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Add a watermark to a PDF
Stamp diagonal or positioned text on every page — color, size and opacity are up to you. Locally, of course.
This tool runs entirely in your browser. Your file is never uploaded.
よくある質問
Can I remove a watermark with this tool?
No — this tool only adds watermarks to your own documents. Removing third-party watermarks may violate copyright.
Does the watermark appear on every page?
Yes, it is stamped on all pages with the same position and style.
Are my files uploaded to a server?
No. All local tools process your file inside your browser using WebAssembly. You can verify this in the Network tab of your browser's developer tools.
Do I need a subscription?
No. Local tools are free without limits. AI features use one-time credit packs whose balance never expires.