CSV Normalizer — Fix Dates, Currency & Phone Numbers

Clean messy CSVs: auto-detect date, currency and phone columns and normalize them to one format. 100% local — data stays private.

Stop hand-fixing messy spreadsheets. CSV exports are never consistent. One row says 03/04/2026, the next says April 3, 2026. Amounts mix $1,200.50 with 1.200,50. Phone numbers come in five different shapes. CSV Normalizer cleans all of it in seconds — without sending your data anywhere. How it works 1. Load your data — drop in a CSV file or paste rows straight from a spreadsheet. 2. Automatic column detection — CSV Normalizer recognizes which columns are dates, amounts/currency, or phone numbers using built-in pattern rules (no AI, no guessing in the dark). 3. See before & after — every detected column shows a live preview so you can check the result before applying anything. 4. Pick your format, per column — dates as YYYY-MM-DD, DD-MM-YYYY, MM/DD/YYYY and more; currency with or without symbols and thousands separators; phone numbers with or without country codes. 5. Apply & download — get a clean, consistent CSV ready for import into your CRM, accounting tool, or database. 6. Nothing is silently broken — any value that doesn't match its column's pattern is flagged for you, never quietly mis-converted, with a summary at the end. Your data never leaves your browser. CSV Normalizer runs 100% locally. No uploads, no servers, no account, no tracking. Perfect for sensitive customer, financial, or contact data that should never touch a third-party website. Great for - Cleaning exports before importing into a CRM or ERP - Normalizing dates and currency across files from different sources - Standardizing phone number formats for contact lists - Anyone who keeps fixing the same formatting by hand Free to use. Built to stay fast and private.