Quick Answer
Removing duplicate lines keeps the first occurrence of each line and drops the repeats: paste a list and every duplicated line is removed, optionally ignoring letter case and surrounding spaces so “Apple” and “apple ” count as the same. The Remove Duplicate Lines tool at practicalwebtools.com/text/remove-duplicate-lines reports how many duplicates it removed, keeps original order or sorts alphabetically, and updates live counts. It runs entirely in this browser tab — check the Network tab.
How It Works
Paste the list with duplicated lines
Pick how lines compare: case-sensitive or not, trimmed or exact
Choose first-seen order or an alphabetical sort
Review the duplicate report and copy the deduplicated result
Key Facts
- Keeps the first occurrence of every line and drops the repeats
- Ignore or respect letter case: “Apple” and “apple” can match or stay separate
- Optional trim-before-compare treats “item” and “ item ” as the same line
- Output order: first-seen order preserved, or sort the result A to Z
- Per-line repeat report shows exactly which lines duplicated and how often
- Live counts for lines in, lines out, unique lines, and duplicates removed
- Handles Windows (CRLF), Unix (LF), and classic Mac (CR) line endings
- It runs entirely in this browser tab — check the Network tab: your list is never uploaded
Frequently Asked Questions
How do I remove duplicate lines?
Paste your list into the box and the deduplicated version appears instantly — the first occurrence of each line is kept and later repeats are dropped. Choose “Ignore case” if APPLE and apple should count as one line, and “Trim spaces first” if stray leading or trailing spaces should not split matches. Then copy the result.
How do I remove duplicates in Excel or Google Sheets instead?
In Excel, select the column and use Data → Remove Duplicates; in Google Sheets use Data → Data cleanup → Remove duplicates. Both require the data to already be one value per cell, and neither shows you which values repeated without extra formulas. This tool is the paste-and-go path for plain text lists, and the repeat report lists every duplicated line with its count.
Does the tool keep the original order of my lines?
Yes, by default. “Keep first-seen order” preserves the order in which each line first appeared, which is what you want for ordered data like rankings or transcripts. Switch to “Sort A to Z” if you want the deduplicated output alphabetized instead.
Are duplicate comparisons case-sensitive?
Your choice. “Case-sensitive” treats Apple and apple as different lines; “Ignore case” folds them together and keeps whichever appeared first, with its original casing. Comparison uses simple case folding, exactly like the lowercase transform you see in a text editor.
What counts as a duplicate line?
A line is a duplicate when its comparison key — the text itself, lowercased if case is ignored, and trimmed if trim-first is on — has already appeared. Everything else is preserved exactly: internal spaces, punctuation, and Unicode characters all pass through unchanged. Blank lines count as lines too, so a run of blank lines collapses to a single blank line.
Is my list uploaded to a server?
No. It runs entirely in this browser tab — check the Network tab: no request carries your text. That matters here because the lists people deduplicate are often customer emails, SKUs, or keyword exports.