They are effective for internal documents and PDF approvals. However, important legal documents such as real estate contracts may require a registered seal with a certificate of seal impression. While these differ from electronic signatures under digital signature laws, they are widely used for everyday business documents (estimates, invoices, internal approval forms, etc.).

The seal is saved as a transparent PNG image, so you can insert it directly.
- Excel: Insert > Picture > select the downloaded PNG
- Word: Insert > Picture > select the downloaded PNG
Since the background is transparent, the seal overlays naturally on top of document text.

When stamping with a real seal, natural wear occurs due to uneven ink distribution and paper texture. Adding a wear effect recreates a realistic seal impression and reduces the overly digital appearance. Adjustable from 0% (none) to 100% (heavy).

Sizes are calibrated at 350 DPI to match actual seal dimensions. Personal seal 10.5mm = 145px, Bank seal 12mm = 165px, Registered seal 15mm = 207px. When inserted at 100% into a PDF or Word document, they print at approximately actual size.

No. All processing is completed within your browser using the Canvas API. Text input and generated images are never transmitted to any server. When you close the page, all data is completely erased.

Yes. The Date Stamp tab supports Western calendar format (yyyy.mm.dd) as well as Japanese era format (e.g., R7.03.02). You can choose from 4 different date formats.