EML viewer
Drop in an EML or HTML file to inspect its headers, rendered email, source code, and available attachments directly in your browser.
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See the hidden HTML that comes along for the paste.
Paste content from a document, webpage, or email editor to inspect the clipboard HTML, remove unsafe markup, and copy a cleaner version.
- No signup
- Free to use
- Formatted, sanitized HTML with a visual preview
Free browser tool
What does it paste?
Clipboard content is processed locally and only when you paste into the box.
How it works
From input to useful result in three steps.
- 1
Paste formatted content into the input area.
- 2
Compare the raw clipboard HTML with the cleaned output and preview.
- 3
Copy the cleaned HTML when it contains the structure you need.
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Questions
What does it paste? FAQ
Why does copied text contain HTML?
Many applications place both plain text and rich HTML versions on the clipboard. The receiving app chooses which representation to paste.
What does the cleaner remove?
It removes active or unsafe elements such as scripts, iframes, embedded objects, event-handler attributes, and javascript URLs while preserving ordinary structural markup and inline styles.
Does Hypermatic read my system clipboard?
No. The tool only receives content included in a paste event inside the input box.
Free practical guide
How to inspect and clean hidden HTML from copied content
Rich-text applications often place both plain text and HTML on the clipboard. When that content is pasted into an email editor or CMS, invisible styles, wrapper elements, tracking attributes, and unsafe markup can travel with it and create formatting or security problems.
Quick answer
Paste the content into the free inspector above to compare the raw clipboard HTML with a cleaned version and visual preview. The browser removes active elements, event-handler attributes, and unsafe URLs locally. Review the cleaned markup before using it in an email or production page.
Why does copied text contain hidden HTML?
A clipboard can hold several representations of the same selection. A word processor or webpage may provide plain text for simple destinations and text/html for applications that support formatting. The receiving editor chooses which version to use.
The HTML version can include spans, inline styles, font declarations, classes, data attributes, source-specific metadata, and nested wrappers that are invisible in the original application. A paste can look correct initially while adding code that later conflicts with responsive styles or email-client rules.
| Clipboard content | Typical result |
|---|---|
| Plain text | Words and line breaks without source formatting. |
| Rich HTML | Formatting plus source-generated tags, styles, and attributes. |
| Images or files | Binary clipboard items handled separately by the destination. |
| Application-specific data | Extra formats understood by the source or compatible apps. |
What should an HTML paste cleaner remove?
A defensive cleaner should remove active or embedded elements such as scripts, iframes, objects, forms, and refresh metadata. It should also remove event-handler attributes and javascript URLs that could execute code when the result is displayed.
Cleaning for safety is not the same as optimizing for email. Ordinary inline styles may be safe but still unnecessary, and email-specific markup can require deliberate review. The cleaned view is a better starting point, not an automatic promise that the HTML is production-ready.
- Compare raw and cleaned output instead of trusting a visual preview alone.
- Remove source fonts and spacing rules that conflict with the destination system.
- Preserve only the structure and inline styles the final email actually needs.
- Retest links, lists, tables, and responsive behavior after cleanup.
Why can pasted HTML cause email rendering problems?
Email clients support a constrained and inconsistent subset of web HTML and CSS. Pasted content from Word, Google Docs, Notion, or a webpage can introduce margins, font stacks, semantic elements, or nested spans that the email template did not anticipate.
Paste plain text when the destination already controls typography and spacing. If formatting must be preserved, inspect the HTML, simplify it, and place it inside a tested email component rather than replacing the component’s structure wholesale.
Is it safe to paste confidential content into an inspector?
Clipboard content can contain customer information, unpublished copy, internal URLs, or other sensitive material. Prefer a tool that only receives content after you paste into a specific field and processes it locally rather than uploading it to a remote service.
This free inspector reads the paste event inside the input area and performs its cleaning in the browser. You should still avoid copying secrets unnecessarily, review the destination before pasting, and clear sensitive clipboard content when your operating environment requires it.
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