Remove Duplicate Lines
Remove duplicate lines from a list of text.
Processed locally in your browser. Your text is never uploaded.
- Keeps the first occurrence of each line and drops the rest, preserving order.
- Optional case-insensitive matching and whitespace trimming before comparing.
- Handles long lists in the browser — no upload, no row limit beyond your device's memory.
Why this is private
- Processed locally in your browser. Your text is never uploaded.
- Open your browser's DevTools → Network tab while using this tool — you won't see a request carrying your input, because it never leaves your device.
- Nothing you enter is uploaded to a server or shared with us — the processing happens entirely on your device.
Overview
Removes duplicate lines from a block of text, keeping the first occurrence of each unique line.
How to use it
- 1Paste text with one item per line.
- 2Optionally ignore case and trim whitespace when comparing.
- 3The de-duplicated list appears instantly — copy it out.
Frequently asked questions
What people use it for
Clean a mailing or subscriber listStrip repeated addresses before importing into an email tool.
Tidy a keyword listRemove duplicate search terms exported from a keyword tool.
Collapse repeated log linesReduce a noisy log paste to the set of distinct messages.
De-duplicate a single CSV columnPaste one column of values and get the unique set.
Related tools
All text toolsText Diff CheckerCompare two blocks of text at line, word or character level, with an ignore-whitespace option.Word CounterCount words, characters, sentences and reading time instantly, with a readability score and writing goal tracking.Case ConverterConvert text to UPPERCASE, lowercase, Title Case, kebab-case and more.Character CounterCount characters with and without spaces, live.
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Remove Duplicate Lines