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Añadir Marca de Agua

Añade marcas de agua de texto o imagen a documentos PDF.

Upload PDF File

Drag and drop a PDF file.

API para desarrolladores

Disponible por API

Automatiza este flujo PDF con la API de PDF Tools. Cada solicitud correcta cuesta 1 Credit y los intentos fallidos se reembolsan automáticamente.

/api/external/pdf-tools/add-watermark1 Credit por solicitud correctaSalida: result.pdf
Documentación APIObtener API Key
curl -X POST https://itextmaster.com/api/external/pdf-tools/add-watermark \
  -H 'x-api-key: YOUR_API_KEY' \
  -F 'file=@input.pdf;type=application/pdf' \
  -F 'options={"text":"Confidential","opacity":0.3}' \
  --output result.pdf

Acerca de esta herramienta

Añadir Marca de Agua te permite insertar marcas de agua de texto o imagen en tus documentos PDF para protección o branding.

Procesamiento local.

Cómo usar

  1. Sube tu PDF

    Arrastra y suelta o selecciona el documento.

  2. Configura Marca de Agua

    Ingresa texto o sube imagen, ajusta posición y opacidad.

  3. Aplica y Descarga

    Añade la marca de agua y descarga.

Casos de uso

Proteger Documentos

Marca documentos como confidenciales o borradores.

Branding

Añade logo de empresa a documentos.

Derechos de Autor

Protege contenido con marcas de copyright.

Practical guide

Why choose local processing?

  • Business PDFs can contain contracts, invoices, identity details, or internal business information, so keeping processing in the browser reduces exposure.
  • The website tool is free to use with no usage limits and does not require sign-in.
  • Local processing also keeps iteration fast: adjust options, preview the result, and export a branded PDF without waiting for an upload queue.

Best files for this tool

  • Best for PDF files that open correctly in a modern browser and are not intentionally damaged or restricted.
  • Works well for everyday business, school, legal, finance, and personal documents where you need a branded PDF.
  • For very large files, close unused tabs and process one batch at a time so the browser has enough memory.

Common limitations

  • Encrypted or permission-restricted PDFs may need to be unlocked before processing.
  • Scanned pages, unusual fonts, complex layers, and damaged files can reduce accuracy or processing speed.
  • Browser memory and device performance matter more for local tools than for upload-based services.

Local processing vs upload-based tools

  • Local tools keep routine website processing on your device, while upload-based tools send files to a remote server.
  • Upload-based services can move heavy work off your computer, but they add transfer time and require trusting a server with your files.
  • Use the API when you intentionally need server-side automation; use the website when you want private manual processing.

What to do if processing fails

  • Try a smaller file, a shorter page range, or one file at a time if the browser runs out of memory.
  • If a PDF is encrypted, damaged, or restricted, unlock or repair it first and then retry the workflow.
  • If the output looks wrong, check whether the source file uses scans, complex transparency, form fields, or unsupported embedded objects.

API automation

Automate apply text or image marks with the PDF Tools API. Each successful request uses 1 Credit, and every signed-in user receives 100 free API Credits each month.

View API automation docsCreate API Key

Preguntas frecuentes

¿Puedo usar imágenes?

Sí, soporta PNG, JPG y otros formatos de imagen.

¿Puedo ajustar la opacidad?

Sí, ajusta la transparencia de 0% a 100%.

¿Se aplica a todas las páginas?

Puedes aplicar a todas o seleccionar páginas específicas.

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