Laravel 10 Digital Signature PDF Tutorial

To add a digital signature on pdf in laravel 10; In this tutorial, you will learn how to add a digital signature on pdf using the DomPDF TCPDF library in Laravel 10 apps.

How to Add Digital Signature on PDF in Laravel 10

Let’s get started with adding a digital signature on PDF in laravel 10 apps:

Step 1: Create a New Laravel Project
Step 2: Install Dependencies
Step 3: Configure Laravel DomPDF
Step 4: Set Up TCPDF for Digital Signatures
Step 5: Create a Controller
Step 6: Create a Route
Step 7: Generate a PDF with Digital Signature

Step 1: Create a New Laravel Project

First of all, open your cmd or terminal and execute the following command into it to install and setup new laravel 10 app into server:

composer create-project --prefer-dist laravel/laravel digital-signature-pdf
cd digital-signature-pdf

Step 2: Install Dependencies

Next, execute the following commands to install laravel-dompdf for PDF generation and tcpdf for digital signatures:

composer require barryvdh/laravel-dompdf
composer require tecnickcom/tcpdf

Step 3: Configure Laravel DomPDF

Once you have installed laravel-dompdf into your laravel project. Now you need to configure dompdf with laravel apps.

So, Open the config/app.php file and add the following line to the providers array:

Barryvdh\DomPDF\ServiceProvider::class,

Next, add the following line to the aliases array in the same file:

'PDF' => Barryvdh\DomPDF\Facade::class,

Step 4: Set Up TCPDF for Digital Signatures

Next, You need to configure TCPDF for digital signatures. Create a new file named tcpdf_signature_config.php in the root directory of your Laravel project with the following content:

<?php
return [
    'signature_title' => 'Digital Signature',
    'signature_title_page' => 'Digital Signature - Page %s',
    'signature_font_size' => 8,
    'signature_image_width' => 25,
    'signature_image_height' => 25,
    'signature_file' => '', // Path to your signature image file
    'signature_coordinates' => [
        'x' => 10,
        'y' => 10,
    ],
];

Important Note:- Replace 'signature_file' with the actual path to your signature image file.

Step 5: Create a Controller

Next, open again your cmd and execute the following command into it to create a new controller for handling PDF generation and digital signatures:

php artisan make:controller PDFSignatureController

Once you have created controller class. Next, you need to edit the PDFSignatureController.php file in the app/Http/Controllers directory with the following code:

<?php

namespace App\Http\Controllers;

use Illuminate\Http\Request;
use PDF;

class PDFSignatureController extends Controller
{
    public function generatePDFWithSignature()
    {
        // Load TCPDF configuration
        $config = config('tcpdf_signature_config');

        // Create a new TCPDF instance
        $pdf = new \TCPDF(PDF_PAGE_ORIENTATION, PDF_UNIT, PDF_PAGE_FORMAT, true, 'UTF-8', false);

        // Set document properties
        $pdf->SetCreator(config('app.name'));
        $pdf->SetAuthor('Your Name');
        $pdf->SetTitle('Sample PDF with Digital Signature');
        $pdf->SetSubject('Digital Signature Example');
        $pdf->SetKeywords('laravel, pdf, digital signature');

        // Set header and footer fonts
        $pdf->setHeaderFont(Array(PDF_FONT_NAME_MAIN, '', PDF_FONT_SIZE_MAIN));
        $pdf->setFooterFont(Array(PDF_FONT_NAME_DATA, '', PDF_FONT_SIZE_DATA));

        // Set default monospaced font
        $pdf->SetDefaultMonospacedFont(PDF_FONT_MONOSPACED);

        // Set margins
        $pdf->SetMargins(10, 10, 10);

        // Set auto page breaks
        $pdf->SetAutoPageBreak(TRUE, 10);

        // Set image scale factor
        $pdf->setImageScale(PDF_IMAGE_SCALE_RATIO);

        // Initialize PDF document
        $pdf->AddPage();

        // Output digital signature image
        if (!empty($config['signature_file'])) {
            $signatureX = $config['signature_coordinates']['x'];
            $signatureY = $config['signature_coordinates']['y'];
            $pdf->Image($config['signature_file'], $signatureX, $signatureY, $config['signature_image_width'], $config['signature_image_height']);
        }

        // Output text for digital signature
        $pdf->SetFont('helvetica', '', $config['signature_font_size']);
        $pdf->SetXY(40, 20);
        $pdf->Cell(0, 0, 'Digitally signed by:', 0, 1);
        $pdf->SetXY(40, 25);
        $pdf->Cell(0, 0, 'Your Name', 0, 1);
        $pdf->SetXY(40, 30);
        $pdf->Cell(0, 0, 'Date: ' . date('Y-m-d H:i:s'), 0, 1);

        // Output PDF to the browser
        $pdf->Output('sample.pdf', 'I');
    }
}

Step 6: Create a Route

In your routes/web.php file, add a route to your newly created controller method:

use App\Http\Controllers\PDFSignatureController;

Route::get('/generate-pdf', [PDFSignatureController::class, 'generatePDFWithSignature']);

Step 7: Generate a PDF with Digital Signature

Now, you can generate a PDF with a digital signature by visiting the following URL in your browser:

http://your-domain/generate-pdf

Conclusion

Congratulations 🎊! You have successfully implemented digital signature functionality for PDF documents in Laravel 10 using TCPDF and Laravel DomPDF.

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