Convert XLSX to CSV — Excel to CSV Converter
Convert Excel XLSX spreadsheets to CSV. Extract data as plain comma-separated values for databases, APIs, and data processing. Free online tool....
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Upload your .xlsx file by dragging it into the upload area or clicking to browse.
Choose your output settings. The default settings work great for most files.
Click Convert and download your .csv file when it's ready.
About XLSX to CSV Conversion
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 LibreOffice's 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.
Why Convert XLSX to CSV?
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.
Common Use Cases
- Export Excel sales data to CSV for import into CRM systems like Salesforce or HubSpot
- Convert XLSX financial reports to CSV for processing in Python pandas or R data analysis scripts
- Prepare Excel contact lists as CSV for bulk import into email marketing platforms
- Extract XLSX survey results to CSV for loading into statistical analysis software
- Convert Excel inventory spreadsheets to CSV for database import into ERP systems
- Transform XLSX log data to CSV for ingestion by monitoring and analytics platforms like Splunk or ELK
How It Works
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.
Quality & Performance
CSV is a plain-text format that cannot represent formatting, formulas, charts, conditional formatting, data validation, or cell comments. All of these are lost during conversion. Merged cells are unmerged with the value placed in the top-left cell. Multiple worksheets require separate CSV files. If your workflow requires preserving formulas or formatting, consider keeping the XLSX as the primary file and using CSV only for data exchange.
Device Compatibility
| Device | XLSX | CSV |
|---|---|---|
| Windows | Native | Native |
| macOS | Native | Native |
| iOS | Partial | Partial |
| Android | Partial | Partial |
| Linux | Partial | Native |
| ChromeOS | Partial | Native |
Tips for Best Results
- 1Check that formulas have been evaluated correctly by comparing a few key values between the XLSX and CSV output
- 2Use ISO 8601 date format (YYYY-MM-DD) to avoid ambiguity when importing the CSV into databases or analysis tools
- 3Remove empty rows and columns from the XLSX before conversion to produce a cleaner CSV without unnecessary delimiters
- 4For multi-sheet workbooks, convert each sheet separately and verify the correct sheet was exported
- 5If your downstream tool expects a specific delimiter (semicolon, tab), configure the output format accordingly before conversion
Related Conversions
XLSX to CSV conversion is essential for anyone who needs to move spreadsheet data into databases, scripts, APIs, or analysis tools. Our converter accurately evaluates formulas, handles encoding correctly, and produces clean RFC 4180-compliant CSV ready for any data pipeline.