Add custom text watermarks to every page of your PDF — CONFIDENTIAL, DRAFT, or any text. No upload.
Text watermarks mark documents as CONFIDENTIAL, DRAFT, SAMPLE or any custom label, making it visually clear that a document is preliminary or restricted. The watermark text is embedded directly into the page content using pdf-lib — it is part of the PDF structure, not a floating overlay — making it persistent across all PDF viewers. Choose colour, opacity, size and position.
PDF watermarks are used to mark documents as confidential, draft versions, samples, or internal use only. They appear across the page content, making it clear that the document is not final or should not be distributed. Businesses use watermarks on contracts, legal documents, reports and presentation drafts.
OneConvert adds the watermark text directly to the PDF page structure using pdf-lib — entirely in your browser. No upload, no server processing. Your document stays private.
Frequently Asked Questions
Yes — free, no account, no limits.
Yes — choose between diagonal centre, top or bottom positioning.
Yes — type any custom text or use the quick presets like CONFIDENTIAL or DRAFT.
No. The watermark is applied in your browser using pdf-lib. Your file never leaves your device.
Once embedded in the PDF, a text watermark becomes part of the page content. It can be removed with PDF editing software but not with a simple click.
This tool currently supports text watermarks only. Image watermarks require embedding a graphic, which goes beyond what pdf-lib supports in the browser without additional processing.
Yes — the text is embedded into the PDF page content and will appear when printing, just as it appears on screen.
Short, uppercase text in large font with 20-35% opacity works best visually. CONFIDENTIAL, DRAFT and SAMPLE are the most common. Custom text can be any length, but very long text may overlap page edges at the diagonal centre position.