Can I control the corruption level?
Yes. Pick the problems and how severe they get.
Data tool
CSV Corruptor
Break clean CSV files on purpose to test parsers, imports, validation rules, and messy-data cleanup workflows.
Runs Locally
This tool runs in your browser. Files never leave your device.
Drop a CSV/TSV/TXT file here or paste data below.
Drag and drop a CSV, TSV, or TXT file anywhere inside this input card.
Corrupted output
5 source rows · 7 columns · 289 B output · Comma delimiter
Source preview
Showing up to 60 parsed rows before corruption.
| 1 | id | name | plan | active | credits | created_at | |
| 2 | 1001 | Laramie | laramie@example.com | Pro | true | 120 | 2026-06-01 |
| 3 | 1002 | Jane Doe | jane@example.com | Free | false | 18 | 2026-06-03 |
| 4 | 1003 | Sam Smith | sam@example.com | Team | true | 240 | 2026-06-04 |
| 5 | 1004 | Avery Stone | avery@example.com | Pro | true | 90 | 2026-06-08 |
Corruption report
Rows dropped0
Rows duplicated0
Columns dropped0
Cells blanked2
Cells mutated6
Broken quotes2
Delimiter swaps0
Headers changed0
Junk inserted2
Change the seed to generate a different damaged file, or keep the same seed for repeatable parser tests.
What this tool does
CSV Corruptor introduces realistic problems into CSV files, like missing values, duplicate rows, ragged columns, and inconsistent formatting, so you can test import and validation before real data exposes the bugs. It is made for checking how parsers and ETL pipelines cope with imperfect spreadsheets.
How it works
Paste CSV data or open a file, choose the kinds of problems to introduce, and the tool generates a messed-up version in your browser. Copy or download it for testing. Nothing is uploaded.
When to use CSV Corruptor
Testing a CSV import against bad data
Validating an ETL or cleaning pipeline
Building negative test cases for a parser
Generating dirty data for ML preprocessing checks
FAQ
Why corrupt CSV on purpose?
Real exports are messy. Testing with broken data catches failures before production.
Are my files uploaded anywhere?
No. Everything runs in your browser and the data never leaves your device.