Duplicate remover
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About Duplicate remover
Duplicate Remover strips duplicate lines from any text input and returns only unique lines in their original order. Ideal for cleaning lists, deduplicating log entries, removing repeated keywords, or filtering any newline-separated data.
When to use Duplicate remover
- Remove duplicate entries from a list of email addresses or usernames
- Deduplicate repeated log lines when troubleshooting a noisy error stream
- Clean a list of tags, keywords, or categories with repeated entries
- Remove duplicate package names or file paths from a generated manifest
- Deduplicate any newline-separated export from a database query or spreadsheet column
How it works
The tool splits your input on newlines, then iterates through each line tracking seen values in a Set. The first occurrence of each line is kept; all subsequent occurrences are silently dropped. Empty lines are also removed. The output preserves the original top-to-bottom order of first appearances — no sorting is applied.
Privacy & security
Duplicate remover runs entirely in your browser. No input data is uploaded to any server, stored in a database, or shared with third parties. You can use it offline once the page has loaded.
Frequently Asked Questions
Common questions about this tool.
Is the comparison case-sensitive? ▼
Yes. "Apple" and "apple" are treated as different lines. For case-insensitive deduplication, convert your text to lowercase with the Case Converter tool first, then run it through Duplicate Remover.
Does it preserve the original order? ▼
Yes. The tool always keeps the first occurrence of each duplicate and maintains the original sequence. Lines are never sorted or reordered.
Does it handle Windows line endings (CRLF)? ▼
Yes. Both Unix (LF) and Windows (CRLF) line endings are normalized correctly. The output uses standard Unix newlines.
Is Duplicate remover free to use? ▼
Yes. Duplicate remover is completely free and runs locally in your browser — no account required.
Does Nadhebe upload my data? ▼
No. All processing happens in your browser. Your input data never leaves your device or gets sent to any server.
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