Text Tools Guides & Tutorials
3 Text Tools guides and tutorials - practical usage, common errors and worked examples.
3 guides in this category
Still Duplicated After Deduping? Five Data Cleaning Traps
Duplicates that survive deduping are usually trailing spaces, fullwidth characters or invisible ones. How lines match, why A sorts first, and regex.
Chinese ID Card Number: Checksum, Region and Privacy Rules
What the 18 digits of a Chinese ID number encode, how the weighted mod-11 checksum works, how 15-digit numbers upgrade to 18, and how to handle them safely.
Clean a Long List: Deduplicate, Sort and Reverse Text Lines
A practical guide to cleaning lists of hundreds of lines: what dedup does with case and trailing spaces, why 10 sorts before 9, and which reverse mode to pick.
Tools in this category
Count words, characters, lines, paragraphs and bytes as you type. Free, no si…
Open tool →Text DeduplicateRemove duplicate lines, ignore case and blank lines
Open tool →Text SorterSort lines ascending/descending with natural number sort
Open tool →Text ReverserReverse characters, lines, inline and words
Open tool →Find & ReplaceFind and replace with plain text or regex modes
Open tool →ID Card LookupValidate the 18-digit check digit of a Chinese ID, then parse birth date, gen…
Open tool →