100% free · Works right in your browser · No signup needed
The Remove Duplicate Lines tool cleans any line-based list - removing duplicates, empty lines, and optionally sorting everything A-Z. Paste a messy list, get a clean unique list back, with a full report showing exactly how many duplicates and blank lines were removed.
How to use: 1) Paste your list into the input box, one item per line. 2) Choose your options: case-sensitive matching (treat "Apple" and "apple" as different), sort A-Z, and remove empty lines. 3) Click Remove Duplicates. 4) Review the statistics, then copy the clean result with one click.
Why dedupe lists? Duplicate entries corrupt analysis everywhere. Email lists with repeats cause embarrassing double-sends, keyword research lists with duplicates waste hours of work, merged spreadsheets always contain overlap, and URL lists with repeats skew crawl audits. Manually scanning hundreds or thousands of lines for repeats is impractical and unreliable - human eyes glaze over after the first fifty lines. This tool processes thousands of lines in a fraction of a second with perfect accuracy.
Key benefits: Clear statistics show exactly how many duplicate lines and empty lines were removed, so you always know what changed - no black box. Case-sensitive mode gives you precise control when capitalization matters; leave it off for a smarter match. The optional A-Z sort turns the result into a tidy alphabetical list ready for reports. Like all FistHost tools it runs entirely in your browser - your lists are never uploaded to any server, so customer data and private lists stay private.
Pro tips: Run the tool twice with different settings for tricky lists - first dedupe case-insensitively, then sort A-Z to spot near-duplicates like "New York" versus "New York " with a trailing space. For email or URL lists, lowercase everything first with the Case Converter, then dedupe, for the cleanest result. If your list uses semicolons or commas instead of line breaks, replace them with newlines first (any text editor's find-and-replace does this in seconds) and then paste it here.
FAQs: Does it keep the original order? Yes - unless you enable sorting, the first occurrence of each line is kept and later repeats are dropped. What counts as a duplicate? Lines that are identical; with case-sensitive mode off, "Apple" and "apple" count as the same line. Is there a line limit? No artificial limit - only your browser's memory matters, and tens of thousands of lines are fine. Can I remove only empty lines? Yes - if there are no duplicates, it still cleans blank lines and reports them.
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