Remove Duplicate Lines

Remove Duplicate Lines strips repeated lines from a list, with options for case sensitivity, keeping the original order or sorting, and counting occurrences. It is for cleaning up lists of emails, keywords, logs, or any line-based data.

Duplicate entries skew counts and clutter lists. Removing them locally is instant and keeps potentially sensitive lists off any server.

1. Paste the lines you want to de-duplicate.
2. Choose whether matching should be case-sensitive.
3. Decide whether to keep the original order or sort the result.
4. Optionally show how many times each line appeared.
5. Copy the cleaned list.

• Case-sensitive or insensitive matching
• Keep original order or sort the result
• Optional occurrence counts
• De-duplicated in the browser

• De-duplicating an email or contact list
• Cleaning a keyword list for SEO
• Removing repeated entries from log output
• Tidying a list before import into another system

• Trim stray spaces first so near-identical lines are recognised as duplicates.
• Use case-insensitive matching for emails and URLs, which are not case-sensitive in practice.
• Keep occurrence counts on when you need to know which entries repeated most.

• Leaving case sensitivity on when “Email@x.com” and “email@x.com” should be treated as the same — switch it off to merge them.
• Sorting when the original order carried meaning; keep order if sequence matters.
• Ignoring trailing spaces, which make otherwise identical lines look different.