Remove Duplicate Lines
Remove duplicate lines while keeping the original order.
About Remove Duplicate Lines
Remove Duplicate Lines is a practical cleanup tool for turning messy lists into clean, unique lists without losing the original order. Paste keywords, URLs, names, emails, product codes, notes or any line-based content, and the tool removes repeated lines while keeping the first occurrence exactly where it appeared. This is useful for SEO keyword lists, spreadsheet exports, contact cleanup, inventory notes, redirects, sitemap checks, research lists and development notes. You can choose case-sensitive matching when uppercase and lowercase versions should be treated as different entries. When the option is off, lines such as Apple and apple are treated as duplicates, which is often better for human-readable lists. The output is easy to copy and reuse in documents, spreadsheets, CMS fields or code editors. The tool avoids unnecessary formatting changes so your list remains predictable. It works fully in the browser and helps reduce manual cleanup work when duplicate rows keep sneaking into your text.
How to use Remove Duplicate Lines?
- Paste your line-based list into the text area.
- Enable case-sensitive matching if uppercase and lowercase lines should be different.
- Click Process Text.
- Review the unique output and removal summary.
- Copy the cleaned text for reuse.
- Open the tool page and read the input labels carefully.
Remove Duplicate Lines Features
- Remove repeated lines
- Case-sensitive matching option
- Keep original order
- Show original, unique and removed line counts
- Copy cleaned output
Remove Duplicate Lines FAQs
Does this tool keep the first duplicate line?
Yes, the first occurrence is kept and later duplicate lines are removed.
Will the original order change?
No, unique lines stay in the same order as the original input.
What does case-sensitive mean?
Case-sensitive matching treats Text and text as different lines.
Can I clean URL or keyword lists?
Yes, it works well for URLs, keywords, names, emails and other line-based lists.
Does it remove blank lines?
Blank lines are treated like normal lines, so repeated blank lines are reduced to one blank line.