Is this remove-duplicate-lines tool free?
Yes. Removing duplicate lines is free, with no account or sign-up.
Is my text uploaded anywhere?
No. The tool dedupes lines entirely in your browser, so your text stays on your device and is never uploaded.
Does it reorder the lines?
No. It preserves the first-seen order and only removes later duplicates, so the sequence of unique lines stays intact.
Can I export the cleaned result?
Yes. The deduped text is both copyable and downloadable once the duplicates are removed.
Does it tell me how many duplicates were removed?
Yes. The tool counts and shows how many duplicate lines it removed from your text.
Why are there still duplicates in my output?
Because they are not duplicates as far as the tool is concerned. The comparison is exact, so a trailing space, a leading tab, a different capital letter or a non-breaking space makes two visually identical lines into two different strings. Run the text through Remove Extra Spaces first, which trims each line, and then dedupe.
Does it change the order of my lines?
No. The first time a line appears it is kept in place, and every later copy is dropped. Nothing is sorted and nothing is moved, so a priority-ordered list or a chronological log keeps its structure. If you want sorted output, run Sort Lines afterwards.
Is the comparison case-sensitive?
Yes. Email@example.com and email@example.com are treated as two distinct lines and both are kept. For a list where case is not meaningful, such as email addresses or URLs, convert to lowercase first and then dedupe, or you will be left with duplicates that differ only in capitalisation.
What happens to my blank lines?
The first one survives and the rest are removed, because an empty line is another string that has already been seen. If your text used blank lines as paragraph separators, they will collapse to a single blank line at the first occurrence and disappear thereafter. Use Remove Empty Lines if you want them all gone deliberately.
Can I dedupe a CSV by one column?
Not here. The tool compares whole lines, so two CSV rows that share an email but differ in any other field are both kept. Extract the single column you care about with the CSV Column Extractor, dedupe that, and use the result as a lookup.
Is the text uploaded?
No. Deduplication is done with a Set in the page, so nothing is sent anywhere and the operation is effectively instant even on long lists.