# Import your own HTML

> Paste HTML you have built elsewhere into the editor and carry on editing it in MailMachine.

Source: https://www.kualo.com/knowledgebase/mailmachine-campaigns/import-your-own-html
Updated: 2026-06-10

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If you've built an email's HTML elsewhere, you can paste it straight into MailMachine and carry on editing it in the HTML editor. This guide covers importing it.

## Import your HTML

1. When creating a new campaign, choose **Start with your own code**.
2. Paste your code into the editor.
3. Click **Upload and Edit**.

From there you can edit it in the HTML editor, adjust as needed, and save it as a template to reuse.

## Best practices

- Use clean, valid HTML, and inline your CSS - many email clients ignore external stylesheets.
- Include responsive elements for mobile.
- Remove JavaScript; it isn't supported in email.
- Keep the file size reasonable for faster loading.

## Troubleshooting

**It looks different after import** - the usual cause is CSS that isn't inline; run your HTML through a CSS-inlining tool first, and avoid unsupported HTML5/CSS3 features and JavaScript.

**The import button is disabled** - your code can't be empty, watch for unclosed tags, and keep within the size limit (around 100 KB).

**Images are broken** - use absolute URLs (https://..., not /images/...), make sure the host allows hotlinking, and use web formats (JPG, PNG, GIF).

**Responsive design isn't working** - check your media queries are well-formed and supported, use table-based layouts as a fallback, and test on real devices.

Always test before sending - see **[Testing your campaign](/knowledgebase/mailmachine-campaigns/testing-your-campaign)**. Stuck? [Open a support ticket](/knowledgebase/getting-started/how-to-create-a-support-ticket-in-mykualo).

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_Source: Kualo Knowledgebase — https://www.kualo.com/knowledgebase/mailmachine-campaigns/import-your-own-html · © Kualo Ltd._