Open source data portability linter
Your CSV is valid.
Its values may not survive.
Catch silent meaning changes across JavaScript, spreadsheets, databases, and locales—before an import or handoff turns them into production data.
uv tool install git+https://github.com/pranshu26/losslesslint
Try it now
Browser playground
Illustrative scanner
Ready to inspect
Paste a CSV or use the risky demo.- Error
- 0
- Warning
- 0
- Groups
- 0
The Python CLI is canonical.
Install the CLI
This browser demo covers seven high-signal rules for exploration. Use the CLI for full parsing, all rules, stable output, redaction, and CI exit codes.