Remove Duplicate Lines

Professional text deduplication. Clean lists, remove repeating lines, sort data, and analyze frequency.

12 lines
Result appears here
0 unique items

Advanced Controls

Auto-updates enabled

Analysis Stats

Total Input
12
Unique Lines
0
Reduction
100%

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Master Your Data: Remove Duplicates Instantly

Whether you are cleaning a massive email marketing list, checking code variables, or organizing a bibliography, duplicate entries can be a disaster. The Remove Duplicate Lines tool is your professional solution for cleaning and organizing text lists in seconds.

Go beyond basic removal. Sort your unique list by Frequency to find top trends, sort Alphabetically for better organization, and use smart features like Ignore Punctuation to catching tricky duplicates that other tools miss. For deeper cleaning, you might also want to Trim Text first.

Why Use This Tool?

  • ✓Advanced Sorting: Order by A-Z, Length, or Frequency count perfectly.
  • ✓Frequency Analysis: See exactly how many times each line appeared.
  • ✓Smart Matching: Ignore whitespace, case, and punctuation for deep cleaning.
  • ✓Privacy Guaranteed: 100% browser-based processing. Your data stays yours.

Features

Instant Deduplication

Clean thousands of lines in milliseconds with optimized browser algorithms.

Powerful Sorting

Sort results by Alphabet, Length, or popularity (Frequency). Find trends fast.

Smart Filters

Options to ignore case, whitespace, 'empty' lines, and punctuation.

100% Private

No server uploads. Your confidential lists never leave your device.

Count & Stats

View occurrence counts next to items and see total lines removed.

File I/O

Upload .txt or .csv files, clean them, and download the unique result instantly.

Common Use Cases

Email Lists

Merging subscribers from multiple sources? deduplicate instantly to save money on your email service provider.

SQL Data Cleaning

Clean up `INSERT` scripts or CSV exports by removing redundant rows before importing into your database.

SEO Keywords

Combine keyword lists from multiple tools and find the unique set. Sort by frequency to see which ones appear most often.

Code & Logs

Analysis log files by collapsing millions of repeated error messages into a single unique list with counts.

Examples

Features Active: Ignore Case, Show Counts, Sort Frequency
Input:
Apple banana APPLE Banana Orange banana
Output:
banana (3) Apple (2) Orange (1)

How to Use

  1. Enter Text: Paste your list or Upload a file. Demo text loads automatically.
  2. Set Rules: Choose to ignore case, whitespace, or punctuation for smarter matching.
  3. Sort & View: Enable Sort by Frequency and Show Counts to analyze your data.
  4. Export: Your clean unique list is ready. click Save to download it.

Frequently Asked Questions

How does this tool detect duplicates?

It scans your list and identifies lines that appear more than once. You can customize detection by choosing to ignore case, whitespace, or punctuation for smarter matching.

Can I see how many times a line appeared?

Yes! Enable the 'Show Duplicate Counts' option. The result will display the line content followed by its frequency count (e.g., 'Apple (3)').

What sorting options are available?

You can sort your unique list in 5 ways: Original Order, Alphabetical (A-Z / Z-A), by Line Length (Shortest/Longest First), or by Frequency (Most/Least Frequent).

Does 'Ignore Punctuation' help with messy lists?

Yes. If enabled, 'Apple' and 'Apple.' will be treated as the same line. This is great for cleaning up data where inconsistent periods or commas might exist.

Can I keep the last occurrence instead of the first?

Absolutely. Use the 'Keep Last' toggle. This ensures that if you sort by 'Original', the version of the duplicate that appeared latest in the file is preserved.

Is my data private?

100% yes. All processing happens in your browser using JavaScript. We never see, store, or upload your text.

Can I process large email lists?

Yes, the tool is optimized for performance and can deduplicate tens of thousands of email addresses or data rows instantly.

Can I download the clean list?

Yes, simply click the 'Save' button to download your unique, sorted list as a .txt file.

What format does file upload accept?

You can upload standard .txt or .csv files. The tool reads them as text and processes every line correctly.

Is this tool free?

Yes, it is completely free, secure, and available 24/7 without any limits.