Duplicate Line Remover

How to use

1. 1Paste your list into the input box, one item per line by default. Use a quick preset (Default, Case-insensitive, CSV row, Show only uniques) to jump to a common setup.
2. 2Pick a split mode if your items are not separated by line breaks: commas, semicolons, tabs, any whitespace, or a custom delimiter.
3. 3Choose a duplicate strategy: keep the first occurrence, keep the last occurrence, or drop everything that appears more than once.
4. 4Toggle the comparison rules to match how strict you want the dedupe to be: trim items, ignore case, collapse internal whitespace, ignore punctuation, drop blanks.
5. 5Pick an output order (input order, A to Z, Z to A) and a join mode so the result is shaped for wherever you are pasting it next.
6. 6Check the statistics and the most-frequent duplicates panel, then click Copy output or Download .txt to save the unique list.

About this tool

Duplicate Line Remover takes any list you paste in and returns only the unique items, with full control over how duplicates are matched and which copy survives. The default settings handle the common case: one item per line, trim whitespace, drop blanks, keep the first occurrence. From there you can choose a different split mode (commas, semicolons, tabs, whitespace, or your own delimiter) for inputs pasted from a CSV row, a SQL clause, an environment variable, or a chat message; a different join mode for the output so the result drops into the next field cleanly; and a different strategy when a duplicate appears (keep first, keep last, or remove every copy so only items that occurred exactly once survive). Comparison rules let you fold case so Email, EMAIL, and email are treated as the same item, collapse runs of internal whitespace so 'New York' and 'New York' match, strip punctuation and symbols so example.com and example-com line up, drop blank lines, and trim leading or trailing spaces before matching. The output can be left in input order, sorted A to Z, or sorted Z to A using a locale-aware natural compare so file2 lines up before file10. A live statistics panel shows the input count, the unique count, how many duplicates were removed, and how many blanks were dropped, with a most-frequent-duplicates list that surfaces the entries that appeared more than once and how often, so you can audit what was removed before you copy. Useful for cleaning up email lists, deduping log lines, finding unique IP addresses or URLs in a dump, condensing a list of keywords, prepping a SQL IN clause, building distinct values from a CSV column, and turning a messy paste from a spreadsheet into a clean list. Everything runs locally in your browser. Inputs are never uploaded, logged, or shared.

Free to use. Works in your browser. No signup, no login.