Duplicate Line Remover

Remove duplicate lines, keep only unique lines or extract duplicates from your text. Ideal for cleaning email lists, logs, CSV exports, code snippets and large text files.

Matching options
Case sensitive
Ignore leading/trailing spaces
Ignore empty lines
These options affect how lines are compared when detecting duplicates.
Sorting options

Sorting does not change how duplicates are detected. It only rearranges the current text.

Sorting uses the text from the result box if available, otherwise from the input.
Original Text (one item per line)
Processed Text
Total lines (active text)
0
Unique lines (by settings)
0
Duplicate lines (by settings)
0
Empty lines
0

Free Online Duplicate Line Remover

The Duplicate Line Remover from PowerSEOTools.online helps you quickly clean up lists, logs and large blocks of text. Instead of manually hunting down repeated lines, you can remove or filter duplicates in seconds using smart matching options.

Why Remove Duplicate Lines?

Duplicate lines are common when you copy data from multiple sources, export reports, merge lists or work with logs. They can cause inaccurate counts, broken imports and confusion when analysing information. Removing duplicates helps you:

  • Clean email lists before importing into marketing tools.
  • Deduplicate usernames, IDs or product codes.
  • Reduce noise in log files and error reports.
  • Prepare clean datasets for spreadsheets, scripts and automations.

Flexible Matching Options

This tool gives you precise control over how duplicates are detected:

  • Case sensitive: Decide whether “Test” and “test” should be treated as the same line or different lines.
  • Ignore leading/trailing spaces: Avoid treating “hello” and “hello  ” as different because of extra whitespace.
  • Ignore empty lines: Skip completely blank lines when counting and removing duplicates.

Available Actions

  • Remove Duplicate Lines (keep first): Keeps the first occurrence of each line and removes subsequent duplicates.
  • Keep Unique Lines Only: Keeps only lines that appear once and discards any lines that appear multiple times.
  • Keep Duplicates Only: Keeps only lines that appear more than once, which is useful for finding problematic entries.
  • Sort A → Z / Z → A: Quickly sort lines alphabetically without changing how duplicates are counted.

How to Use the Duplicate Line Remover

Using the tool is straightforward:

  • Paste or type your list into the Original Text box, one item per line.
  • Adjust the matching options (case sensitivity, whitespace and empty lines) if needed.
  • Choose an action such as Remove Duplicate Lines or Keep Unique Lines Only.
  • View the cleaned list in the Processed Text box.
  • Use Copy Result to copy the output, Swap to continue editing the cleaned version or Download to save it as a text file.

Privacy-Friendly, Browser-Based Processing

All operations run locally in your browser using JavaScript. Your text is never uploaded, logged or stored on our servers, so it is safe to use this tool with email lists, customer IDs, internal data and other sensitive information.

Combine With Other PowerSEOTools.online Text Utilities

After cleaning your data with the Duplicate Line Remover, you can use other tools on PowerSEOTools.online to refine it further. For example, use Remove Line Breaks to reformat content, the Character Counter and Word Counter to check length, or the Find & Replace Text tool to update values in bulk.