CSV Sanitizer

Clean CSV Files Online: Fix Delimiters, Encoding & Malformed Rows

Essential for Shopify merchants, HubSpot users, and analysts importing CSV exports into databases (PostgreSQL, BigQuery, Snowflake) or visualization dashboards.

Dedicated Clean CSV Files Online Engine

🔒 100% In-Browser Memory • Zero Server Upload

Drop your CSV or TSV file to repair delimiters, quotes & leading zeroes

Fixes semicolon vs comma collisions, escapes internal quotation marks, and protects postal code leading zeroes.

Try Demo: Clean CSV Files Online →

Supported formats & specifications:

.XLSX .CSV .XLS .TSV Max 50MB Up to 100,000 Rows Client-Side Sandbox

Key Capabilities & Built-In Algorithms

Automated rules calibrated for this specific spreadsheet operation:

Auto-Delimiter Sniffing: Identifies comma, semicolon, tab, and pipe separators without configuration

Leading Zero Protection: Prevents Excel from converting postal codes (07030 -> 7030) or SKU identifiers

RFC 4180 Quotation Escaping: Fixes unescaped quotes inside cell text (e.g. 6" heavy cable)

UTF-8 BOM Stripper: Removes invisible Byte Order Marks that cause SQL syntax errors upon ingestion

Why CSV Imports Fail in Databases and Excel

CSV is not a single standardized format. European systems output semicolon-separated CSVs with decimal commas, while US tools expect comma separation. When Excel opens a European CSV, it crams the entire line into Column A. Furthermore, unescaped quotation marks inside product descriptions split single rows across multiple lines. SheetFix AI parses CSVs strictly according to RFC 4180 standards.

Realistic Before-and-After Demonstration

Notice how raw defect rows are specifically transformed by the Clean CSV Files Online engine:

Live Engine Verification

Raw Input Data (With Clean CSV Files Online Defects) Raw Defects

Postal Code	Branch City	Product Description	Unit Price ($)	CSV Parsing Result
07030	New York	Widget, Super 10"	14,50	Semicolon delimited; quotes unescaped; European decimal
02108	Boston	Gadget "Pro Edition"	420,50	Leading zero at risk (Excel strips to 2108)
94102	San Francisco	Heavy-Duty 6' Cable	12,00	Contains unescaped quotation mark character
08817	Edison	Standard Sensor Kit	85,00	Prefixed with invisible UTF-8 BOM byte signature

Sanitized Output (Standardized by SheetFix AI) Cleaned Output

Postal Code	Branch City	Product Description	Unit Price ($)	CSV Parsing Result
07030	New York	"Widget, Super 10"""	14.50	Leading 0 locked as text, quotes escaped, decimal fixed
02108	Boston	"Gadget ""Pro Edition"""	420.50	Leading 0 preserved, quotes standardized, decimal point set
94102	San Francisco	"Heavy-Duty 6' Cable"	12.00	Sanitized into RFC 4180 compliant field
08817	Edison	Standard Sensor Kit	85.00	BOM stripped; clean UTF-8 string

Transformation Summary: All four CSV defects repaired: Semicolons normalized to standard commas, leading zeroes in "07030" and "02108" locked, internal quotes properly doubled (""), and European decimal commas converted to periods.