Sort & Dedupe Lines

Sort & Dedupe Lines works like the sort and uniq commands in your browser. Paste a list or open a .txt or .csv file, then sort it alphabetically, naturally, numerically, by length, in reverse or in a reproducible shuffle, and remove duplicate lines by exact, case-insensitive or normalized comparison. Line statistics and a list of removed duplicates show exactly what changed.

1. 1.Paste one item per line, open a .txt or .csv file, or load an example.
2. 2.Choose a sort order and how duplicates are detected.
3. 3.Choose whether the first or last copy of a duplicate is kept, and whether lines are trimmed and blank lines removed.
4. 4.Check the line statistics and the Removed duplicates tab.
5. 5.Copy or download the result.

Every run follows the same order: line endings (CRLF, CR or LF) are normalized, each line is trimmed if enabled, blank lines are removed if enabled, duplicates are removed, and finally the remaining lines are sorted. Because trimming happens first, "apple" and "apple " count as duplicates when Trim each line is on.

A → Z and natural order use locale-aware comparison, so accented letters sort next to their base letter and natural order places file2 before file10. Numeric order reads the leading number of each line, including negatives, decimals and exponents; lines without a leading number go last in their input order. Every sort is stable: lines that compare equal keep their input order. Shuffle uses a seeded generator, so the same input gives the same order until you select Reshuffle.

Lines are processed in your browser and are not uploaded. Only your option choices are remembered on this device. Inputs up to 20,000,000 characters are supported; large inputs update after typing pauses, and the preview shows the first 20,000 lines while Copy and Download include every line. CSV files are treated as plain lines, so quoted fields that span several lines are not merged.