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People stamping drafts, client copies, internal documents, and branded exports with simple visible watermark text
Adding a clear text watermark to one PDF without opening desktop software or uploading the file to a cloud editor
Capture watermark-PDF and stamp-PDF intent with a focused browser-first finishing tool that fits the current Cleanor PDF workspace
Cleanor Labs
These sections explain the job in plain language and set expectations for what the tool should do well.
Adding a watermark to a PDF with this tool is a focused, four-step finishing job rather than full document editing. You load one PDF, type the watermark text, adjust how it looks, and export the stamped file — all inside the browser, with nothing sent to a server.
Because the goal is to mark a document clearly rather than rewrite it, the controls stay simple: placement, opacity, and scale are enough to make the stamp readable without obscuring the underlying content. The same text watermark is applied consistently to each page of the exported PDF.
A PDF watermark is most useful at the end of document work, when the content is finished and the file needs to be marked for context. Common cases include flagging a draft or review copy, labeling internal versus client-facing documents, and adding light branding to admin exports.
This tool is intentionally a text-watermark tool, not a full design editor, so it handles those finishing jobs quickly. For internal files and client documents, the fact that processing happens locally in your browser is part of why it is dependable — sensitive PDFs are never uploaded.
Short answers for the questions people usually have before trying a utility like this.
Yes. Watermark PDF is completely free and runs in your browser with no sign-up, no upload queue, and no per-file limits.
No. Watermarking happens entirely in your browser, so the source PDF stays on your device the whole time and is never uploaded.
Yes. The chosen text watermark is applied to each page of the exported PDF automatically.
No. This tool is focused on fast text watermarks rather than image or logo placement, which keeps the workflow simple and quick.
Yes. Because it runs in the browser, you can watermark a PDF on a phone or tablet as well as a desktop, with the file staying on your device.
Every tool on Cleanor is free with no sign-up, no credits, and no limits. Files are processed privately in your browser. Looking for on-device phone cleanup and Premium features? That lives in the Cleanor app.
Stamp a PDF with a simple text watermark in the browser, keep the original local, and download the updated file right after export.