A worked example
“Apple / apple / Pear” becomes “Apple / Pear” with case-insensitive deduplication enabled.
Line cleaner
Remove repeated or blank lines, trim line edges and optionally sort the result.
YOUR LITTLE WORKBENCH
ON YOUR DEVICE ✦Line cleaner
Text stays in page memory. Nothing is uploaded or saved automatically. Download a copy before changing tool pages.
Input lines5
Output lines3
Removed2
Cleaned copy
Apple apple Pear
Plain text only · 100,000 characters per input. Line diff: 1,200 lines; character diff: 1,500 Unicode code points. No semantic or fuzzy comparison.
THE METHOD / 01
A clear wayfrom start to finish.
The first occurrence is retained when deduplicating. Case-insensitive matching preserves the original surviving line.
Keep the assumptions clear
Up to 10,000 lines / 100,000 characters. Sorting is deterministic Unicode order, not natural-language collation.
A FEW USEFUL ANSWERS
Good to know.
Are my inputs uploaded?
No. Processing runs locally in your browser. The host still receives normal requests for website pages and assets.
Can I keep my result?
Use the download controls for the current tool or print from your browser. Seating plans, flashcards and document drafts autosave in this browser; see the privacy page.
Do I need an account?
No sign-up, paid API or subscription is required. Both languages use the same tools. English always opens at the root address.
DIFFKIND / TOOLKIT
A little help for every step.
01
Text comparison
Compare text by line or Unicode character, with additions and removals clearly marked.
Open tool03
List comparison
Find shared items, items only in either list, and the combined unique list.
Open tool04
Invisible characters
Show spaces, tabs and line endings; remove a defined set of zero-width characters.
Open tool