What is a Line Sorter?
A line sorter takes a list — one item per line — and puts it in order, optionally cleaning it up along the way: removing duplicate entries, discarding empty lines, and trimming stray whitespace. It’s the fastest way to turn a messy list copied from a spreadsheet, log file, or email thread into a clean, ordered, duplicate-free version.
What Does This Tool Do?
Paste any list and the tool instantly applies your chosen combination of operations:
- Sort A → Z / Z → A — alphabetical order using natural sorting, so
item2comes beforeitem10(plain character sorting would putitem10first). - Keep order — skip sorting and only apply the cleanup options.
- Remove duplicates — keeps the first occurrence of each line and drops the rest, reporting how many were removed.
- Case-insensitive — treats
Appleandappleas the same line for sorting and deduplication. - Remove empty lines — drops blank and whitespace-only lines.
- Trim whitespace — strips leading and trailing spaces from each line before comparing.
The line counts above each panel show exactly what happened: how many lines came in, how many came out, and how many duplicates were dropped.
How to Use This Tool
- Paste your list into the input panel (one item per line).
- Choose a sort direction, or Keep order for cleanup only.
- Toggle the cleanup options you need.
- Copy the result from the output panel.
Common Use Cases
- Deduplicating email or ID lists: paste a mailing list and instantly remove repeated addresses (turn on Case-insensitive — email addresses aren’t case-sensitive).
- Cleaning spreadsheet columns: copy a column, clean and sort it here, paste it back.
- Organizing code: sort import statements, dependency lists, or configuration entries alphabetically.
- Comparing datasets: sort two lists the same way, then feed them to our Text Diff tool — sorted input turns reordering noise into a clean added/removed comparison.
- Tidying notes: alphabetize a bibliography, glossary, or task list.
Why Natural Sorting Matters
Plain character-by-character sorting treats 10 as smaller than 2 because the character 1 sorts before 2 — producing the infamous file1, file10, file11, file2 order. Natural sorting recognizes digit runs as numbers and compares them numerically, giving file1, file2, file10, file11. This tool always sorts naturally, which is almost always what a human wants; it’s the same ordering modern file managers use.
Frequently Asked Questions
Is my list private?
Yes. All processing happens locally in your browser — your data never leaves your device.
Which duplicate is kept — the first or the last?
The first occurrence survives, and later repeats are removed. If sorting is enabled, deduplication happens first (in original order), then the survivors are sorted.
Why do lines that look identical not get deduplicated?
Invisible differences — trailing spaces, tabs, or non-breaking spaces pasted from a web page — make lines technically different. Turn on Trim whitespace to neutralize edges; if duplicates still survive, the difference is inside the line (often a double space or a non-breaking space).
Does sorting handle accented characters correctly?
Yes — sorting uses locale-aware comparison, so é sorts next to e rather than after z (which is what naive byte sorting does).
Can I sort numerically instead of alphabetically?
For lists of plain numbers, natural sorting already orders them numerically (2 before 10). Mixed-content lines sort alphabetically with numeric runs compared as numbers.
Is there a size limit?
No hard limit — lists with tens of thousands of lines process instantly. Extremely large files (millions of lines) depend on your device’s memory.