Why is UTF-8 encoding important for data migration?

Destination systems — databases, CRMs, ERPs — store text in UTF-8. If source CSV files use a different encoding (like Windows-1252, common in older Excel exports), characters outside the basic ASCII range will corrupt on import. UTF-8 source files eliminate this class of migration error.

Can I convert a large batch of legacy Excel files at once?

Yes. Deliteful supports uploading multiple files in a single session, with each producing a separate CSV output. For very large migration batches, process files in groups to stay within size limits.

How are calculated fields handled in the CSV output?

All formula cells are replaced by their computed values. This is the correct behavior for migration — destination systems should receive the actual data values, not Excel formula syntax that has no meaning outside of Excel.

What if the legacy Excel files have multiple worksheets?

Only the first worksheet is exported per file. If relevant data is on other sheets, restructure the workbooks to place the target data on the first sheet before uploading, or export each sheet as a separate file.

Is this suitable for converting files from older Excel formats like .xls?

Yes. Both .xls (Excel 97–2003) and .xlsx (Excel 2007+) are supported. Legacy .xls files are common in older data stores and convert with the same behavior as modern .xlsx files.

Excel to CSV Conversion for Data Migration and System Switching

Data migrations fail at the format boundary. When legacy data lives in Excel workbooks and the destination system expects CSV, format conversion becomes a critical preprocessing step — and a common source of import errors. Deliteful converts Excel files to UTF-8 CSV with consistent encoding and resolved formula values, removing format-related failure points from your migration pipeline.

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Data migration projects — moving from one CRM to another, switching ERP systems, consolidating records into a data warehouse — almost always encounter Excel files in the source data. Finance teams maintain records in Excel. Operations teams track inventory in Excel. Sales teams keep contact lists in Excel. Extracting this data for migration means converting it to a format the destination system accepts, which is nearly always CSV. The challenge is that manual Excel exports produce encoding variations that cause import rejections at the destination.

Deliteful standardizes this conversion step. Every output file is UTF-8 encoded, formula cells resolve to values, and column structure is preserved exactly as it appears in the source worksheet. For migration teams processing hundreds of legacy files, batch upload support means multiple workbooks convert in a single session, with each producing its own clean CSV output ready for validation and load.

How it works

1
Upload legacy Excel files
Upload the .xlsx or .xls files extracted from your source system or legacy file store.
2
First worksheet converts to UTF-8 CSV
Deliteful exports each workbook's first sheet with all formula values resolved and UTF-8 encoding applied.
3
Validate and load into destination system
Download the CSV files, run your migration validation checks, and load into the target system or database.

Frequently asked questions

Why is UTF-8 encoding important for data migration?: Destination systems — databases, CRMs, ERPs — store text in UTF-8. If source CSV files use a different encoding (like Windows-1252, common in older Excel exports), characters outside the basic ASCII range will corrupt on import. UTF-8 source files eliminate this class of migration error.
Can I convert a large batch of legacy Excel files at once?: Yes. Deliteful supports uploading multiple files in a single session, with each producing a separate CSV output. For very large migration batches, process files in groups to stay within size limits.
How are calculated fields handled in the CSV output?: All formula cells are replaced by their computed values. This is the correct behavior for migration — destination systems should receive the actual data values, not Excel formula syntax that has no meaning outside of Excel.
What if the legacy Excel files have multiple worksheets?: Only the first worksheet is exported per file. If relevant data is on other sheets, restructure the workbooks to place the target data on the first sheet before uploading, or export each sheet as a separate file.
Is this suitable for converting files from older Excel formats like .xls?: Yes. Both .xls (Excel 97–2003) and .xlsx (Excel 2007+) are supported. Legacy .xls files are common in older data stores and convert with the same behavior as modern .xlsx files.

Create your free Deliteful account with Google and convert your legacy Excel files to migration-ready UTF-8 CSV before your next system cutover.