Paste any list, log file, or text block and instantly remove all repeated lines — case-sensitive or case-insensitive, in any order.
When do duplicate lines appear?
Duplicate lines are a common problem when combining data from multiple sources: merging mailing lists, concatenating log files, joining keyword lists, or exporting from databases. Manually scrolling through thousands of lines to spot duplicates is error-prone and time-consuming.
- Email lists combined from multiple campaigns
- Server log files from multiple nodes
- Keyword lists exported from different SEO tools
- Product SKUs collected from different spreadsheets
- Code snippets or config lines copied from multiple files
How to remove duplicate lines online (step by step)
- 1
Open the Remove Duplicate Lines tool
Go to Free Tool Flow → Text Tools → Remove Duplicate Lines.
- 2
Paste your text
Paste any text — a list, a log file, an email dump, or raw keyword data — into the input box. There is no character limit.
- 3
Choose case sensitivity
Toggle 'Case-sensitive' on if 'Apple' and 'apple' should be treated as different. Turn it off to remove both when either appears.
- 4
Click Remove Duplicates
The tool processes your text instantly and shows the deduplicated result with a count of lines removed.
- 5
Copy or download the result
Click 'Copy to Clipboard' for quick use, or 'Download as .txt' to save the cleaned list.
Useful options to know
- Case-insensitive mode — treats 'INFO' and 'info' as the same line.
- Trim whitespace — removes leading/trailing spaces before comparing, so ' apple ' and 'apple' are treated as duplicates.
- Preserve order — keeps lines in original order (removes later duplicates). Or sort alphabetically.
- Show count — displays how many duplicate lines were removed.
Frequently asked questions
How do I remove duplicate lines from text for free?
Use Free Tool Flow's Remove Duplicate Lines tool. Paste your text, choose case sensitivity, and click the button. The result is instant and free — no account needed.
Is there a character or line limit?
No. The tool runs in your browser and handles very large text files. There is no server-side limit because no data is uploaded.
Can I remove duplicate lines in Excel instead?
Yes — Excel has a 'Remove Duplicates' feature for columns. But for plain text lists, Free Tool Flow is faster since Excel requires formatting the text as a table first.
What is the difference between 'remove duplicates' and 'deduplicate'?
They mean the same thing: keeping only the first (or unique) occurrence of each line and discarding repeated copies.