merge-json-files.com

Merge & Combine HTML Files Online

Got multiple HTML files that need to become one? This tool combines them and can preserve simple CSS and JavaScript tags. It is best for documentation pages, email template pieces, and simple website sections where you can review the merged output before publishing.

Want to test drive the tool?

Download Sample HTML Files

Before & After

HTML file merge in action

Separate HTML Files
html
// header.html
<header>
  <h1>My Website</h1>
  <nav>...</nav>
</header>

// content.html
<main>
  <h2>Welcome</h2>
  <p>Content here...</p>
</main>

// footer.html
<footer>
  <p>&copy; 2024</p>
</footer>
Merged HTML Document
html
<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Merged Document</title>
  <style>/* All styles combined */</style>
</head>
<body>
  <!-- header.html -->
  <header>
    <h1>My Website</h1>
    <nav>...</nav>
  </header>
  
  <!-- content.html -->
  <main>
    <h2>Welcome</h2>
    <p>Content here...</p>
  </main>
  
  <!-- footer.html -->
  <footer>
    <p>&copy; 2024</p>
  </footer>
</body>
</html>

How It Works

Four simple steps

1

Upload HTML Files

Drop multiple .html files or click to browse. Large files depend on browser memory and embedded assets.

2

Reorder Files

Arrange files in the desired order using arrow buttons. Order determines merge sequence.

3

Configure Options

Choose to preserve styles, scripts, add separators, and customize merge behavior.

4

Download Result

Get a single merged HTML file. Simple styles/scripts can be preserved, but complex pages may need cleanup.

Use Cases

Real-world scenarios

Documentation Pages

Combine multiple documentation pages, API references, or tutorial sections into one searchable document. Great for offline access or creating PDFs.

Email Templates

Merge header, content, and footer HTML pieces into complete email templates. Inline styles stay intact for consistent rendering across email clients.

Report Assembly

Put together data visualization pages, charts, and analysis sections into comprehensive reports. Perfect for archiving or sharing complete findings.

Website Sections

Combine modular HTML components into complete pages. Useful during development or for creating single file versions of multi part websites.

FAQ

Common questions

Programmatic Merging

Python and Bash

Pythonmerge_html.py
from bs4 import BeautifulSoup

def merge_html_files(file_paths, output_path):
    merged_styles = []
    merged_bodies = []
    
    for path in file_paths:
        with open(path, 'r', encoding='utf-8') as f:
            soup = BeautifulSoup(f.read(), 'html.parser')
            
            # Extract styles
            for style in soup.find_all('style'):
                merged_styles.append(f"/* From {path} */")
                merged_styles.append(style.string or "")
            
            # Extract body content
            if soup.body:
                merged_bodies.append(f"<!-- {path} -->")
                merged_bodies.append(str(soup.body)[6:-7])
    
    # Build final HTML
    final_html = f"""<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Merged Document</title>
  <style>
{''.join(merged_styles)}
  </style>
</head>
<body>
{''.join(merged_bodies)}
</body>
</html>"""
    
    with open(output_path, 'w', encoding='utf-8') as f:
        f.write(final_html)

# Usage
files = ['header.html', 'content.html', 'footer.html']
merge_html_files(files, 'merged.html')
Bashmerge-html.sh
#!/bin/bash
# Simple HTML file merger

OUTPUT="merged.html"

echo '<!DOCTYPE html>' > "$OUTPUT"
echo '<html><head><meta charset="UTF-8"></head><body>' >> "$OUTPUT"

# Merge all HTML files
for file in *.html; do
  echo "<!-- ========== $file ========== -->" >> "$OUTPUT"
  sed -n '/<body>/,/<\/body>/p' "$file" | sed '1d;$d' >> "$OUTPUT"
done

echo '</body></html>' >> "$OUTPUT"
echo "Merged HTML files into $OUTPUT"

Complete Guide

In-depth walkthrough

When you'd actually merge HTML files

Combining HTML email templates that were built in separate parts (header, body, footer) is the most common use case. Email clients don't support external stylesheets, so you need everything in one file with inline styles.

Stitching together static site pages exported from different tools happens when you're pulling content from a CMS, a documentation generator, and hand-coded sections. You need one HTML file for archiving or offline viewing.

Combining scraped HTML fragments into one document for processing is useful when you've extracted product listings, article sections, or data tables from multiple pages and need to run a single parser over everything.

This is a niche use case. Most modern web development uses build tools that handle component assembly automatically. But when you need to manually combine HTML files, this tool does it without breaking your styles or scripts.

What the merger does and doesn't do

It concatenates the HTML content from your files in the order you upload them. The tool extracts body content and combines it into one document with a proper HTML5 structure.

It does not intelligently merge head sections, combine stylesheets, or resolve conflicting CSS. If both files define .header {color: red} and .header {color: blue}, both rules end up in the output and the last one wins.

If both files have a full HTML structure (doctype, head, body), you'll want to keep only one of those wrappers in the output. The tool can strip out the extra structure, but you should review the result.

Best used for merging HTML fragments or body content, not full pages. If you're combining complete HTML documents, expect to do some manual cleanup afterward.

Handling duplicate styles and scripts

If both files reference the same CSS or JS files (like <link href="styles.css"> or <script src="app.js">), you'll get duplicate tags in the merged output. Remove the extras manually or your page will load the same file twice.

If both files have inline styles with the same class names but different values, the last one in the document wins. Example: if file1 has .btn {color: red} and file2 has .btn {color: blue}, all buttons will be blue.

A quick cleanup in VS Code (Ctrl+H to find and remove duplicate tags) takes 2 minutes. Search for your script or link tag, check how many times it appears, and delete the duplicates.

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