CSS Inliner for Email
Convert your CSS stylesheet to inline style attributes for perfect HTML email rendering across Outlook and Gmail.
How CSS Inliner for Email Works & Technical Principles
Compile external stylesheets and embedded styles directly into HTML inline style attributes in your browser. All processing executes locally to guarantee full privacy and layout fidelity.
Technical Overview: Inline CSS Cascading in Email Clients
Legacy desktop and webmail clients (such as Outlook and Gmail) often strip <link> stylesheets and sanitize <style> blocks to prevent styling collisions. Inlining CSS rules directly onto individual HTML elements guarantees that font sizes, layouts, and colors remain visually intact across all email software.
Input & Configuration
Paste your raw HTML markup and CSS declarations, or provide a complete template containing embedded style tags.
Client-Side Processing
The client engine builds an in-memory virtual DOM, resolves CSS specificity hierarchies, and merges matching rules.
Instant Output & Export
Copy clean, production-ready HTML with styles inlined directly into element style attributes.
Key Capabilities & Features
Broad Email Client Compatibility
Engineered to satisfy rendering engines across Outlook 2010-2021, Gmail Web and Mobile, Apple Mail, and Yahoo Mail.
Preserves Media Queries & Pseudo-classes
Retains mobile responsive @media breakpoints and :hover states in the head while inlining core layouts.
100% In-Browser Privacy Guarantee
Marketing email templates, campaign copy, and customer metadata never leave your local browser.
CSS Specificity Calculation
Accurately resolves specificity conflicts between element, class, and ID selectors to ensure correct styling overrides.
Compliant with W3C cascade, inheritance, and specificity calculation standards
Optimized for standard MIME-formatted multipart/alternative HTML email bodies