What it does
JoinLines groups line sorting, counting, stripping, file splitting, joining, prefixes, suffixes and list comparison.
JoinLines’ file splitter accepts pasted text or a dropped TXT, CSV or LOG file. Choose a split by parts, bytes, lines, code points, a literal delimiter or a regular expression, inspect the capped preview and download the TXT chunks as a ZIP. Delimiter and regex splits consume separators, and CSV headers are not automatically repeated in each chunk. The publisher recommends Download when large clipboard output may truncate. Its splitter guide describes about 10 MB or 50,000 lines as a comfortable workload; much larger jobs can stall the browser. The service is free without signup and describes processing as browser-side.
Strengths
- Set-style list comparison
- Text-file splitting and custom-separator joining
Best for
- Preparing line-based lists for another application
Sources
- JoinLines — eight small tools for lines of text (Oct 26, 2026)
- JoinLines: eight small tools for lines of text (Oct 26, 2026)
- Text File Splitter: Split Large Files Online, Free | JoinLines (Oct 26, 2026)