Find duplicate lines and words in a list
Paste a list and see which entries repeat and how many times — emails, SKUs, names, anything one-per-line. It counts on your device (0 uploads, works offline).
How to use it
- Paste your list, one item per line.
- The duplicates appear, most-repeated first, with a count each.
- Copy or download the report.
FAQ
How do I find duplicates in a list online for free?
Paste the list on this page and every repeated line is shown with how many times it appears, counted in your browser with no upload. Comparison ignores case by default, so Priya@x.com and priya@x.com count as the same entry.
Does it change my list?
No — it only reports. To actually remove duplicates, use the line tools "Remove duplicates" operation.
Is my list uploaded?
No. Everything is counted locally and nothing is stored; it works offline.
Can it find duplicate words rather than lines?
Yes — the engine supports word-level counting, useful for spotting repeated words in prose.
Limits
Blank lines are ignored. Very large lists stay responsive because counting is a single pass.
Related
Line tools remove the duplicates once you have found them; the word counter measures the list as text.
Bookmark this page (Ctrl+D, or ⌘D on Mac) or install the app — it works offline the next time you need it.