What is Line Deduplicator & Sorter?
Line Deduplicator and Sorter processes lists, logs, keywords, and other line-based text. You choose case sensitivity, blank-line handling, and sorting, while the first original occurrence is retained. Whitespace is not silently trimmed, so comparison rules are explicit and results remain easy to audit. Common workflows include the following. Clean duplicate IDs, addresses, or keywords copied from another system. Remove repeated log lines while preserving first-seen order. Sort deduplicated text using locale-aware comparison. The page also documents input boundaries, output behavior, and practical cautions so you can review the result before putting it into an application, configuration, test, or production workflow.
When to use it
- Clean duplicate IDs, addresses, or keywords copied from another system.
- Remove repeated log lines while preserving first-seen order.
- Sort deduplicated text using locale-aware comparison.
How to use it
- Paste one item per line.
- Choose case, empty-line, and ordering rules.
- Remove duplicates, sort if requested, and copy the output.
- Load one of the realistic examples first to verify the selected options and processing direction before replacing it with your own data.
- Review the output, status message, and documented limits; copy, download, or continue only after the result matches your expectation.
Runnable examples
The “Example 1” and “Example 2” buttons load the matching inputs. They cover different structures, directions, or boundaries and can be run directly in the workspace.
Example 1
JSON Formatter
Base64 Encoder
json formatter
Regex Tester
Base64 Encoder
UUID GeneratorExample 2
develop
main
Develop
preview
main
production
Preview
Input rules
- Each line is treated as one independent item.
- Leading and trailing whitespace remains part of the line.
- Case and blank-line comparison follow the selected options.
- Text input is counted before processing and is limited to 1,000,000 characters on this page; file modes apply the separate file limit shown in the workspace.
- Lines are not trimmed or normalized.
Output rules
- Duplicate items retain the first original spelling.
- Without sorting, first-seen order is preserved.
- Sorting uses Intl.Collator rather than raw byte order.
- Output reflects only the current input, direction, and options; rerun after changing a mode or value instead of treating an earlier result as current.
- Case-insensitive matching follows browser locale behavior.
Limitations and cautions
- Lines are not trimmed or normalized.
- Case-insensitive matching follows browser locale behavior.
- Sorting may differ slightly across browser Unicode data versions.
How your data is handled
Line splitting, comparison, deduplication, and sorting all run in the browser with no upload.