Duplicate Line Remover
A fast, private duplicate line remover that instantly finds and deletes repeated lines, URLs, and keywords from your text — keeping the first occurrence and preserving line order.
Options
Paste your text, then click Remove Duplicate Lines
Your text stays in your browser
How to Use the Duplicate Line Remover
Paste your text
Type or paste any text into the editor — a keyword list, URL export, email list, or any multi-line content. Use the Paste button or press Ctrl+V / Cmd+V.
Set your options
Choose whether to match case-insensitively, trim spaces before comparing, or remove blank lines at the same time. The defaults work for most lists.
Remove and copy
Click Remove Duplicate Lines. The stats show how many duplicates were found and removed. Copy your cleaned result with one click.
Line Removal Options Explained
Case-Sensitive vs. Case-Insensitive Matching
By default, the tool uses case-sensitive matching: Email@example.com and email@example.com are treated as different lines and both are kept.
Turn on "Ignore case when comparing lines" and the same two lines are treated as duplicates — only the first occurrence is kept.
Input:
Email@example.com
email@example.com
EMAIL@EXAMPLE.COM
Case-sensitive (default):
Email@example.com ← kept
email@example.com ← kept (different case)
EMAIL@EXAMPLE.COM ← kept (different case)
Case-insensitive:
Email@example.com ← kept (first occurrence)
← removed
← removedTrimming Lines Before Comparison
Lines exported from spreadsheets or pasted from documents often carry invisible trailing spaces. By default, apple and apple are treated as different lines.
Turn on "Trim spaces before comparing" to strip leading and trailing spaces before comparison. Both lines are then treated as identical, and the output line is trimmed. Use the Remove Blank Lines tool first if you only want to strip empty gaps.
Input (trailing spaces shown as ·):
apple
apple·
apple
Trim OFF (default):
apple ← kept
apple· ← kept (different)
apple ← kept (different)
Trim ON:
apple ← kept and trimmed
← removed
← removedCommon Uses for Removing Duplicate Text
Cleaning Keyword and URL Lists
SEO keyword exports and crawl reports frequently repeat the same URL or keyword phrase across multiple rows. Paste the list, remove duplicates, and import a clean unique set into your tool or spreadsheet. Works equally well for keyword lists copied from character counter tools or research platforms.
Formatting Email and Contact Lists
Contact databases merged from multiple sources often contain duplicate email addresses. Use case-insensitive matching to catch variants like User@Email.com and user@email.com — both map to the same mailbox and count as one entry.
Deduplicating Spreadsheet Columns
Copy a single column from a spreadsheet, paste it here, and remove duplicates. The result is a unique value list you can paste back in. For columns with leading or trailing spaces from cell formatting, turn on trim comparison to catch hidden duplicates. Then use the Text Cleaner for further formatting.
Why Use a Private, Browser-Based Tool?
Fully private
Your text never leaves your device. Email addresses, keywords, and URLs are not uploaded, stored, or seen by any server. Processing happens entirely in your browser.
Instant results
Duplicates are removed the moment you click the button — no waiting for a server round trip. Works the same on slow connections or offline.
First occurrence kept
The tool always keeps the first time a line appears and removes later copies. The original order and content of unique lines is preserved exactly.