Ajouter un filigrane confidentiel au PDF — Tamponner les documents sensibles

Questions Fréquentes

How do I mark a PDF as confidential?

Open our PDF Watermark tool, drop your PDF, type 'CONFIDENTIAL' (or any custom text), and pick your style — diagonal in red is the most common. Click 'Add' and your PDF is watermarked. The mark is visible on every page and (by default) flattened into the page content.

Does the watermark look professional?

Yes — we use crisp vector text (any system font), accurate rotation, and adjustable opacity. The classic look is 45° diagonal, red, 25% opacity across the center of each page. For headers, choose horizontal small text top-right or bottom-center with low opacity.

Can the watermark be removed?

Flattened watermarks (default) become part of the page content — they can't be removed without re-OCR'ing or re-rendering the entire page. Layer-based watermarks (selectable in advanced settings) can be removed by recipients via Adobe Pro. Use flattened for sensitive documents; use layered for visible branding that doesn't need to be permanent.

Will my PDF be uploaded?

No. pdf-lib processes everything in your browser. Whether your PDF contains attorney-client privileged information, M&A deal materials, or HR records, the file stays on your device. Ideal for confidential workflows.

Can I add multiple watermarks (e.g. CONFIDENTIAL + DRAFT)?

Yes — drop multiple watermarks in our tool. Each is rendered independently and stacked on the page. Useful for combining classifications (e.g. 'INTERNAL' + 'DRAFT v2'), adding date stamps, or appending page numbers as text watermarks.

Does it support image watermarks (logos)?

Yes — for company logos or graphic watermarks, switch to 'Image Watermark' mode and upload a PNG with transparency. We then stamp the logo across pages with adjustable size, position, and opacity. This is the 'Watermark with Logo' scenario — see our other tools.