How Excel Destroys Numeric Data (And How We Fix It)
By default, Microsoft Excel assumes numbers are mathematical values rather than formatted text. Here is how CleanMyCSV recovers your data:
1. Truncated US & European Postal Codes
East Coast US ZIP codes starting with zero (e.g. Massachusetts 02110, New Jersey 07001) and French postal codes (e.g. Nice 06000) lose their initial zero in Excel, becoming 4-digit strings like 2110 or 6000. Our engine identifies postal columns and pads them back to standard 5-digit or ZIP+4 (12345-6789) formats.
2. Stripped Phone Numbers & Country Codes
When sales leads contain local phone numbers like 0612345678 or 020 7946 0912, Excel removes the initial zero (turning it into 612345678). CleanMyCSV restores the leading zero or normalizes the phone number into international E.164 format (e.g. +33 6 12 34 56 78 or +1 (555) 019-2834).
3. Corrupted Product SKUs & Barcodes
E-commerce inventory and ERP exports frequently rely on zero-padded SKUs (e.g., 0004921). Excel turns these into 4921, breaking product matching during imports on Shopify, Amazon, or WooCommerce. Our Anti-ID safeguard isolates technical identifiers and protects their original text integrity.
4. Seamless Import to HubSpot, Salesforce & Klaviyo
Stop writing complex Excel formulas like =TEXT(A2, "00000") every time you prepare a lead list. Upload your raw CSV, let CleanMyCSV pad all missing zeros, and download a ready-to-import CSV in under 5 seconds.