Sort and Deduplicate Lines
Sort lines alphabetically and remove duplicates in one step. Options for trim whitespace, remove blank lines, and case-insensitive deduplication.
Pure browser JavaScript — no libraries required.
How to use this tool
- Paste your lines.
- Choose sort order and deduplication options.
- Click Apply and copy or download the result.
Sort lines alphabetically and remove duplicates in one step. Options for trim whitespace, remove blank lines, and case-insensitive deduplication.
How it works
Sort and Deduplicate Lines takes a list of text lines, sorts them alphabetically, and removes duplicate entries in one operation. Paste your list, configure the options, and click Process to get a clean, sorted, unique list in seconds.
Options include trimming leading and trailing whitespace from each line (preventing near-duplicates caused by invisible spaces), removing blank lines, and case-insensitive deduplication (so 'Apple' and 'apple' are treated as the same entry, with the first occurrence kept).
This tool is useful for cleaning up email lists, tag lists, keyword sets, dependency lists, test case names, or any collection of items that may have accumulated duplicates over time. The sorted output is also easier to scan, diff, and maintain.
Worked example
Deduplicate a list of email addresses
- Paste the full list of email addresses, one per line.
- Enable 'Trim whitespace' and 'Case-insensitive deduplication'.
- Enable 'Remove blank lines'.
- Click 'Process' — duplicates are removed and the list is sorted.
- Click 'Copy' to get the clean list.
A sorted, unique list of email addresses with no duplicates, ready to import into your email tool.
Common mistakes to avoid
- Pasting data with inconsistent capitalization (e.g. 'New York' vs 'new york') without enabling case-insensitive deduplication — both entries will be kept as distinct lines.
- Not enabling 'Trim whitespace' when the source has trailing spaces — 'apple ' and 'apple' look identical but are treated as different strings without trimming.
- Expecting alphabetical sort to handle locale-specific characters (accented letters) in the correct language order — the sort uses Unicode code points, which may not match local language alphabetical conventions.
Key terms
- Deduplication
- The process of identifying and removing duplicate entries from a dataset, keeping only one copy of each unique value.
- Alphabetical sort
- Ordering items by their character values from A to Z, with numbers typically preceding letters depending on locale settings.
Frequently asked questions
- Does case-insensitive dedup keep the original casing?
- Yes — the first occurrence (with its original case) is kept; later duplicates are removed.