Text Deduplicator

📖 Tool Introduction

Text Deduplicator is a free, instant online tool that removes duplicate lines from multi-line text, keeping your lists, inventories, rosters and logs clean and tidy. Paste your text into the box and the tool compares every line and keeps unique entries, with repeated lines shown only once. Several practical options are included: Ignore blank lines, so empty lines take no part in comparison or output; Trim spaces, which strips leading and trailing whitespace from each line to catch “fake duplicates” caused by stray spaces; Keep original order, so the deduplicated output follows the source order exactly; and Show counts, which tells you how many times each repeated entry appeared. Whether you are cleaning up a roster exported from Excel, organising a list of saved links, removing duplicated paragraphs while merging documents, or scrubbing duplicate records from scraped data, it gets the job done fast. The result can be copied in one click for immediate use. All processing happens locally in the browser — nothing is uploaded, so your privacy is protected. The interface is clean, supports Simplified Chinese, Traditional Chinese and English following the website language, and works smoothly on desktop and mobile, making it a truly handy efficiency tool for data tidying and everyday office work.

✨ Key Features

• One-click dedup: repeated lines collapse to a single clean entry
• Ignore blank lines: empty lines can be excluded from comparison and output
• Trim spaces: strips leading/trailing whitespace to catch fake duplicates
• Keep order: output follows the original source order exactly
• Repeat counts: optional stats show how many times each entry appeared
• One-click copy: results are ready to use immediately
• Local processing: text never leaves the browser
• Three languages: Simplified Chinese, Traditional Chinese and English

📝 How to Use

1. Paste the multi-line text you want to deduplicate (one item per line)
2. Tick the options you need: ignore blank lines, trim spaces, keep order, show counts
3. Click Deduplicate and the result appears in the output area
4. Click Copy result to use it directly

⚠️ Notes

• Matching rule: duplicates are judged on whole-line equality by default; Trim spaces relaxes leading/trailing whitespace differences
• Case: matching is case-sensitive by default; normalise case first if you want it ignored
• Order: Keep original order is on by default; turning it off still keeps first-appearance order
• Privacy: text is processed locally only, so sensitive rosters are safe to paste