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Text CleanerBuild a reusable cleanup pipeline for untidy text and lists.Remove Duplicate LinesDeduplicate lines while controlling case, whitespace, order, and blanks.Remove Empty LinesDelete blank rows or collapse them while preserving paragraph structure.Trim WhitespaceRemove unwanted leading or trailing whitespace with indentation control.Remove Extra SpacesNormalize repeated spaces, tabs, and non-breaking spaces safely.Sort LinesSort text alphabetically, naturally, numerically, or by length.Add Prefix and SuffixWrap, number, or punctuate every line with practical presets.Delimiter ConverterConvert lists between lines, commas, tabs, pipes, and custom separators.Compare Two ListsFind unique, shared, and duplicated items across two lists.Find and ReplaceReplace plain text or guarded regular-expression matches.

Lists and comparison

Remove Duplicate Lines

Create a clean unique list without losing the original first occurrence.

Processed locally in your browser. Your data is never uploaded or stored.
Processed locally in your browser. Your data is never uploaded or stored.

Ready

Input0 lines · 0 characters
Output0 lines · 0 characters
OptionsAdjust how this tool processes your text
Remove Duplicate Lines options
Press Ctrl/Cmd + Enter to process

Keep tidying

Text cleanupText Cleaner

Build a reusable cleanup pipeline for untidy text and lists.

Open tool →Lists and comparisonSort Lines

Sort text alphabetically, naturally, numerically, or by length.

Open tool →Lists and comparisonCompare Two Lists

Find unique, shared, and duplicated items across two lists.

Open tool →

What this tool does

A focused tool for a specific cleanup job

This tool compares one line at a time, keeps the first matching line, and reports exactly how many duplicates were removed. Matching rules are independent from output formatting.

Common use cases

  • Remove repeated SKUs from an export
  • Deduplicate email or keyword lists
  • Clean copied form submissions
  • Prepare a distinct list while retaining source order

How to use Remove Duplicate Lines

  1. Paste one item per line.
  2. Choose whether capitalization and surrounding whitespace affect matching.
  3. Keep the original order or sort the final unique list.
  4. Copy or download the deduplicated result.

Options explained

  • Case-insensitive matching treats Apple and apple as the same key.
  • Ignore surrounding whitespace matches padded and unpadded versions without rewriting the kept line.
  • Retain empty lines keeps at most one matching blank line.
  • Sort result runs after deduplication.

Example

Before
Alpha
Beta
alpha
Beta
After
Alpha
Beta

Edge cases and limitations

  • Unicode characters are compared using browser string rules.
  • Visually similar characters may still be different code points.
  • The first matching line is the one preserved.

Questions

Remove Duplicate Lines FAQ

Can I ignore capitalization?

Yes. Turn off case-sensitive comparison to match uppercase and lowercase variants.

Will the tool reorder my list?

Not unless you enable sorting. Original order is preserved by default.