Runs fully in your browser. Inputs stay on your device. See recent fixes on changelog.
Remove Duplicate Lines
Remove duplicate lines from text keeping unique entries.
FreeRuns in browserremove duplicate linesunique lines
0 chars
Cmd/Ctrl+Enter Primary actionCmd/Ctrl+Shift+L Load sampleCmd/Ctrl+Shift+X Clear/resetCmd/Ctrl+Shift+C Copy result
About Remove Duplicate Lines
Remove duplicate lines from text keeping unique entries. Remove duplicate lines from text online for free. Keep unique lines only with case-sensitive or case-insensitive deduplication modes. No signup needed. Handles Unicode text correctly, including emoji and multi-byte characters. Processes text instantly in your browser with no practical size limits. Everything runs client-side in your browser for maximum speed and privacy — no data is sent to any server, and no signup is required.
Related tools: Sort Lines, Remove Empty Lines, Remove Duplicates from List
How to Use Remove Duplicate Lines
- Paste or type your text into the input area.
- Select the transformation you want to apply.
- Copy the transformed result from the output area.
Frequently Asked Questions
What is Remove Duplicate Lines?
Remove duplicate lines from text online for free. Keep unique lines only with case-sensitive or case-insensitive deduplication modes. No signup needed.
Does the tool preserve formatting?
The tool preserves whitespace, line breaks, and structural formatting while applying the selected transformation. Only the targeted text characteristics are changed, leaving your overall layout intact.
Can I process large texts?
Yes, because all processing happens in your browser there are no server-imposed size limits. Performance remains fast for texts up to several hundred thousand characters on modern devices.
What character encodings are supported?
The tool handles Unicode text correctly, including emoji, accented characters, and multi-byte scripts such as Chinese, Japanese, and Arabic. Any text that your browser can display can be transformed.
Is Remove Duplicate Lines free to use?
Yes, this text tool is entirely free. There is no signup, no account required, and no limit on how much text you can process.
Is my data safe when using Remove Duplicate Lines?
Yes, all text processing happens locally in your browser. Your text is never sent to any server, so your content remains completely private and secure.