``inky_to_html`` ================ The ``inky_to_html`` filter processes an `inky email template `_: .. code-block:: html+twig {% apply inky_to_html %} {% endapply %} You can also use the filter on an included file: .. code-block:: twig {{ include('some_template.inky.twig')|inky_to_html }} .. note:: The ``inky_to_html`` filter is part of the ``InkyExtension`` which is not installed by default. Install it first: .. code-block:: bash $ composer require twig/inky-extra Then, on Symfony projects, install the ``twig/extra-bundle``: .. code-block:: bash $ composer require twig/extra-bundle Otherwise, add the extension explicitly on the Twig environment:: use Twig\Extra\Inky\InkyExtension; $twig = new \Twig\Environment(...); $twig->addExtension(new InkyExtension());