This tool lists the lines that appear more than once in your text, so you can spot repeats — computed in your browser.
How to use it
- Paste your list or data.
- Repeated lines are identified.
- Copy the list of duplicates.
About Duplicate Line Finder
Sometimes you don't want to remove duplicates — you want to find them. This tool reports each line that appears more than once, which is useful for auditing data, spotting accidental repeats and checking uniqueness constraints. It lists each duplicated line a single time and runs entirely in your browser.
FAQ
Does it show how many times a line repeats?
It lists each duplicated line once; use the word/line frequency tools for counts.
Is it case-sensitive?
Yes — lines must match exactly to be flagged as duplicates.
How do I remove the duplicates?
Use the remove-duplicate-lines tool to keep only unique lines.