Text Deduplicator
Remove duplicate lines from text. Support line-by-line or whole-text deduplication with trim and case-insensitive options. Free online tool.
Frequently Asked Questions
How does the line-by-line deduplication work?
Each line of your text is treated as a separate item. The tool goes through each line and keeps only the first occurrence of each unique line. You can optionally trim whitespace and ignore case before comparing.
What is word-level deduplication?
Word-level mode splits your text into individual words (separated by spaces) and removes duplicate words while preserving the order of first occurrence. This is useful for cleaning up keyword lists, tags, or word lists.
Does the tool preserve the original order?
Yes, the tool preserves the order of first occurrence. The first time a line or word appears, it is kept. Subsequent duplicates are removed. The relative order of unique items stays the same as in your original input.
What does "Show duplicate count" do?
When enabled, the tool appends a count in parentheses after each line showing how many times it appeared in the original input. For example, "apple (3)" means "apple" appeared 3 times in the input.
Is my data safe?
Yes, all processing happens entirely in your browser. Your text is never uploaded to any server. This tool works offline once the page is loaded.
What's the maximum text size?
There's no hard limit โ it depends on your browser's memory. The tool can handle tens of thousands of lines without issues. For extremely large files (millions of lines), your browser may become slow but it should still work.