Duplicate Line Highlighter
Highlight every line that appears more than once in text, without removing or altering anything, with a duplicate count.
Distinct Lines With Duplicates
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Paste some text to see duplicate lines highlighted here.
How to Use the Duplicate Line Highlighter
Paste multi-line text into the box, and the tool identifies every line that appears more than once in your input. The full text is rendered back exactly as entered on the right, with every duplicate line given a colored highlight so you can spot them at a glance — nothing is removed or altered. A count shows how many distinct lines have at least one duplicate.
Example
Pasting a list where "apple" and "banana" each appear twice highlights both lines every time they occur, and reports "2 distinct lines with duplicates," while unique lines like "cherry" stay unhighlighted.
Common Use Cases
- Reviewing a list before deciding whether duplicates are actually meaningful or accidental.
- Spotting repeated log lines, entries, or rows without automatically deleting anything.
- Proofreading a dataset or list for accidental copy-paste repeats before cleaning it up.
FAQs
- How is this different from Remove Duplicate Lines? Remove Duplicate Lines DELETES duplicate lines automatically, keeping only the first occurrence. This tool just visually flags duplicates in place, leaving every line untouched, so you can review them before deciding what — if anything — to do.
- Are empty lines treated as duplicates? No — blank lines are never highlighted, even if there are several in a row, since flagging every blank line as a duplicate usually isn't useful.
- Is the comparison case-sensitive? Yes — lines are compared exactly as typed, so "Apple" and "apple" are treated as different lines and won't be flagged as duplicates of each other.