Text Deduplicator
Remove duplicate lines
Tool Guide
Introduction
The online text deduplication tool quickly removes duplicate items from a list, keeping only unique entries. Paste your data line by line, click once to deduplicate, and instantly see before/after counts to evaluate the result.
Core Features
- Line-by-line dedup: Treats each line as one item, automatically detects duplicates, and keeps only the first occurrence.
- Batch processing: Handles large blocks of text in one pass, dramatically reducing manual effort.
- Copy & download: Results can be copied to clipboard or downloaded as a TXT file for use in Excel, databases, or other tools.
How to Use
Step 1: Paste the text to be processed into the input box — one item per line.
Step 2: Click "Start Dedup" to automatically remove duplicate lines.
Step 3: Review the deduplicated list and the before/after counts in the result area.
Step 4: Copy the result or download it as a TXT file as needed.
Use Cases
Client list cleanup: Quickly remove duplicate names or IDs from mailing lists.
Keyword library cleaning: Eliminate redundant keywords from SEO keyword lists.
Scraped data dedup: Clean up duplicate URLs, titles, or entries collected by crawlers.
Log record organization: Remove repeated entries from log files.
Data pre-processing: Deduplicate before importing into a database or spreadsheet.
FAQ
Q: Does it ignore case when deduplicating?
A: By default, exact matching is used — different cases are treated as different items. Enable the "Ignore case" option before deduplicating.
Q: Are empty lines included in deduplication?
A: Yes. Empty lines are treated as data items and included in deduplication. Enable the "Ignore empty lines" option to skip them.
Q: How do I count how many times each item repeats?
A: This tool focuses on deduplication only. For frequency counting, use a text frequency statistics tool.