Remove Duplicate Lines
Paste a list and keep only the first copy of each line.
Removing Excel duplicate rows needs column rules
This page compares pasted lines and keeps the first copy. It does not open an XLSX file or decide which spreadsheet columns identify one record. Read how to remove duplicates in Excel for conditional formatting, Data > Remove Duplicates, column selection, backups, and row-count checks.
For a flat CSV where entire rows must match exactly, use CSV Cleaner. Keep a source copy before replacing spreadsheet or database data.
How to Use Remove Duplicate Lines
Remove Duplicate Lines cleans real lists of URLs, emails, keywords, IDs, or notes where one item belongs on each line.
- Paste the actual line-based list so spacing, casing, and tracking parameters are handled as they appear.
- Choose trim and case options based on whether near-duplicates should count as the same item.
- Remove duplicates, compare the line count, and scan the first results before replacing your source list.
- Tracking parameters, extra spaces, or different casing can make duplicate URLs look unique.
- Keep the cleaned list with the source name or date so it is clear which export was deduplicated.
Things to Check
- Tracking parameters can make duplicate urls look unique.
- Very long line lists can use extra browser memory; clean large exports in smaller chunks on mobile.
- Paste the cleaned list into the spreadsheet, email tool, script, or import field that needs unique rows.
Helpful FAQ
When is this tool most useful?
Use it for keyword lists, URL exports, email lists, ID batches, and any one-item-per-line cleanup task.
What should I inspect before using the output?
Check line count, casing rules, trimmed spaces, tracking parameters, blank lines, and whether order still matters.
Does this replace a specialist editor?
For database deduplication, fuzzy matching, or compliance-sensitive contact lists, use data-quality tools.
Related cleanup tools
For broader text cleanup, use the Find and Replace Text Tool to replace repeated phrases, remove line breaks, and clean copied document text before or after deduplicating lines.
Maintained by Taimour Husnain.
How to remove duplicate lines in Excel
To remove duplicates in Excel, select your data range, go to Data > Remove Duplicates, choose the columns to check, and click OK. Excel keeps the first occurrence and deletes subsequent duplicates. For text-based deduplication, paste your data into the tool above instead — it works on any text, not just spreadsheet rows.
The online tool supports case-sensitive and case-insensitive matching, preserves original line order, and handles CSV, plain text, and tab-separated data. For large files, process in chunks of 10,000 lines for best browser performance.