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.

CSV input

Drop a CSV/TSV/TXT file here or paste data below.

Open file

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

DelimiterDamage presetSeed

Drop rows8%Drop columns3%Blank cells10%Mutate values8%Break quotes6%Swap delimiters5%Add newlines3%Duplicate rows8%Damage headers7%Insert junk4%

id,name,email,plan,active,credits,created_at
1001,aramie,laramie@example.com,Pro,true,"120
extra line",2026-06-01
�002,Jane Doe,"jane@example.com,Free,false,18,2026-60-03
1003,,"sam@example.com,TNULLam,true�,240,2026-06-04�
1004,"Avery Stone
continued",avery@example.com,Pro,,90,2026-06-08

Source preview

Showing up to 60 parsed rows before corruption.

1	id	name	email	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

Related tools

View all tools

Dataset Corruptor

Add noise, missing values, and bad rows to a dataset.

CSV Viewer

Open and inspect CSV data in a table.

CSV to JSON

Convert CSV table data into JSON.

JSON Corruptor

Generate broken JSON to test error handling.

Random Character Inserter

Insert random characters into text.