THE FEUTEX TOOLKIT

Spreadsheets Tools

Explore spreadsheets tasks including XLSX Workbook Inspector and Exporter, CSV to XLSX Workbook, JSON to Excel XLSX Converter.

How to choose a tool in this topic

Choose the right tool

Decide whether you need tabular text, a real workbook, stored formulas or cell-level comparison.

Workbook inspection does not calculate formulas; cached results may be stale.
CSV has no worksheet styling or formula engine; XLSX and VCF exports have different output contracts.
Open the individual workspace for its input format, limitations and download options.

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9 tools

CSV Delimiter Fixer with local processing, explicit controls and downloadable results.

CSV Encoding to UTF-8 Converter with local processing, explicit controls and downloadable results.

Create a real Excel workbook from CSV, preserving identifiers and storing values safely as text.

Compare Excel Worksheets with local processing, explicit controls and downloadable results.

Excel Contacts to VCF Converter with local processing, explicit controls and downloadable results.

Excel Duplicate Row Detector with local processing, explicit controls and downloadable results.

Excel Formula Extractor with local processing, explicit controls and downloadable results.

Turn an array of JSON objects into a real XLSX workbook with header columns, preserved primitive types and nested values stored as JSON

Inspect worksheets or export a selected Excel worksheet to CSV or JSON using real XLSX parsing.