🛠️ How It Works – Clean Sub-domains

1. Paste Your Sub-domain List – Insert your raw list of sub-domains into the input box.
2. Click “Clean Sub-domains” – The tool will process your input, removing duplicates and unnecessary entries.
3. View Cleanup Info – Instantly see counts for total input lines, duplicates removed, and final results.
4. Get Your Clean List – Only unique, clean sub-domain entries remain in the output.
5. Copy or Download – Save your cleaned list for your records or immediate use.

⚡ Why Use a Clean Sub-domains Tool?

• Remove Noise – Automatically drop duplicate or irrelevant sub-domains to streamline your list.
• Improve Accuracy – Prevent wasted work by ensuring each sub-domain is unique before further use.
• Save Time – Clean large lists instantly and accurately without manual editing.

💡 Tips for Best Results

• Works best with lists in plain text, one sub-domain per line.
• Combine with tools like Remove Duplicate Lines or Sort Text Lines for extra cleanup steps.
• Useful as a preprocessing step before tools like Collect Sub-domains or Merge Subs & Domains.

❓ Frequently Asked Questions

What does the Clean Sub-domains tool do?

It cleans your sub-domain list by removing duplicate entries and ensuring each line in the result is unique.

How do I clean sub-domains online?

Paste your list, click Clean Sub-domains, and the tool processes and displays counts of input lines, duplicates removed, and the final result. Your cleaned list appears immediately.

Is this tool safe to use?

Yes ✅ All processing happens locally in your browser—nothing is uploaded or stored.