Duplicate Line Remover
Duplicate Line Remover: free, instant and private. Matching is on the trimmed line, so trailing spaces do not create a false duplicate — but "Delhi" and "delhi" are treated as different entries.
How the Duplicate Line Remover works
The Duplicate Line Remover takes Lines and returns the answer instantly — no button to hunt for, no page reload. Matching is on the trimmed line, so trailing spaces do not create a false duplicate — but "Delhi" and "delhi" are treated as different entries. The original order is preserved.
Enter your own numbers to replace the example values; the result panel updates as you type. Everything runs in this single page, so nothing you enter leaves your device.
Formula used
keep the first occurrence of every line, drop the rest (case-sensitive)
| Symbol | Meaning |
|---|---|
| input | a list with duplicate entries, one per line |
Matching is on the trimmed line, so trailing spaces do not create a false duplicate — but "Delhi" and "delhi" are treated as different entries. The original order is preserved.
Inputs used: Lines.
Worked example
Take the default example — lines of apple banana apple cherry banana date:
- output: apple banana cherry date
- removed: 2
Frequently asked questions
- What formula does the Duplicate Line Remover use?
- It uses keep the first occurrence of every line, drop the rest (case-sensitive), where input is the a list with duplicate entries, one per line.
- Is the Duplicate Line Remover free?
- Yes. There is no signup, no usage limit and no watermark — the formatter runs entirely in your browser.
- How do I read the result?
- Matching is on the trimmed line, so trailing spaces do not create a false duplicate — but "Delhi" and "delhi" are treated as different entries. The original order is preserved.
- Does the Duplicate Line Remover store or send my data?
- No. Every calculation happens locally in the page, so the numbers you type are never uploaded or logged.
- Does it work on a phone and offline?
- Yes — the page is a single lightweight file that adapts to any screen size. Once it has loaded it keeps working without a network connection.