HTML email compatibility checker
Scan email markup for scripts, forms, embedded media, iframes, relative URLs, wide fixed layouts, stylesheet dependence, and other patterns that commonly fail across email clients.
Use free toolApply straightforward embedded selector rules to matching elements, preserve existing inline declarations, keep responsive and conditional code available for review, and copy the resulting HTML.
Use the free toolFree browser tool
Your files and inputs are processed locally in this browser and are not uploaded to Hypermatic.
Need the whole email?
This free tool handles one small job. Emailify handles the complete workflow: responsive design, reusable components, breakpoint previews, and HTML export for Gmail, Outlook, Apple Mail, and 40+ email platforms.
How it works
Paste or upload the final email HTML containing embedded CSS.
Inline supported selector rules and review skipped at-rules, invalid selectors, media queries, and the generated source.
Test the transformed HTML in the sending platform and real email clients before launch.
Questions
It handles ordinary selector blocks that the browser can match with querySelectorAll. Nested at-rules, pseudo-elements, unsupported selectors, and client-specific hacks are preserved or reported for manual review.
No. Responsive and other at-rules are preserved in style blocks because they cannot be represented as ordinary inline declarations.
Yes. You can use it without an account or signup. The focused result is generated directly in your browser.
Free practical guide
Apply straightforward embedded selector rules to matching elements, preserve existing inline declarations, keep responsive and conditional code available for review, and copy the resulting HTML. This guide explains what the result means, how to avoid the most common interpretation mistakes, and when the related Emailify workflow becomes the more practical next step.
Quick answer
Paste or upload the final email HTML containing embedded CSS. Inline supported selector rules and review skipped at-rules, invalid selectors, media queries, and the generated source. Test the transformed HTML in the sending platform and real email clients before launch. The tool is free to use without an account, and your files and inputs are processed locally in this browser and are not uploaded to Hypermatic.
Apply straightforward embedded selector rules to matching elements, preserve existing inline declarations, keep responsive and conditional code available for review, and copy the resulting HTML. The immediate result is copyable email HTML with supported CSS moved inline. That makes the tool useful when a focused question needs an answer before a file is handed off, a campaign is trafficked, or a production workflow begins.
The scope is intentionally narrow. It is designed for solving one focused email-production problem, not for replacing the complete production process. A useful result should make the next decision clearer while leaving the original file, design, or workflow under the user’s control.
Your files and inputs are processed locally in this browser and are not uploaded to Hypermatic. Local processing reduces unnecessary data exposure, but it does not remove the need to follow the privacy, confidentiality, and retention requirements that apply to the source material.
Start with the same input that will be used in production whenever possible. Draft content, substitute files, and approximate dimensions can be useful during exploration, but the final check should use the actual export, final copy, destination, or supported range.
Work through the steps in order and keep the generated result beside the source. If the result identifies a warning, decide whether it is a real production problem, an acceptable tradeoff, or a limitation of a browser-based inspection before changing the underlying work.
A browser tool can make measurable signals visible, but it cannot reproduce every application, platform, rendering engine, policy, or team constraint. Treat the report as evidence for a decision rather than a universal guarantee. The strongest verification is the final HTML in the email platforms and client environments the campaign must support.
Pay particular attention to edge cases that are easy to miss during a quick check: unusual fonts, long or localized content, hidden metadata, external dependencies, different aspect ratios, browser-specific behavior, and last-minute source changes. Re-run the tool whenever the production input changes materially.
Which CSS can the inliner apply? It handles ordinary selector blocks that the browser can match with querySelectorAll. Nested at-rules, pseudo-elements, unsupported selectors, and client-specific hacks are preserved or reported for manual review.
Does it remove media queries? No. Responsive and other at-rules are preserved in style blocks because they cannot be represented as ordinary inline declarations.
Is the html email css inliner free? Yes. You can use it without an account or signup. The focused result is generated directly in your browser.
The free tool is the right choice for a quick individual check, calculation, preview, or template. It remains useful even if the task only occurs once and no broader production workflow is needed.
Emailify becomes more practical when the same job turns into designing responsive campaigns and exporting production-ready email HTML from Figma. At that point, keeping the work close to the Figma source reduces repeated exports, copy-and-paste steps, inconsistent decisions, and handoff drift.
Before adopting any workflow, compare the time spent on the recurring manual process with the setup and review required by the tool. The goal is not to add another application; it is to remove repetitive work while preserving the quality checks that still need human judgment.