حذفکننده خط تکراری
Paste a list of lines to instantly remove duplicates — with options for case sensitivity, whitespace trimming, and sorting.
Input
Output
Updates instantly as you type.
نظرات
Everything you need to know about Duplicate Line Remover
How duplicate detection works, what each option does, and where this tool comes in handy.
- Paste your lines and duplicates are removed instantly, keeping the first copy of each.
- Everything runs locally in your browser — nothing you paste is ever uploaded.
- Turn on "Ignore case" and "Trim whitespace" for messier lists, like exported data.
How to use Duplicate Line Remover
- Type or paste the list of lines you want to clean up into the input box.
- Toggle case sensitivity, whitespace trimming, blank-line removal, or sorting as needed.
- The deduplicated list appears instantly — copy it or download it as a text file.
Why remove duplicate lines
Exported lists, merged spreadsheets, and copy-pasted data often end up with repeated entries — duplicate emails, repeated log lines, the same URL pasted twice. Scanning for and deleting them by hand is slow and error-prone once a list gets past a few dozen lines.
This tool checks every line against the ones before it and keeps only the first occurrence, instantly, in your browser — with options to handle messy formatting along the way.
What each option does
| Option | بهترین برای | چرا ارزش بررسی دارد |
|---|---|---|
| Ignore case | Lists with inconsistent capitalization | Treats "Apple" and "apple" as the same line. |
| Trim whitespace Good default | Copy-pasted or exported data | Catches duplicates that only differ by stray leading/trailing spaces. |
| Remove blank lines | Cleaning up gaps left by editing | Strips empty lines in addition to duplicates. |
| Sort alphabetically | Lists you want in a predictable order | Reorders the result instead of preserving original order. |
Duplicate Line Remover without uploading anything
The text you paste is read directly by JavaScript running in your browser tab, deduplicated on the spot, and shown back to you — it's never transmitted to a server, logged, or stored.
Because there's no upload involved, there's no practical length limit beyond what your browser's memory can comfortably handle.
Your text never leaves your device. Deduplication is pure client-side JavaScript, with nothing logged or stored.
Need to standardize capitalization first? The Case Converter tool can help before you dedupe.
Keeping the first vs. the last occurrence
| Approach | بهترین برای | مبادله، مصالحه، سازش |
|---|---|---|
| Keep first occurrence This tool | Preserving your original order | Matches how most people expect deduplication to work. |
| Keep last occurrence | Logs where the newest entry should win | Requires reversing the list first, then reversing the result back. |
If you specifically need the last occurrence kept instead, reverse your list before pasting it in, run the tool, then reverse the result — the "keep first" logic will then effectively keep the last entry from your original order.
What people use Duplicate Line Remover for
- Email & contact listsCleaning up duplicate addresses before an import or send.
- Log analysisTrimming repeated lines out of exported log files.
- URL & link listsRemoving repeated links from a scraped or copy-pasted list.
- Spreadsheet cleanupDeduplicating a pasted column before pasting it back.
- Keyword & tag listsCleaning up merged keyword or tag lists for SEO or content work.
این ابزار چگونه کار میکند
Deduplication runs live in your browser via JavaScript: each line is checked against the ones already seen and only new lines are kept — nothing is uploaded, stored, or logged.
آخرین بهروزرسانی: ۱۴ سپتامبر ۲۰۲۶.
آیا این راهنما مفید بود؟
ابزارهای بیشتر در جعبه
چهارده ابزار رایگان دیگر بدون نیاز به کلید API در صفحهٔ اصلی قرار دارند.
شمارشگر کلمات
شمارش زندهٔ کلمات، کاراکترها، جملات و پاراگرافها.
تغییر اندازه تصویر
تغییر اندازه تصاویر JPG، PNG و WEBP بر حسب پیکسل یا درصد.
تصویر به PDF
تصاویر را در یک فایل PDF قابل دانلود واحد ترکیب کنید.
قالببندی JSON
JSON را زیبا، کوچک و با سرنخهای خطا اعتبارسنجی کنید.
تولیدکننده رمز عبور
کلمات عبور تصادفی قوی با قوانین سفارشی.