Scow HTML Email Inliner & Bundler

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library 4.0.0-alpha.5 ·javascript
verified May 27, 2026

Scow is an HTML email inliner and bundler designed to prepare modern HTML and CSS for consistent rendering across a diverse range of email clients. Historically, email clients exhibit inconsistent support for external stylesheets and `<style>` tags within the `<head>` of an HTML document, often stripping them entirely. This necessitates that CSS be applied directly as `style` attributes on individual HTML elements for reliable presentation. Scow automates this critical inlining process, abstracting away the complexities of email client rendering quirks. Additionally, it aims to bundle associated assets like images, potentially converting them to data URIs. Currently available as `4.0.0-alpha.5`, the package is undergoing active alpha development, meaning its API and feature set are subject to change without strict adherence to semantic versioning until a stable release. Its core value lies in streamlining the email development workflow, ensuring that visually rich emails display as intended, despite the varied and often outdated rendering engines used by different email services and applications.

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