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Text toolsRemove Duplicate Lines
Remove repeated lines while keeping their first occurrence.
Processed locally in your browser — your text is not uploaded.Loading your tool…
How to use Remove Duplicate Lines
- Paste one item per line.
- Choose whether to ignore case and surrounding whitespace.
- Remove duplicates and copy or download the result.
Which duplicate is kept?
The first occurrence is kept. Case and surrounding-whitespace options only control comparison.
No sign-up is required. The calculation or transformation happens in this browser tab and the result is available immediately.
A useful next step
Cleaning and validating data locally in your browserSeparate syntax checks, text cleanup, encoding and integrity verification while keeping working data in the browser.Good to know
Can I undo a transformation?+
The original input remains while the result appears separately.
What is the text limit?+
Text tools accept up to 1,000,000 characters, subject to browser memory.
Is my content uploaded?+
No. Processing happens in this browser tab and the tool does not send your content to a server.