Smart Spreadsheet Cleaner Pro – Offline Excel Cleaning & Validation Toolkit

Tired of messy Excel files breaking your reports?
Smart Spreadsheet Cleaner Pro is an offline Windows desktop app that cleans and standardizes your Excel spreadsheets in a few clicks – with a clear log of every change it makes.

No cloud, no subscriptions, no technical skills required. Just load your Excel file, analyze the columns, pick what you want to clean and export a fresh, standardized version.

What Smart Spreadsheet Cleaner Pro does for you

• Fixes ugly headers
  • Remove diacritics and special characters
  • Convert headers to lowercase or clean snake_case
  • Trim spaces and normalize inconsistent texts
• Standardizes text data
  • Remove leading/trailing spaces
  • Collapse multiple spaces into one
  • Optional removal of diacritics from data (for systems that can’t handle accents)
• Cleans and formats dates
  • Detects date-like columns and lets you set the correct interpretation (day-first or month-first)
  • Converts mixed user-entered date formats into a consistent format (e.g. DD.MM.YYYY or YYYY-MM-DD)
  • Keeps original values if a date cannot be parsed – no silent data loss
• Validates contact and business fields
  • Email – basic structure check (something@domain.tld), reports invalid entries
  • Phone numbers – normalizes formats (+421905123456, 0905-123-456, etc.) and highlights invalid ones
  • Postal codes – checks common patterns (e.g. 12345, 123 45)
  • IBAN – full international IBAN structure + checksum validation (not just one country)
  • VAT numbers – simple pattern check by country prefix + alphanumeric digits
• Normalizes numbers and decimals
  • Handles localized values like 1 234,50, 1.234,50, 1,234.50
  • Detects likely decimal and thousands separators per column
  • Converts text numbers into real numeric values and re-formats them consistently
  • Option to automatically coerce numeric-looking strings into numbers
• Removes noise from your data
  • Delete completely empty rows
  • Remove duplicates based on all columns or a selected subset
  • Keep your original file untouched and export a new _cleaned version
• Multi-sheet Excel support
  • Choose exactly which sheet to clean from a drop-down
  • Use the same configuration for multiple files with similar structure
• Transparent reporting and audit log
  • For every cleaned file, the app generates a human-readable log (_cleaned_log.txt)
  • Summary of operations (rows removed, duplicates, invalid emails/phones/IBANs, etc.)
  • Configuration snapshot used for cleaning
  • Sample lists of problematic values (limited per column) for quick review

Who is this for?

• Business analysts, controllers, data analysts
• Accountants and finance teams receiving Excel from clients
• Operations and support teams who get messy exports from legacy systems
• Anyone who spends time manually fixing Excel before they can actually work with it

If you regularly think “Why do I always have to clean this file first?”, this tool is built for you.

Why you’ll love Smart Spreadsheet Cleaner Pro

• ✅ 100% offline – no cloud, no uploads, no data leaving your machine
• ✅ One-time purchase – no subscription, no hidden fees
• ✅ Excel-first – designed for real-world Excel files, not just toy CSV samples
• ✅ Fast to use – typical workflow is: Select file → Analyze columns → Clean & Export
• ✅ Safe by design – original file is never modified, output is saved as a new _cleaned.xlsx
• ✅ Batch mode – apply the same cleaning configuration to a whole folder of Excel files
• ✅ Clear logs – perfect for internal compliance, auditing or simply “what exactly changed?” questions

Typical use cases

• Cleaning customer lists before importing into CRM or email marketing tools
• Standardizing banking / payment exports with IBAN, BIC, VAT and amounts
• Preparing multi-country reports where different teams use different formats
• Fixing survey results or registration forms collected from various sources
• Normalizing phone & email contact lists before sending them to call centers or agencies

How it works (simple 3-step workflow)

1. Select your Excel file and choose the sheet you want to clean.
2. Click “Analyze columns” to see how the app classifies each column (date, number, text, email, IBAN, etc.) and adjust roles if needed.
3. Click “Clean & Export” – the app creates a cleaned Excel file plus a detailed log next to it.

That’s it. No scripting, no formulas, no macros – just a focused, offline Excel cleaning assistant.