Marca de agua en PDF
Añade marcas de agua de texto o imagen a las páginas de tu PDF
Procesado completamente en tu navegador. Sin subida de archivos.
Cómo funciona
Subir
Arrastra tu archivo
Procesar
Procesado en tu navegador
Descargar
Guarda el resultado
Preguntas frecuentes
- How do I add a watermark to a PDF?
- Drop your PDF onto the page. Choose text or image watermark. For text, type your watermark text and customise the font, size, colour, and rotation. For image, upload a PNG or JPG. Set opacity and position, then apply to all pages.
- Can I position the watermark exactly where I want?
- Yes. Choose from preset positions (centre, corners, edges) or drag the watermark in the live preview to position it exactly. The same position applies to every page.
- Is my PDF uploaded to a server?
- No. Watermarking runs entirely in your browser using pdf-lib. Your file and watermark image never leave your device.
- Can I use a transparent PNG as the watermark?
- Yes. PNG transparency is preserved, so logos with transparent backgrounds blend cleanly with the PDF content. You can also adjust the watermark's opacity independently.
- Is this tool free?
- Yes — fully free with no account required.
- Does it work on mobile?
- Yes. The watermark tool works in any modern mobile browser. The drag-to-position preview works with touch.
- Can I add a watermark behind the content instead of on top?
- Yes. Choose between 'over' (in front of the page content) and 'under' (behind the page content). Under-mode is useful for subtle background watermarks that don't obscure text.