Tutorials Viewing PDF attachments in the browser

[Xenforo]

The issue:

Cannot get Safari to view PDF attachments in the browser, it always just downloads.

The fix option 1:

Install the Open PDF v1.5 add-on:

AndyB - Open PDF

Jan 27, 2026

Opens PDF attachments in the browser.

• Xenforo
• Paid Add-ons [2.x]

The fix option 2:

Add this code to your src/config.php file:

$c->extend('inlineImageTypes', function(array $imageTypes)
{
    $imageTypes['pdf'] = 'application/pdf';
    return $imageTypes;
});