Duplicate Line Remover - Free Online Tool | PivaBox

Find and remove duplicate lines from your text with fuzzy matching support

How to Use Duplicate Line Remover

  1. Paste or type your text into the input area — enter one item per line
  2. Choose your options: Case Sensitive for exact matching, Trim Whitespace to clean up spaces, Show Duplicate Count to see how many times each line appeared, or Fuzzy Match to catch similar lines with a similarity threshold
  3. Select a mode (Remove Duplicates, Mark Duplicates, or Only Show Duplicates), click Process, then copy the result or Download as .txt

Frequently Asked Questions

Is Duplicate Line Remover free?

Yes, PivaBox Duplicate Line Remover is completely free. All processing happens locally in your browser — no data is ever uploaded to a server.

How does fuzzy matching work?

Fuzzy matching uses the Levenshtein distance algorithm to calculate text similarity. Adjust the slider from 0% to 100% — higher values require more exact matches. At 100%, only identical lines are matched; at lower values, similar lines (like typos or minor variations) are considered duplicates.

What are the different modes?

Three modes are available: <strong>Remove Duplicates</strong> keeps only the first occurrence of each line, <strong>Mark Duplicates</strong> adds a [DUPLICATE] prefix to repeated lines while keeping all lines, and <strong>Only Show Duplicates</strong> shows only the lines that appear more than once.