← Daily AI recipesWork✓ Verified Aug 9, 2026

Visually check and fix AI-generated HTML and Markdown

Open the generated code in a free visual editor, see the result through the user's eyes, and edit without coding

  1. 1.Open ChatGPT or Claude and generate HTML code using the prompt. Copy the result.

    If the service is unavailable in your region, use a VPN or a local model via Ollama.

    ChatGPT ↗About this tool
    Prompt
    Generate a responsive HTML email template for [occasion: e.g., welcome email, newsletter, sale announcement]. Include inline CSS, a header with logo placeholder, a body content section with [main message], and a footer with unsubscribe link. Make it mobile-friendly with max-width 600px.
    What this prompt doesThe prompt in English asks the AI to create an HTML email template. Replace [occasion] with your email type (e.g., welcome email) and [main message] with your text. The AI will return ready-to-use HTML code with inline styles.
  2. 2.Open CodePen - a free online HTML editor with live preview. Click the 'Pen' button in the top left corner.

    Registration is not required for viewing, but is needed for saving. The free plan allows unlimited pens.

    CodePen ↗
  3. 3.Paste the generated HTML code into the HTML panel (left column). If the code contains CSS, move it to the CSS panel (middle column). The preview will appear automatically in the right column.

    If the HTML already has inline styles, you can paste all the code into the HTML panel - no CSS panel needed.

    CodePen ↗
  4. 4.Check the result visually: how the header, text, and buttons look. Switch to mobile view by clicking the resize button at the top of the preview panel.

    Pay attention to text readability, spacing, and element alignment.

    CodePen ↗
  5. 5.If you need to make edits, modify the code in the left panel. Changes will appear immediately in the preview. For Markdown documents, use StackEdit (stackedit.io) - paste your text in the left panel and check the result on the right.

    StackEdit supports real-time preview and export to HTML, PDF, and other formats.

    StackEdit ↗
  6. 6.When you're happy with the result, copy the final code from the editor and use it in your project. For HTML, click the 'Copy' button in the top right of the HTML panel in CodePen.

    Save your pen in CodePen if you want to come back to it later - this requires a free account.

    CodePen ↗
💰 What it costs to followprices as of 2026-08
  • freeChatGPT FreeThe free plan gives access to GPT-4o mini with a limit on the number of messages per hour.
  • freeCodePen FreeThe free plan allows unlimited projects with live preview, no registration required for viewing.
  • freeStackEditA completely free online Markdown editor with real-time preview and export to various formats.
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