CSV guide · Repair
Fix CSV for free before importing
A good CSV repair should not guess. It should only change what can be justified and leave risky cases for review.
Why it happens
Most failed imports come from mechanical problems such as separators, repeated headers, empty rows, and cells that begin like spreadsheet formulas.
How Piojo Lab detects it
The report shows the rule, severity, location, explanation, and a short safe sample so the change is auditable.
What to do before importing
A corrected file is available when every repair is traceable. Ambiguous numbers, dates, or broken rows are flagged instead of silently changed.
When not to automate
Always keep the original file and review a sample before importing the corrected copy.
Quick questions
Is it really free?
You can use the diagnosis and safe corrected downloads with a generous local daily limit.
What happens after the limit?
The current flow offers an optional rewarded message for one extra corrected download.
Test the file before touching your system
Drop a CSV or TSV into the analyzer. The diagnosis runs in your browser, samples are truncated, and the report does not include the filename.
Open local analyzer