A desktop-grade data converter for Windows
Data conversion lives at the boundary between humans and systems. Stakeholders work in Excel; databases want CSV; web apps want JSON. Cloud converters are awkward here — your customer list, financial export or audit log doesn’t belong on a third-party server.
File Converter Pro handles XLSX ↔ CSV ↔ JSON locally on Windows with full control over delimiters, encoding, type inference, and JSON shape. The queue happily processes a folder of monthly exports in one run.
Supported formats
- XLSX — Microsoft Excel workbooks (multiple sheets, formatting, formulas).
- XLS — legacy Excel binary format.
- CSV — comma-, semicolon- or tab-separated value files.
- JSON — array-of-objects, records, or nested structures.
Encoding options cover UTF-8 (with or without BOM), UTF-16, and ANSI for legacy importers. Delimiter detection is automatic on read; you control it explicitly on write.
Popular conversions
Why choose File Converter Pro for data conversion
- Stays offline. Customer data, financial exports and audit logs never leave your computer.
- Batch by default. Convert a folder of monthly exports in one run.
- Encoding control. UTF-8, UTF-8 BOM, UTF-16, ANSI — for legacy importers and modern systems alike.
- Type-aware JSON. Numbers, booleans and dates can be inferred or kept as strings — your pick.
- Sheet selection. Export the active sheet, named sheets, or every sheet to separate files.
- Formula handling. Keep formulas as values or preserve the formula string on round-trip.
Real-world workflows
Data engineers turn quarterly XLSX exports into UTF-8 CSV ready for warehouse ingestion. The encoding-with-BOM toggle handles older importers; without-BOM is the cloud default.
Frontend developers build mock APIs by converting CSV product catalogs into JSON fixtures — array-of-objects shape, typed values, ready to drop into a React app.
Analysts flatten JSON API dumps into XLSX so business stakeholders can filter, pivot and chart without touching a JSON viewer.
ML engineers preprocess training data by converting between formats with consistent encoding and delimiter handling — no surprise UTF-16 or Windows-1252 quirks downstream.
Most data-conversion bugs are about the small details: a CSV that opens fine in one editor and looks corrupted in another, a JSON file that imports as strings instead of numbers, a multi-sheet XLSX flattened into one CSV with no separator. File Converter Pro applies sensible defaults for each format pair while exposing every knob in the output panel — encoding (UTF-8, UTF-8 BOM, UTF-16, ANSI), delimiter (comma, semicolon, tab, pipe), quote style, line ending (CRLF / LF), date format (ISO 8601 by default, locale-specific on request), and decimal separator. The same controls apply to every file in a batch, so the output is consistent across hundreds of conversions.
FAQ
How does the converter handle nested JSON?
You choose: flatten dot-paths into columns (object.field becomes its own column), explode arrays into one row per item, or keep nested structures as JSON-string cells. The default is dot-path flattening for stakeholders, explode for analytics.
Can I export a multi-sheet XLSX as multiple CSV files?
Yes. Pick “every sheet to separate file” in the output panel and the app emits one CSV per sheet, named after the sheet.
Will my CSV encoding be preserved correctly?
Yes. The app reads any common encoding automatically (UTF-8, UTF-16, ANSI), and writes to the encoding you pick. Use UTF-8 for modern systems; UTF-8 BOM for older Excel; ANSI only for legacy importers that demand it.
Is data conversion offline?
Yes. Conversion runs locally on your Windows PC. Customer rosters, financial data, and audit JSON never go to a cloud service.
Start converting now
Install File Converter Pro from the Microsoft Store and run your data pipeline locally with full control over encoding, delimiter and JSON shape.