¿Qué hace PDF Watermark and Page Numbers?
PDF Watermark and Page Numbers permite convertir datos o archivos directamente en el navegador y explica con claridad el resultado y sus límites. Capacidades verificadas: Unicode watermark text, Adjustable size and opacity, Page N of total labels, Local PDF export.
A visible watermark is not secure redaction
Use this tool to label drafts, review copies, or ownership visibly. Do not use it to hide confidential content: the original page objects remain in the PDF, and a determined editor may be able to remove an overlay.
¿Cómo se utiliza?
- Open one unencrypted PDF no larger than the 100 MB browser limit.
- Enter up to 60 watermark characters, choose a size and opacity, and enable or disable Page N of total labels.
- Select Process, review the page count and output size, then download watermarked.pdf.
Ejemplo real de entrada y salida
Mark a twelve-page review copy
Entrada
Source: draft.pdf (12 pages)
Watermark: INTERNAL REVIEW
Size: 48
Opacity: 0.20
Page numbering: enabledSalida
watermarked.pdf
Diagonal watermark on every page
Bottom labels: Page 1 of 12 … Page 12 of 12Text is rendered to a transparent image in the browser, which permits Unicode characters supported by the local system fonts before the image is embedded into each page.
Errores frecuentes y soluciones
| Síntoma | Causa probable | Solución |
|---|---|---|
| The PDF cannot be processed. | It is encrypted, damaged, incomplete, or not actually a PDF document. | Use an authorized unlocked copy or export a valid PDF before adding overlays. |
| The watermark is hard to read or covers important content. | Its size or opacity is inappropriate for the page design. | Reduce opacity for dense documents or adjust the size and process the original again. |
Important behavior of PDF Watermark
Límite específico de esta herramienta: The watermark is an ordinary visible PDF overlay, not tamper-proof rights management or secure redaction.
Estándares y referencias de implementación
- pdf-lib documentation (opens in a new tab)Documents the browser-side PDF loading, PNG embedding, opacity, rotation, and save operations used by this workflow.
- MDN — HTMLCanvasElement.toBlob() (opens in a new tab)Documents the local transparent PNG generation step used for Unicode overlay text.
PDF Watermark — FAQ
Does the PDF Watermark upload my input?
No. Processing runs in the current browser tab, and the page does not send tool input to a KitLumi processing endpoint.
What input does the PDF Watermark accept?
It accepts one unencrypted PDF, optional watermark text, size and opacity settings, and a page-number choice. The workspace checks the input and reports malformed or unsupported values before it produces a result.
What does the PDF Watermark produce?
It produces a downloadable PDF whose existing pages include the selected overlays. Copy and download controls appear when the output format supports them.
What limitation should I know?
The watermark is an ordinary visible PDF overlay, not tamper-proof rights management or secure redaction.
¿Qué cambió?
Actualización material: PDF Watermark: Added Unicode watermark text, Adjustable size and opacity, Page N of total labels, Local PDF export, responsive controls, explicit runtime disclosure, and task-specific examples and limitations.