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Spreadsheet tool
Convert CSV to XLSX or Excel back to CSV. Preview the table before you download.
CSV ↔ Excel Converter turns CSV tables into .xlsx workbooks and Excel sheets back into CSV — privately in your browser. Use it when a system only accepts one format, or when you need a portable CSV copy of a spreadsheet.
Many tools speak only CSV (import pipelines, scripts, some CRMs), while stakeholders prefer Excel for filters and formatting. Converting both ways without emailing files to random online services keeps customer lists and financial exports under your control.
When converting Excel → CSV, remember that CSV is a single flat table: one sheet, no formulas, limited type information. Pick the sheet that holds the real data. When converting CSV → Excel, you get a simple workbook you can open in Excel, LibreOffice, or Numbers.
Save intermediate CSVs as UTF-8 so international text survives the round trip. If Excel mangles characters on re-open, choose “CSV UTF-8” on export from Excel, or open the UTF-8 file via Data → From Text/CSV with UTF-8 selected.
Spreadsheet tools on ezToolFlow process CSV/Excel-style data in the browser when possible. Prefer UTF-8 CSV for best compatibility.
Upload a .csv to produce XLSX, or an .xlsx/.xls file to produce CSV. Stay within browser-friendly file sizes.
Preview headers and rows. For workbooks with multiple sheets, select the sheet you want flattened to CSV.
Save the converted file and open it in your target app or pipeline. Re-run with a different sheet if needed.
Turn finance or ops Excel files into CSV for ETL scripts and bulk upload forms.
Package a clean CSV export as XLSX for people who only work in spreadsheets.
Pull one tab out of a large workbook into a lightweight CSV for long-term storage.
Quick answers about tools, privacy, limits, and pricing.
About 20 MB is recommended so the browser stays responsive. Very large sheets may freeze on low-memory devices.
No. CSV stores values only. Export calculated results from Excel first if you need formula outputs in the CSV.
Yes. The converter is built for browser-side processing so you are not forced to upload sensitive tables to a third-party server for this step.
CSV represents one table. Convert each sheet separately, or merge sheets first with Merge CSV after exporting each tab.
Regional Excel settings sometimes expect semicolons. Open the CSV via Excel’s import wizard and set comma + UTF-8, or open the XLSX version instead.
Keep conversions around 20 MB or smaller for reliable browser performance. Split huge files with Split CSV first if needed.
No. This tool maps tabular cell data. Charts, pivots, and formatting beyond the grid are not carried into CSV.
Yes. CSV ↔ Excel Converter is free to use on ezToolFlow. Guests and free accounts may have daily limits on some tools; premium tiers can raise or remove those limits. AI tools may also spend credits.
For browser-based tools, processing runs on your device when possible and files are not uploaded for conversion. Optional accounts, usage limits, and AI features are described in our Privacy Policy.
No for most tools — you can start as a guest. An account helps keep higher daily limits and saved work (for example AI resumes).
Keep working with similar free tools — no signup required for most.
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