Delete repeated lines from a list and keep only unique entries.
Processed locally in your browser.
How do you remove duplicate lines from a list?
Each line is compared to those seen before, and only the first occurrence is kept while the original order is preserved. Trimming and case-insensitivity change how lines are considered equal. For example, "Apple, apple, Banana, Apple" becomes "Apple, apple, Banana" — or just "Apple, Banana" with ignore-case turned on.
Understanding your result
Order is preserved by default. The summary shows how many duplicate lines were removed.
Formula and method
Each line is compared to those seen before; only the first occurrence is kept. Trimming and case-insensitivity change how lines are considered equal.
Assumptions and limitations
Duplicates are matched line by line as whole lines, not by fuzzy similarity, so entries that differ by a stray character remain separate. Enabling trim or ignore-case widens what counts as identical, but near-matches, typos and reordered words are not detected. Everything is processed locally in your browser.
Worked example
A list with “Apple, apple, Banana, Apple” becomes “Apple, apple, Banana” — or just “Apple, Banana” with “ignore case” on.
How to use this tool
- Paste your lines.
- Choose trim and case options.
- Copy the cleaned result.
Common mistakes to avoid
- Forgetting that trailing spaces can make otherwise-identical lines look different — enable trim.
About the Remove Duplicate Lines
Strip repeated lines from a list while keeping the first occurrence and the original order.
Who should use this tool
Anyone tidying lists: marketers cleaning email exports, developers deduplicating logs or config entries, and researchers consolidating collected data. If you have a text list where the same line appears more than once and you want to keep only unique entries while preserving the order you pasted them in, this handles it in one click.
Benefits
- Keeps the first occurrence and the original line order
- Reports how many duplicate lines were removed
- Optional trimming and case-insensitivity for looser matching
- Processes long lists locally without uploading anything
Practical use cases
- Cleaning a mailing list exported with repeated addresses
- Deduplicating a collected list of keywords or tags
- Removing repeated entries from copied log output
- Consolidating names gathered from several sources
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Frequently asked questions
Does it keep the order?
Yes. The first occurrence of each line stays in place.
Does it treat differently capitalised lines as duplicates?
By default no, so Apple and apple are kept as separate lines. Turn on the ignore-case option and they are treated as identical, leaving only the first. This lets you choose between strict, exact matching and a looser comparison depending on your list.
Are lines with extra spaces counted as the same?
Only if you enable trimming. Without it, a line with leading or trailing spaces differs from the same text without them and both are kept. With trimming on, the edges are ignored during comparison, so surrounding whitespace no longer prevents a match.