| Company Seal (Kakuin) | Square company stamp used by organizations. | Medium (company verification) |
| Digital Signature | Cryptographic signature issued by certified providers. | High (legal force) |
| Digital Stamp (This Tool) | Image file for visual confirmation only. | None (reference only) |
* Based on laws as of December 2025. Consult your legal department for formal contracts.
📋 Types and Uses of Seals
Personal Seals
- Registered Seal: Used for real estate, inheritance, and financial contracts requiring legal validity. Registered with local government.
- Personal Seal: Daily document confirmations, mail receipts, equipment check-outs. No registration required.
- Bank Seal: Designated when opening bank accounts. Used for financial transactions.
Company and Organization Seals
- Company Registered Seal: Used for articles of incorporation, registration, and important contracts. Registered by legal entities.
- Square Company Seal: Used for invoices, quotations, delivery notes, and internal/external documents. No registration required.
- Bank Seal: Used for corporate bank account operations. Usually different from the registered seal.
Stamps Generated by This Tool
This tool generates <strong>round seals (personal-style) and square seals (company-style)</strong>. These are image files without legal force, suitable for simple approval confirmations in remote work, visual representation in internal approvals, and approval marks on PDF files.
❓ Frequently Asked Questions
No. These digital stamps are image files and do not have the legal force of official seals. Use them only for internal documents and informal approvals.
An image format with a transparent background. When inserted into Word, Excel, or PowerPoint, only the seal appears without a white background.
Yes, you can enter full names or any text up to 4 characters in the input field.
All processing is done in your browser. Nothing is sent to our servers - stamps are created on your device only.
Yes, you can freely use the generated stamps. However, for formal contracts, we recommend using official registered seals or certified digital signatures.
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