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CSS to Inline Converter

Developer Tools

Convert external CSS to inline styles for HTML emails.

⚡ Instant🔒 Private, in your browser🆓 Free, no sign-up👥 For developers
Your data never leaves your browser. We do not store inputs.

What CSS to Inline Converter does

CSS to Inline Styles copies CSS rules onto matching HTML elements as style attributes, the format email clients require. Selectors are matched by your browser's own engine, so class, id, descendant, child and attribute selectors all work, and conflicts are resolved by specificity, source order and !important.

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Reviewed by the FreeToolsVerse team · Last updated · How we check our tools

How to use CSS to Inline Converter

  1. Paste your CSS on the left and your HTML (which may include its own <style> tags) on the right
  2. Click Inline the styles
  3. Review the result and the list of rules that could not be inlined
  4. Copy or download the HTML

Who should use it

Made for developers. Typical uses:

  • Converting a designed HTML email template into inline-styled markup before sending a campaign
  • Making a newsletter's styling render consistently across Outlook, Gmail, and Apple Mail
  • Quickly inlining a small CSS snippet for a widget embedded in a third-party page that strips stylesheets

Limitations and accuracy

Rules for :hover, :focus, pseudo-elements and @media cannot be expressed as inline styles, so they are kept in a <style> block, which many email clients ignore.

Accuracy: Output is tested against known inputs. For production code, review the result and run your own tests.

Frequently asked questions

Is CSS to Inline free to use?
Yes, completely free.
Is my data uploaded anywhere?
No, conversion happens locally in your browser.
Is this the same as CSS to Inline Styles?
Both tools inline CSS onto matching HTML elements for the same email-compatibility purpose.
Will media queries and pseudo-classes carry over?
No, inlining only works for static property values on matched selectors — media queries and pseudo-classes like :hover can't be expressed as inline styles.
Does it work with class and ID selectors?
Yes, standard CSS selectors including classes, IDs, and element types are matched.

Learning resources

Explore more in Developer Tools, read the guides and articles, or see how we test our tools.

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