Make a Japanese seal (hanko) and stamp documents
Japanese paperwork still expects a red seal where other countries expect a signature. This makes the digital kind — and stamps it straight onto your PDF, without your document or your name touching a server.
- Runs entirely in your browser
- Works offline
- No upload
- No sign-up
- No watermark
Loading the tool…
How it works
- Choose the seal type, type the name or company, and tune size, colour and wear.
- Download the seal as a transparent PNG — or go straight to stamping.
- Drop a PDF or image, click where the seal belongs, and download the stamped copy.
Why nothing is uploaded
Every operation on this page is done by code running inside your browser tab, using the same engine that renders web pages. The file is read from disk into your tab’s memory, transformed there, and written back out as a download. It is never sent anywhere — not to us, not to a third party.
Verify it yourself
- Open your browser’s developer tools (F12) and select the Network tab.
- Load your file and run the tool.
- The only requests you will see fetch the tool’s own code — and, for a few heavy tools, their open-source engine from a public CDN — plus one small page-view ping to loreatec.jp (page address and title, nothing more). None of them carry your file.
Frequently asked questions
Is a digital seal legally valid?
It carries no identity — anyone can make any name’s seal, here or anywhere. It works exactly like a rubber stamp: a mark of approval that Japanese business practice accepts on quotes, invoices and internal documents. Anything requiring legal force uses a registered seal (実印) or a certificate-based e-signature, which are different mechanisms entirely.
Why does the stamped seal look inked rather than pasted on?
The seal is blended with a multiply operation, the way real ink darkens paper instead of sitting on top of it. Combined with the optional kasure wear effect, the result reads as pressed, not copy-pasted — which is what makes people accept it on a document.
Why not the traditional tensho script?
Carved hanko use 篆書, and there is no tensho font with a licence that allows this site to ship it. Rather than imitate it badly, the tool makes the modern digital seal — which is what Japanese offices actually put on PDFs.
Does my name or document leave the browser?
No. The seal is drawn on a canvas in this tab and the PDF is stamped by the same tab. For a tool whose whole input is a personal name on a business document, that is not a nicety — it is the requirement.