Remove Duplicate Lines
Paste any list and we'll strip out the duplicates - case-sensitive or not, order preserved or sorted.
Paste your list, pick a comparison mode, and we'll return a deduplicated copy. Useful for cleaning up emails before a mail-merge, deduping a column copied from a spreadsheet, or trimming a list of slugs / URLs. Everything happens in your browser - the text never leaves your device.
6 lines in, 4 unique out (2 removed)
How to use it
Paste your text
One entry per line. Tabs and commas inside a line stay intact.
Pick comparison options
Case sensitivity, whitespace handling, and preserve-vs-sort.
Copy the cleaned list
The output appears in the right pane. Hit Copy to grab it all at once.
What is it?
A duplicate-line remover takes a block of text and returns a version where every line appears at most once. The compare-and-keep step is the only logic; the variations are in how 'same' is defined - case, whitespace, and order policy all change the output.
When to use it
Cleaning up an email export before a mail-merge. Deduping a column pasted from a spreadsheet. Reducing a list of tags, slugs or URLs to its unique set. Building a vocabulary list from a body of text after one line per word. Any time a copy-paste loop or a script dump left you with redundant rows.
Common mistakes
Forgetting that case matters by default - 'gmail.com' and 'Gmail.com' are different lines until you toggle case-insensitive. Mixing tab-separated and comma-separated rows in the same input - the tool treats one line as one entry regardless of internal punctuation. And losing the original order when alphabetical sort is on; switch back to 'preserve order' if the input had meaningful sequence.
FAQ
- Is the comparison case-sensitive by default?
- Yes. Toggle case-insensitive when you want Apple, apple and APPLE treated as one entry.
- What about leading or trailing whitespace?
- Off by default - ' apple' and 'apple ' count as different lines. Enable 'trim whitespace' to ignore it.
- Does it preserve the original order?
- Yes by default. The first occurrence of each unique line stays in place. Switch to 'sort alphabetically' if you want a clean A-Z list out.