Remove duplicate lines from any block of text instantly
Removing duplicates from a list is one of the most common data-cleaning tasks. Whether you have a CSV column of emails, a pasted list of IDs, or output from multiple data sources merged together, duplicate entries cause double-counting, failed imports, and wasted processing time. This tool takes any text list — one item per line — and returns the unique values instantly.
Beyond simple deduplication, the tool offers options that matter in practice: case-insensitive matching (so "Apple" and "apple" are treated as the same), trimming leading/trailing whitespace before comparing, preserving the original order versus sorting alphabetically, and showing only the duplicates themselves if you want to audit what was removed. These options handle the majority of real-world list-cleaning scenarios without scripting.
Yes, by default it keeps the first occurrence of each item and removes subsequent duplicates, preserving the order of first appearances. An option to sort alphabetically is also available if you prefer a sorted output.
When enabled, comparison is done in lowercase, so "Apple", "APPLE" and "apple" are treated as duplicates. The output keeps the first version encountered (e.g. "Apple" if that appeared first).
This tool works on single-column text lists. For CSV deduplication by a specific column, paste just that column, deduplicate, then re-join. A full CSV tool with column-aware deduplication is better suited for multi-column files.
Blank lines are either removed automatically (if the "ignore blank lines" option is on) or treated as empty-string entries. In most cases you'll want to ignore blanks, which is the default behaviour.
Uppercase / Lowercase · Word Counter · Character Counter · Lorem Ipsum Generator · Remove Extra Spaces · Sort Text Lines