How to Merge JSON Files: Fastest and Easiest Way (2026)
Merge multiple JSON files into one using free online tool, Python, or jq command line. Complete guide with code examples for arrays, objects, nested JSON, and deduplication.
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Merge & Combine HTML Files Online
Got multiple HTML files that need to become one? This tool combines them while keeping your CSS styles and JavaScript intact. Perfect for merging documentation pages, assembling email templates, or combining website sections. Just drag, drop, and download.
Drop HTML files or click to browse
Combine multiple HTML documents • Up to 50MB each
Want to test drive the tool?
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>© 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>© 2024</p>
</footer>
</body>
</html>How It Works
Four simple steps
1
Upload HTML Files
Drop multiple .html files or click to browse. Supports files up to 50MB each.
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 with all content, styles, and scripts combined.
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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