Remove Duplicate Lines

Paste your text into the input area, click Remove Duplicates, and copy the cleaned output. The tool keeps the first occurrence of each line and drops every later repeat. So a list with "apple, banana, apple, mango, banana" becomes "apple, banana, mango". Switch on "preserve order" if you want lines to stay in their original positions, or alphabetical sort if you want them ordered as they're deduped. Useful for cleaning email lists, URL collections, and import files.

Paste your list with one item per line and click Remove Duplicates. The tool returns a unique list — only the first occurrence of each item survives. Works the same way whether your list has 10 entries or 10,000. Toggle case-sensitivity if "Apple" and "apple" should be treated as different items, or leave it off so they collapse together. Copy the cleaned output back into your spreadsheet, database import, or wherever you needed unique values.

Paste the list with one email per line. The dedupe tool compares lines exactly, so "[email protected]" and "[email protected]" will be seen as different unless you turn on case-insensitive matching. Switch that on for emails since address case usually doesn't matter. Hit Remove Duplicates and copy the cleaned list. Combine this with sorting if you want the final output alphabetical for easier review or merging with another contact file later.

Open the text file, copy everything, paste it into the dedupe tool, and run Remove Duplicates. The tool compares lines top-to-bottom and removes any line that matches one earlier in the list. Save the cleaned output back to a new file. Works on log files, configuration files, URL lists, and SQL dumps. If your file has lines with trailing whitespace that's making "duplicates" not match, run a trim pass first using the whitespace remover.

That's the default behaviour. Paste your list, click Remove Duplicates, and the first time a line appears it stays — every later copy gets dropped. So "Mango, Apple, Mango, Banana, Apple" becomes "Mango, Apple, Banana" with the original order intact. If you want the last occurrence kept instead, there's usually a separate "keep last" toggle. Most use cases want the first one because that's the entry you found and added originally.

Switch on "remove blank lines" along with the dedupe option. The tool then strips empty lines as well as duplicate non-empty ones, leaving you with a clean, compact list. Useful when you've copied text from a PDF or web page and you've ended up with random gaps between lines. If you want only blank-line removal and no actual deduplication, use the whitespace tool instead — that keeps every non-blank line, repeats and all.

Convert your comma-separated list into one-per-line first. The find-and-replace tool can swap commas with newlines using regex, or you can use the dedupe tool's built-in delimiter option if available. Once each value is on its own line, run Remove Duplicates. Then convert back to commas if you need the original format — replace newlines with ", " using regex. Three steps, all on the same page, takes maybe thirty seconds.