Convert your .xlsx files to .csv format online for free. No software to install. Fast, secure, and easy.
Free — 3 conversions per day
Drag and drop your .xlsx file or click to browse.
Select CSV as your output format.
Click Convert and download your .csv file.
CSV is the universal data interchange format that every database, programming language, and data tool can read. Converting Excel spreadsheets to CSV strips the formatting and formulas, keeping only the raw cell values in a portable plain-text format that can be imported anywhere — from PostgreSQL to Python pandas to Salesforce.
XLSX (Office Open XML Spreadsheet, introduced in 2007) uses ZIP (containing XML parts) compression. CSV (Comma-Separated Values, introduced in 1972) uses None (plain text) compression. XLSX browser support: None (requires office application or online viewer). CSV browser support: Universal (displayed as plain text).
The conversion is lossy in the sense that all formatting, formulas, charts, images, and multiple sheets are stripped. Only the raw cell values of the active sheet are preserved. Formulas are replaced by their calculated values. Dates and numbers may be affected by locale-specific formatting (e.g., comma vs. period for decimals).
Typical XLSX file size: A 10,000-row spreadsheet with formulas: ~500 KB - 2 MB. Typical CSV file size: 100,000 rows x 10 columns of text: ~5-15 MB.
Before converting, verify that your number columns do not have leading zeros that need preserving (like ZIP codes or phone numbers) — CSV has no data type information and leading zeros may be dropped. If your spreadsheet has multiple sheets, you will need to convert each sheet separately since CSV supports only a single table.
Convert XLSX to CSV with 3 free conversions per day. No hidden fees.
Create a free account in 10 seconds and start converting immediately. No credit card required.
Files are encrypted during transfer, processed on secure servers, and deleted immediately after conversion.
Convert files from any device — desktop, tablet, or phone. No software to install, works in any modern browser.
SquishConvert supports over 358 file conversion combinations across images, documents, audio, and video.
Your converted .csv file maintains the best possible quality. No unnecessary compression or quality loss.
You get 3 free conversions per day. Upgrade to Pro for unlimited conversions.
Most files convert in under 10 seconds. Larger files may take a bit longer depending on size.
Yes. Files are encrypted during transfer, processed on secure servers, and deleted immediately after conversion. We never store your files.
Currently, SquishConvert converts one file at a time. Batch conversion is coming soon — stay tuned!
Free users can convert files up to 10 MB. Pro users can convert files up to 500 MB.