Convert CSS class references and <style> tags to inline style attributes · Essential for email HTML · Pure frontend
📖 Frequently Asked Questions (FAQ)
❓ What are inline CSS styles and why do I need to convert CSS to inline?
Inline CSS styles are style properties written directly in the HTML element's style attribute, rather than in a separate <style> tag or external CSS file. Email clients like Outlook and Gmail often don't fully support <style> tags and class selectors, so email HTML must use inline styles. This tool automates the conversion, letting you write standard CSS classes and convert them to email-compatible inline format in one click.
❓ Which CSS selectors does the CSS to inline converter support?
This tool supports class selectors (.class), ID selectors (#id), tag selectors (div, p etc.), descendant selectors (.parent .child), child selectors (.parent>.child), and pseudo-classes (:hover, :focus). Pseudo-classes cannot be inlined but are preserved in the <style> tag as progressive enhancement. Media query rules are also kept intact for responsive email designs.
❓ Can the converted HTML be used directly for email marketing?
Yes. The converted HTML has all style rules turned into inline style attributes, compatible with major email clients (Gmail, Outlook, Apple Mail, Yahoo Mail). For best compatibility, we recommend: 1) Using table-based layouts instead of div; 2) Avoiding Flexbox and Grid; 3) Using absolute URLs for images; 4) Previewing with email testing tools like Litmus or Putsmail before sending.
❓ Does CSS to inline conversion change the original HTML structure?
No. The tool only processes styles — it does not alter the HTML DOM structure, text content, or element order. The original <style> tags and class references are preserved, while each element gets a new style attribute based on the matching CSS rules. If the same CSS property exists in both inline style and <style> tag, the inline style takes precedence, following CSS cascade rules.
❓ How does the converter handle CSS specificity conflicts?
The tool follows CSS cascade rules for specificity calculation. When multiple selectors match the same element, the selector with higher specificity wins (e.g., #id > .class > div). When specificity is equal, later rules override earlier ones. Each element's style attribute contains the final computed values from all matching rules, ensuring consistent rendering across email clients.