Values that Excel usually breaks
- Account and routing numbers with leading zeros, or longer than 15 digits.
- ZIP codes in the Northeast, like 02134.
- Codes that look like dates, such as part numbers 3-12 or SEPT1.
All of these stay text in the converted workbook. Amounts with $ signs, commas or parentheses become numbers you can total.
Opening a CSV in Excel without losing data
Double-clicking a CSV lets Excel guess every column. If you'd rather stay in Excel, import the file instead of opening it: Data > From Text/CSV, pick the file, then choose Transform Data and set the account number, ZIP and code columns to Text before loading. It works, but you have to repeat it for every file and every column, which is why a converter that already knows which values are safe to turn into numbers is faster for bank and client exports.
Bookkeeping files this helps with
- Bank and card exports before you clean them up for reconciliation: amounts become numbers you can sum, check numbers keep their zeros.
- Customer and vendor lists exported from QuickBooks, Xero or a CRM, where ZIP codes and tax IDs must stay exactly as typed.
- Payroll and payment processor reports with long transaction IDs that Excel would otherwise show as 1.23E+15.
If something still looks wrong
Check the preview before downloading: numbers are aligned right and text left, so a column that should total but sits on the left contains something unexpected (a stray letter, two decimal separators). Fix it in the source file or in Excel after download. If the whole file appears in one column, the separator wasn't a comma: the tool detects semicolons and tabs, so re-export the file from its source if it uses something unusual.