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Editorial Team
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Asked: 2026-05-28T11:07:55+00:00

I am using TCPDF’s writeHtml function for a page that renders properly in the

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I am using TCPDF’s writeHtml function for a page that renders properly in the browser.
In the output PDF, the fonts are too small. I’ve tried with setFont, but it doesn’t seem to have an effect. Does anyone have experience with this?

I’d like to add here that the HTML is not always in my control, so I would prefer to do this with TCPDF options(and not by modifying the source html)

UPDATE: I am able to change the font size by setting it on the body. The only remaining problem is that, to render correctly in the browser, it needs to be 12px. To render correctly in the PDF, it needs be something like 30px. Do I set the media on the css? What is the media type for TCPDF?

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1 Answer

  1. Editorial Team

    Are you using tags? tcpdf’s HTML engine gives the tag precedence over any CSS, or other size-adjusting tags. If you remove any extraneous tags from the HTML and use straight CSS, things should render as expected. Or, if you aren’t using CSS, you should. Just because a browser displays it correctly doesn’t mean it will look the same on other formats. The browser has likely performed some magic of its own to fill in the gaps in your CSS specifications.

    UPDATE

    Here’s an example of specifying CSS declarations with your HTML when using tcpdf. Note how all the styling is applied using the CSS declarations inside the <style> tag outside the actualy HTML body.

    <?php

$html = <<<EOF
<!-- EXAMPLE OF CSS STYLE -->
<style>
  h1 {
    color: navy;
    font-family: times;
    font-size: 24pt;
    text-decoration: underline;
  }
  p {
    color: red;
    font-family: helvetica;
    font-size: 12pt;
  }
</style>
<body>
<h1>Example of <i>HTML + CSS</i></h1>
<p>Example of 12pt styled paragraph.</p>
</body>
EOF;

$pdf->writeHTML($html, true, false, true, false, '');

?>
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