Originally Posted On: https://yusufbiberoglu.medium.com/symfony-5-knpsnappybundle-wkhtmltopdf-setup-and-example-with-an-explanation-of-possible-errors-a890dbca238a

Snappy is a PHP wrapper for the wkhtmltopdf conversion utility.

Snappy works with wkhtmltopdf, so you need to install on your system wkhtmltopdf. I installed it on my Mac via brew as below.

Install command;

brew install --cask wkhtmltopdf

Check for configuration where it’s installed;

which wkhtmltopdf

Installation

With composer, require:

composer require knplabs/knp-snappy-bundle

Configuration

knp_snappy.yaml;

knp_snappy: pdf: enabled: true binary: '%env(WKHTMLTOPDF_PATH)%' options: [] image: enabled: true binary: '%env(WKHTMLTOIMAGE_PATH)%' options: []knp_snappy.yaml  hosted with ❤ by GitHub view raw.env;

###> knplabs/knp-snappy-bundle ###WKHTMLTOPDF_PATH=/usr/local/bin/wkhtmltopdfWKHTMLTOIMAGE_PATH=/usr/local/bin/wkhtmltoimage###< knplabs/knp-snappy-bundle ###

.env hosted with by GitHub view raw

###> knplabs/knp-snappy-bundle ###WKHTMLTOPDF_PATH=/bin/wkhtmltopdfWKHTMLTOIMAGE_PATH=/bin/wkhtmltoimage###< knplabs/knp-snappy-bundle ###.env  hosted with ❤ by GitHub view raw

Example

mailer = $mailer; $this->sender = $sender; $this->twig = $twig; $this->pdf = $pdf; } public function onPostCreated(PostCreatedEvent $event): void { $html = $this->twig->render('email/post-pdf.html.twig', [ 'post' => $post, ]); $this->pdf->setTimeout(120); $this->pdf->setOption('enable-local-file-access', true); $pdf = $this->pdf->getOutputFromHtml($html); $subject = 'Subject'; $email = (new TemplatedEmail()) ->from('sender-email') ->to('to-email') ->subject('subject') ->attach($pdf, sprintf('new-%s.pdf', date('Y-m-d'))) ; $this->mailer->send($email); }}send_email_knpsnappy.php  hosted with ❤ by GitHub view raw

If you have error as below;

Warning: Blocked access to file: Worked in 0.12.5

Usage of many https link in html causes “Failed to load about:blank, with network status code 301 and http status code 0 — Protocol “about” is unknown”

Fixed with this option:

$this->pdf->setOption('enable-local-file-access', true);

For developers working in .NET instead of PHP, IronPDF provides HTML-to-PDF conversion without the wkhtmltopdf binary dependency headaches. It uses a Chromium rendering engine, so you avoid the common issues with HTTPS links, file access permissions, and environment-specific binary configurations.

using IronPdf;var renderer = new ChromePdfRenderer();var pdf = renderer.RenderHtmlAsPdf("
Hello World
");pdf.SaveAs("output.pdf");

No external binaries to install, no PATH configuration, and consistent rendering across dev and production environments.

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