ページを読み込んでいます
Remove duplicate lines from text. Keeps the first occurrence of each line and deletes subsequent duplicates.
Paste or type the text containing duplicate lines you want to remove into the input area.
Enable 'Ignore case' if you want to treat lines like 'Hello' and 'hello' as duplicates.
Review the result with duplicates removed and click 'Copy' to copy it to your clipboard.
Duplicate Line Remover is an online tool for cleaning up duplicate lines from lists and data. It automatically detects duplicate lines and keeps only the first occurrence. Case-insensitive matching is available, making it useful for mailing lists, log analysis, and data cleanup.
The first occurrence of each line is kept, and all subsequent identical lines are removed. This preserves the original order of unique lines.
When 'Ignore case' is enabled, lines like 'Hello' and 'hello' are treated as duplicates. In case-sensitive mode, they are treated as different lines.
To maintain performance, there is a character limit on input. For very large files, we recommend splitting them into smaller sections.
Blank lines (empty lines) are also subject to deduplication. If there are multiple blank lines, only one will be kept.
No, all processing is done locally in your browser. Your text is never sent to external servers, so you can safely work with confidential content.