Inspect an email package before it ships.

Find broken assets, risky markup and email-client CSS warnings without rendering the template.

HTML or ZIP 15 MiB input 500 ZIP entries No remote asset fetches

Choose the release candidate

Use one HTML file or a ZIP containing HTML, CSS and local assets.

Email source One HTML or ZIP file. ZIP contents are processed in this page.

No file selected.

Selected email content is processed in this page and is not sent to a WebRynx application endpoint. The tool does not execute scripts, render the email or fetch resources referenced by it.

No preflight result yet. Choose a release candidate or load the sample.