Web Analytics

 Duplicate Lines Remover

Clean and optimize your text by detecting and removing duplicate lines. This duplicate lines remover keeps the first occurrence, preserves original order, and supports optional settings like ignore case, trim whitespace for comparison, and remove all empty lines. All processing runs in your browser.

Options
Highlighted lines are duplicates based on the current comparison settings.

⭐ About Duplicate Lines Remover

The Duplicate Lines Remover cleans multiline text by removing repeated lines while preserving the original order. It keeps the first occurrence of each line and removes only exact duplicates based on your selected comparison settings.

⭐ What this duplicate lines remover does

  • Analyzes input text line by line
  • Identifies duplicate lines using exact matching by default
  • Keeps only the first occurrence of each duplicate line
  • Preserves original order of the remaining lines
  • Does not modify line content in the output

⚙️ Optional settings

  • Ignore case when comparing lines - treats Line and line as duplicates
  • Trim leading and trailing whitespace before comparison - compares lines after trim while keeping original output content
  • Remove all empty lines - removes blank lines entirely

🔎 How to use

  1. Paste multiline text or upload a TXT file.
  2. Enable optional comparison settings if needed.
  3. Review the cleaned output instantly.
  4. Copy or download the cleaned text.

🔎 Example

Input:

Apple
Banana
Apple
banana
Banana

Default output (case-sensitive):

Apple
Banana
banana

Output with Ignore case enabled:

Apple
Banana

⚠️ Notes

  • By default, comparison is case-sensitive.
  • Empty lines are preserved unless they are duplicates or you enable remove empty lines.
  • All processing happens locally in your browser.

This tool is also known as

  • how to remove duplicate lines online
  • remove duplicate lines while keeping order
  • remove duplicate lines from large text
  • free duplicate line remover
  • online text deduplication tool

Frequently Asked Questions

It removes duplicate lines from multiline text and keeps the first occurrence of each line while preserving original order.

By default, duplicates are detected as exact line matches with case-sensitive comparison.

Yes. The tool keeps the original order of lines that remain after duplicate removal.

No. Output lines are not reformatted, corrected, or trimmed. Original line content is preserved.

Yes. Enable Ignore case to treat lines like "Apple" and "apple" as duplicates.

Yes. Enable trim comparison to compare lines after removing leading and trailing spaces.

Yes. Enable Remove all empty lines to delete blank lines from the output.

Yes. Empty lines are preserved unless they are exact duplicates beyond the first or you enable remove empty lines.

Yes. You can upload a TXT file and the content is processed directly in the browser.

Yes. Use Copy to copy results or Download .txt to save the cleaned text file.

No. Processing runs entirely in your browser and your text is not uploaded.

Our data tools

General
JSON Tools
List tools
Search & filter
Add & remove
Line tools
Chart tools
CSV tools