Free CSV & Data Tools
12 browser-based utilities for converting, cleaning, auditing, and wrangling data. Your files never leave your device. No signup. No limits.
Pre-Send PII Audit
Check any file for emails, SSNs, API keys, and personal data before you send it.
Two-File Reconciler
Drop two spreadsheets, see exactly what changed — added, removed, and modified rows.
Research Data De-Identifier
Mask, generalize, and pseudonymize a dataset. Check k-anonymity. Export a methods log.
Duplicate Row Remover
Find and remove duplicate rows from any CSV — instantly.
CSV to JSON Converter
Convert CSV files to JSON arrays — no coding needed.
JSON to CSV Converter
Flatten JSON into a clean CSV spreadsheet in one click.
CSV Column Picker
Select, drop, reorder, and rename CSV columns — then download.
CSV to Markdown Table
Turn any CSV into a GitHub-ready Markdown table.
CSV to SQL Generator
Generate SQL INSERT statements from a CSV — MySQL, PostgreSQL, SQLite.
CSV Merger
Stack or join multiple CSV files into one download.
Test Data Generator
Generate realistic fake CSV data for testing — up to 100k rows.
Excel Formula Explainer
Paste any Excel formula — get a plain-English explanation.
Related guides
- How to check a spreadsheet for PII before sending it
- How to compare two CSV files and spot every change
- How to de-identify research data: masking, generalization, and k-anonymity
- What is data uniqueness? (and how to find duplicates)
- What is data cleansing?
- What is data validation?
- What is data profiling?
- What is data normalization?
- What is an ETL pipeline?
100% private — your data stays in your browser
Every tool processes your files locally using Web APIs. Nothing is uploaded to any server. Close the tab and the data is gone. We built these tools to the same privacy standard as Sohovi — our data quality platform.