Paste any list or text to instantly remove all repeated lines. Sort, trim whitespace, and filter blank lines. Results update with one click.
This tool takes any block of text containing multiple lines, identifies lines that appear more than once, and removes the extra copies — leaving only one instance of each unique line. The original order of first appearances is preserved by default, so your list comes out in the same sequence you put it in, just without repeats. It is the fastest way to deduplicate email lists, URL lists, keyword lists, product SKUs, database exports, or any other line-by-line data without needing a spreadsheet or code editor. After processing, you can check the total line count using our Character Counter’s line counter, or analyse word patterns with the Word Frequency Counter.
With case-insensitive comparison enabled, the tool treats “Apple”, “apple” and “APPLE” as the same line and removes the duplicates. In the output, the version that is kept is determined by which occurrence is kept (first or last, controlled by the “Keep last occurrence” option). By default, comparison is case-sensitive: “Apple” and “apple” would be treated as two different lines and both kept. Enable case-insensitive comparison when cleaning lists where capitalisation inconsistencies are not meaningful — for example, a keyword list where “SEO tools” and “seo tools” are the same thing. Use our Case Converter to normalise the capitalisation of your list first if needed.
Normally, when a duplicate line is found, the tool keeps the first time it appeared and removes all later copies. Enabling “Keep last occurrence” reverses this: it keeps the final appearance and removes all earlier ones. This is useful when your data is ordered chronologically and the most recent value of a repeated entry is the one you want to keep — for example, a log of URLs visited where you want the last visit rather than the first.
Yes. The Sort output dropdown offers five options: original order (default), alphabetical A–Z, alphabetical Z–A, shortest line first, and longest line first. Alphabetical sorting is particularly useful when deduplicating keyword lists or domain lists that you want in a predictable order for scanning. Length sorting is useful for data validation tasks where you want to spot unusually short or long entries. Sorting happens after deduplication, so the count of unique lines is the same regardless of sort order.
Yes. With the “Trim leading/trailing spaces” option enabled (the default), a line with trailing spaces is treated as identical to the same line without them. This is almost always what you want when pasting data from spreadsheets, word processors, or copy-pasted web content, where invisible trailing spaces are common and meaningless. Disable trimming only if you are working with data where leading or trailing spaces are intentional and significant.
There is no artificial limit. Processing happens entirely in your browser using JavaScript, so the practical limit is your device’s memory. Lists of hundreds of thousands of lines process in well under a second on any modern computer. For extremely large files (millions of lines), a command-line tool like sort -u on Linux/macOS or a spreadsheet application would be more appropriate, but for virtually all everyday deduplication tasks this tool is more than fast enough.
Yes. One of the most common uses is cleaning keyword research exports where the same term has been pulled in from multiple sources and appears multiple times. Paste your keyword list, enable case-insensitive comparison (since capitalisation rarely matters for keywords), enable blank line removal, and click remove. The output is a clean, unique keyword list ready to import into your SEO tool or spreadsheet. For a deeper view of which terms dominate a piece of content, use the Word Frequency Counter after cleaning your list.
Excel’s “Remove Duplicates” feature works on spreadsheet columns and requires you to have your data in a properly structured sheet. This tool works directly on raw line-by-line text, which is faster for data that is already in a plain text format — email lists, log files, URL lists exported from tools, or any text you have copied from a website or document. No file upload, no formatting required: paste and process. You can also use the Text Repeater to quickly generate test lists to verify the tool’s behaviour before processing your real data.