Quicksbooks allows users to both import and export MS Excel files, typically lists and transaction types, so in this sense xlsx to iif conversion is doable. It is unlikely the same can be done with any other software and no converter for this exists.
Home > Search converters: xlsx to iif
Conversion of xlsx file format to iif file format beta
Search for xlsx to iif converter or software able to handle these file types.
Convert Microsoft Excel Open XML workbook and spreadsheet to QuickBooks interchange format.
We have found one software suitable in our database for this conversion.
Microsoft Windows software 
- convert xlsx to iif on Windows
QuickBooks
A business accounting software from Intuit
File extension | Convert | Open | Save | Edit | Create | Import | Export | Extract |
|---|---|---|---|---|---|---|---|---|
Convert from xlsx file | No | No | No | No | No | Yes | No | No |
to iif file | No | Yes | Yes | iif editor | Yes | Yes | Yes | No |
The table with program actions contains information about what each program is capable of doing with their files. This may be a good pointer for further searches for certain file conversions and help you find the converter you are looking for if our search result is insufficient for you. However, it is far from perfect and may sometimes show results which are not really usable because of the nature of the software handles the files. So a conversion that appears as possible, just because of matched actions, may in fact not be possible.
Additional links: Open xlsx file, Open iif file
XLSX
Files with xlsx extension are s used by Microsoft Excel for its workbooks (spreadsheets) in Office Open XML format. XLSX is the latest spreadsheet format used by Excel with the adoption of XML formatting first used in Office 2007. While older xls files were in proprietary binary file format, xlsx spreadsheets use a somewhat altered XML scheme.
IIF
Files with iif extension can be mainly found as financial data files in QuickBooks interchange format.
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