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 Excel CSV converter

Convert Excel spreadsheets to CSV or convert CSV files to Excel workbooks directly in your browser. Use batch conversion, worksheet selection, delimiter and encoding options, data preview, validation checks, and ZIP downloads while keeping files private on your device.

📂 Upload & Mode
⚙️ Options
🔎 Preview & Validation
Rows
0
Columns
0
Worksheets
0
Input size
0 B
Output size
0 B
Delimiter / Encoding
-
📦 Converted files
No registration required. Privacy-focused browser processing.

⭐ Excel CSV Converter - Explanation & Examples

The Excel CSV converter helps you switch between Excel and CSV formats in both directions. Upload one or more .xlsx, .xls, or .csv files, preview the data, validate issues, and download converted files one-by-one or as a ZIP archive.

⚙️ What You Can Convert

  • Excel to CSV: export one worksheet or all worksheets from a workbook
  • CSV to Excel: build a single workbook from one or many CSV files
  • Batch mode: process multiple files in one run and bulk download outputs

🔎 Data Accuracy Controls

  • Choose delimiters: comma, semicolon, tab, pipe, or custom
  • Select encodings: UTF-8, UTF-8 with BOM, UTF-16, ISO-8859-1
  • Trim spaces and optionally keep or remove empty rows
  • Keep formulas as values or formula expressions
  • Control date export format: original, ISO 8601, or custom format pattern

⚠️ Validation and Warnings

Before conversion, the tool checks for common CSV issues such as inconsistent column counts, malformed rows, and parsing errors. Warnings are shown with suggested fixes so you can adjust delimiter, encoding, or source formatting before export.

⭐ Privacy and Performance

File processing runs in your browser whenever possible. That means your spreadsheets and CSV data stay on your device, with no account or registration required. Large files are handled in a browser-friendly flow with quick preview and metadata summaries.

🔎 Example Workflow

  1. Drop three CSV files into the upload area.
  2. Enable merge into one workbook and keep header row frozen.
  3. Run conversion and verify row/column counts in the output panel.
  4. Download a single .xlsx file with one worksheet per CSV.

This tool is also known as

  • excel to csv converter online
  • csv to excel converter online
  • xlsx to csv converter browser
  • convert csv to xlsx free
  • batch excel csv converter

Frequently Asked Questions

It converts Excel files (.xlsx, .xls) to CSV and converts CSV files to Excel (.xlsx) directly in your browser.

Yes. You can upload multiple Excel and CSV files and run batch conversion in a single process.

Yes. You can export one selected worksheet or export all worksheets from each workbook to separate CSV files.

You can use comma, semicolon, tab, pipe, or set a custom delimiter for CSV export and import.

The tool supports UTF-8, UTF-8 with BOM, UTF-16, and ISO-8859-1 for CSV output, plus configurable encoding for CSV import.

Yes. It reports parsing errors, inconsistent column counts, and malformed rows with warning messages and suggested fixes.

Yes. Enable the merge option and the converter will create one workbook with one worksheet per uploaded CSV file.

Yes. You can preserve leading zeros so values like postal codes or product identifiers remain text in Excel.

Yes. When batch conversion produces multiple outputs, you can download all converted files in a single ZIP archive.

Yes. Processing is done in the browser whenever possible, so your files are handled locally without registration.

Yes. You can save delimiter, encoding, worksheet, and formatting settings in your browser for future sessions.

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