Watermarks help protect documents, mark drafts, and brand official files. Whether you need to stamp CONFIDENTIAL on a contract or add your company name to a report, you can add a text watermark to every PDF page for free — directly in your browser.
Go to pdfeditor.onl/watermark-pdf. The tool loads in your browser with no installation or sign-up required.
Click the upload area or drag your PDF onto the page. Your document is processed entirely in local memory — it is never sent to a server.
Type your watermark text — such as CONFIDENTIAL, DRAFT, DO NOT COPY, or your company name. Then set the font size, rotation angle, opacity, and color. A diagonal watermark at 45° with 30–40% opacity is the most common professional choice.
Tip: Use a rotation of 45° and opacity around 35% for a watermark that is clearly visible but does not obscure the document content.
Click Apply to All Pages. The watermark is permanently embedded into every page of your PDF. Download the result — the entire process takes just a few seconds.
Yes. The watermark tool lets you choose position (center, top-left, top-right, etc.), rotation, font size, and opacity. Center with 45° rotation is the most common setting for professional documents.
Yes. Clicking "Apply to All Pages" stamps the watermark on every page of the document. You cannot currently target individual pages.
Yes. Watermarks are overlaid on the page canvas regardless of whether the content is native text or scanned images.
Yes — 100% free with no account, no upload, and no watermarks added by the tool itself (only yours).