CSV Barcode & Leading Zero Protector
Create an Excel-safe CSV for selected barcode, SKU, phone, and postal-code columns without guessing lost digits.
Data handling
Storage and export controls
- Retention
- The tool's working state is kept only while this page is open. Inputs and results are not saved to persistent storage by Got A Tool.
- Export
- The tool may prepare a result after you run it. It downloads or copies it only when you choose that action.
Advertising and analytics are separate site services. We do not send selected tool input to them. Read the Privacy Policy for details.
How it works
Protect identifiers before opening a CSV in Excel
Spreadsheet software can change leading zeros, long identifiers, and formula-like values. Choose the columns that need protection before you download a new CSV.
Step 01
Choose a CSV
Open a supported CSV file from your device.
Step 02
Select identifier columns
Mark barcode, SKU, phone, or postal-code columns that should remain text.
Step 03
Review and download
Check any UPC-A or EAN-13 findings, then download the protected CSV.
What this tool does and its limits
- The tool protects selected columns. It does not reconstruct digits that a previous spreadsheet save has already lost.
- Formula protection is limited to values in the output CSV; review imported data in the spreadsheet application you use.
Practical guide
Read the Product identifier checklist
Protect identifier columns as text, review values that may have been changed by a spreadsheet, and validate before you generate labels.
Open the guide →Keep working
Related tools
CSV Repair & Dialect Normalizer
Review inconsistent CSV rows, normalize verified rows, and keep problem rows in a separate review file.
Open tool →CSV ↔ JSON Converter
Convert CSV to JSON or JSON objects to CSV locally with validation and spreadsheet-safe output.
Open tool →Bulk Barcode Generator
Create EAN-13, UPC-A or Code 128 barcodes from CSV with row-by-row validation.
Open tool →