INLINER

Because most email clientsparticularly Outlook versions on Windowsstrip external CSS and apply limited support for embedded stylesheets, inlining CSS directly into HTML element attributes is a fundamental requirement for HTML emails that render correctly across all major email platforms.

The tool processes HTML email templates by parsing all CSS rules and applying them as inline style attributes on the matching HTML elements, handling the specificity and cascade logic correctly so that the resulting inline styles faithfully reproduce the visual design defined in the original stylesheet.

This automation eliminates the manual inline styling work that email developers would otherwise need to perform for every campaign template, reducing development time and the risk of inconsistencies between the intended design and the inlined version.

Inliner is an essential utility in the HTML email development workflow for agencies, email platform developers, and in-house email teams who produce email templates and need to ensure consistent rendering across email clients without manually managing inline styles.

Integration options including command-line interface, npm package, and API make it straightforward to incorporate CSS inlining into automated email production pipelines and build processes.