GroupDocs.Watermark

using System;
using GroupDocs.Watermark;
using GroupDocs.Watermark.Watermarks;
using GroupDocs.Watermark.Options.Pdf;

// Instantiate Watermarker passing PDF path
PdfLoadOptions loadOptions = new PdfLoadOptions();
using (Watermarker watermarker =
    new Watermarker("source.pdf", loadOptions))
{
    // Customize watermark options
    TextWatermark textWatermark =
        new TextWatermark("Approved", new Font("Arial", 8));

    // Apply watermark to PDF document
    watermarker.Add(textWatermark);

    // Save result document
    watermarker.Save("result.pdf");
}

import com.groupdocs.watermark.*;
import com.groupdocs.watermark.watermarks.*;
import com.groupdocs.watermark.options.*;

// Instantiate Watermarker passing PDF path
PdfLoadOptions loadOptions = new PdfLoadOptions();
Watermarker watermarker =
    new Watermarker("source.pdf", loadOptions);

// Customize watermark options
TextWatermark textWatermark =
    new TextWatermark("Approved", new Font("Arial", 8));

// Apply watermark to PDF document
watermarker.add(textWatermark);

// Save result document
watermarker.save("result.pdf");
watermarker.close();

import groupdocs.watermark as gw
import groupdocs.watermark.watermarks as gww
import groupdocs.watermark.options.pdf as gwop
import groupdocs.watermark.common as gwc

# Instantiate Watermarker passing PDF path
pdf_lo = gwop.PdfLoadOptions()
with gw.Watermarker("source.pdf", pdf_lo) as watermarker:
    options = gwop.PdfArtifactWatermarkOptions()

    # Customize watermark options
    text_watermark = gww.TextWatermark("Approved", gww.Font("Arial", 8.0))
    text_watermark.horizontal_alignment = gwc.HorizontalAlignment.RIGHT

    # Apply watermark to PDF document
    watermarker.add(text_watermark, options)

    # Save result document
    watermarker.save("result.pdf")