Duplicate Line Finder
Find, highlight, or remove duplicate lines from text. Choose case sensitivity, whitespace trimming, and whether to keep the first or last occurrence.
Frequently Asked Questions
How do I remove duplicate lines from text?
Paste your text and the tool finds repeated lines, letting you remove them to keep only unique lines or highlight the duplicates. The cleaned result is ready to copy.
Can I keep the first occurrence and remove the rest?
Yes. Removing duplicates keeps the first time each line appears and drops the later repeats, preserving your original order.
Is the comparison case-sensitive?
You can choose. Case-insensitive mode treats "Apple" and "apple" as the same line, while case-sensitive mode counts them as different.
What is this useful for?
It is great for deduplicating email lists, keywords, log lines, CSV rows and any list where repeated entries need to be cleaned out — all privately in your browser.