Convert XLSX to CSV: Excel to CSV Converter

XLSX (Microsoft Excel Open XML Spreadsheet) is the default format for Excel workbooks, capable of storing formatted data, formulas, charts, pivot tables, macros, and multiple worksheets in a single file. While powerful for business analysis, XLSX files require specialized software to open and are incompatible with most data pipelines, databases, and programming tools. Converting XLSX to CSV extracts the raw data values as plain comma-separated text — a universal format readable by virtually every data tool in existence.

Our XLSX to CSV converter uses a full spreadsheet engine to parse the Excel file and export each worksheet as a properly formatted CSV file. Formula cells are evaluated and replaced with their computed values. Date, number, and currency formatting is normalized to standard representations. The output CSV uses UTF-8 encoding with proper quoting and escaping, ensuring clean import into databases, Python scripts, R analysis, APIs, and any tool that consumes tabular data.

Data portability is the primary motivation. CSV files open in every programming language, database import tool, data analysis platform, and text editor. Python's pandas, R's read.csv, SQL LOAD DATA, and countless other tools consume CSV natively. XLSX requires specialized libraries (openpyxl, xlrd) that add complexity and dependencies. For data pipeline integration, CSV is the universal interchange format.

File size and simplicity matter for data processing. An XLSX file stores formatting, styles, formulas, charts, and XML metadata alongside the actual data — overhead that inflates file size and adds complexity. CSV strips away everything except the raw values, producing files 60-90% smaller than the original XLSX. This makes a meaningful difference when processing thousands of files or transferring data over limited bandwidth.

Database import workflows demand CSV. Importing data into PostgreSQL, MySQL, SQLite, BigQuery, Snowflake, and other databases is straightforward with CSV but complicated with XLSX. Most database import utilities expect CSV or TSV format. Converting XLSX to CSV before import eliminates parsing errors, encoding issues, and the need for Excel-specific import plugins.

LibreOffice evaluates all formulas in the XLSX file before export, replacing formula cells with their computed values. This means the CSV contains actual numbers and text, not Excel formula syntax. Cell references, VLOOKUP, SUMIF, and other formula types are fully resolved.

Multi-sheet workbooks produce one CSV file per worksheet when batch processing is enabled, or a single CSV from the active (first) sheet by default. Sheet names can be preserved in the output filenames. Empty rows and columns at the edges of data ranges are trimmed to produce clean CSV output without trailing delimiters.

Character encoding defaults to UTF-8 with BOM (Byte Order Mark) for compatibility with Excel's CSV import. Fields containing commas, quotes, or newlines are automatically quoted per RFC 4180. Date values are exported in ISO 8601 format (YYYY-MM-DD) by default, avoiding the ambiguity of locale-dependent date formats like MM/DD/YYYY vs DD/MM/YYYY.