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List Cleaner

Clean line-based lists locally by trimming lines, removing blanks, deduplicating, natural sorting, reporting duplicates, and comparing two lists with intersection, union, and difference operations.

1

Source list

Paste one item per line.

Characters

0 / 50,000

2

Operation

Choose a cleanup or compare mode.

Keep order · 4 options on

3

Result

Review stats, then copy or download TXT.

Source 0Output 0Duplicates removed 0Empty lines removed 0
List Cleaner

Quick Start

1
Paste one item per line.
2
Choose a cleanup or compare mode.
3
Review stats, then copy or download TXT.

Common Scenarios

Keyword lists

dedupe imported SEO or ad keyword rows before upload.

Import prep

trim whitespace and remove blank rows from IDs, emails, or tags.

Export comparison

find what changed between two CRM, CMS, or spreadsheet exports.

ID sorting

natural sort keeps item 2 before item 10.

Bulk formatting

add a bullet, quote mark, comma, or suffix to every output line.

Duplicate audit

return counts so repeated rows can be fixed at the source.

List Operations

Clean list applies trim, empty-line removal, optional dedupe, optional sort, then prefix/suffix.
Duplicate report groups repeated identities and outputs count plus first-seen line text.
Intersection keeps unique source lines that also appear in the compare list.
Union keeps unique source lines, then adds unique compare lines not already present.
Only in source returns source lines missing from the compare list.
Only in compare returns compare lines missing from the source list.

Usage Advice

Turn off case sensitivity when Alpha, alpha, and ALPHA should be treated as the same item.
Use natural sorting for numbered labels; keep order when row order carries meaning.
Apply prefix/suffix after choosing the operation so every generated output line is formatted consistently.
Set operations need the compare list; a blank compare list returns no intersection.
For very large lists, process chunks to keep browser memory and copy review manageable.

Limitations & Compatibility

Plain line model only: this is not a CSV parser, table editor, or fuzzy matching tool.
Case-insensitive matching changes identity only; the first-seen output casing is preserved.
Browser text limits apply; split huge exports before processing.
No spreadsheet formulas, column detection, file upload, cloud import, or account-shared list storage.
Invisible characters are preserved as real text; use a hidden-character cleaner when copied lines still look suspicious.

Privacy & Security

List cleanup runs locally in your browser. Source, compare, prefix, and suffix text may stay as browser drafts, and cleanup options may be kept in browser storage. If saved workspaces or WebDAV sync are enabled, those inputs and options may be saved through that sync. Result text, duplicate reports, stats, and TXT downloads are regenerated from the current inputs and options; this tool does not upload files or attachments.

FAQ

6

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All tool processing happens locally in your browser.