GroupDocs.Signature

using GroupDocs.Signature;
using GroupDocs.Signature.Options;
using System.Drawing;

// Select PDF document
using (Signature signature = new Signature("sample.pdf"))
{
    // Provide text
    var options = new TextSignOptions("John Smith")
    {
        // Set color
        ForeColor = Color.Red
    };

    // Sign document and save to file
    signature.Sign("signed.pdf", options);
}

import com.groupdocs.signature.Signature;
import com.groupdocs.signature.options.sign.TextSignOptions;
import java.awt.Color;

// Select PDF document
Signature signature = new Signature("sample.pdf");

// Provide text
TextSignOptions options = new TextSignOptions("John Smith");
options.setForeColor(Color.RED);

// Sign document and save to file
signature.sign("signed.pdf", options);

const groupdocs = require('@groupdocs/groupdocs.signature');

// Select the document to sign
const signature = new groupdocs.Signature("sample.pdf");

// Provide the text to sign with
const options = new groupdocs.TextSignOptions("John Smith");

// Sign the document and save to file
signature.sign("signed.pdf", options);
signature.close();

from groupdocs.signature import Signature
from groupdocs.signature.options import TextSignOptions
from groupdocs.pydrawing import Color

# Select PDF document
with Signature("sample.pdf") as signature:
    # Provide text
    options = TextSignOptions("John Smith")

    # Set color
    options.fore_color = Color.red

    # Sign document and save to file
    signature.sign("signed.pdf", options)