JSON/CSV ⇔ Excel Converter
Instantly convert between JSON/CSV and Excel (.xlsx)
Your data is never sent to a server. All processing happens in your browser.
Input
Output
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About JSON/CSV ⇔ Excel Converter
A completely free, browser-based conversion tool that lets you seamlessly convert between JSON/CSV data and Excel's .xlsx format. It supports both file imports and direct text input, utilizing the SheetJS library for fast, local processing.
Because no data is transmitted to a server, you can safely use it to convert confidential business or customer data.
How to Use
Select Direction
Choose whether you want to convert from JSON/CSV to Excel, or from Excel to JSON/CSV.
Input Data
Drop your file or paste your data directly into the text area (Excel files require dropping).
Convert & Download
Adjust your conversion options and click the download button to save your file.
Glossary
- JSON
- A lightweight data-interchange format frequently used for transmitting data between programs.
- CSV
- Text data where values are separated by commas. Extensively used for input/output in spreadsheet software and databases.
- .xlsx
- The standard file format for Microsoft Excel, internally structured as a ZIP archive containing XML data.
- SheetJS
- A powerful JavaScript library that enables reading and writing Excel files directly in the browser.
- Local Processing
- A method where calculations and operations occur solely on the user's device (browser). It is secure as no communication is involved.
- Sheet Name
- The name of the individual table (worksheet) included within an Excel workbook.
- BOM
- Byte Order Mark. A mark placed at the beginning of text data to indicate its character encoding.
- Character Encoding
- Rules that convert characters into data a computer can process. UTF-8 is generally recommended.
FAQ
- Q.Is my data saved on a server?
- No, your data is never sent to a server. All conversion processes happen completely within your browser, making it secure to use.
- Q.What is the maximum file size I can convert?
- It depends on your browser's memory limit, but typically files around a few MB to 10MB can be converted without issues.
- Q.What happens if my Excel file has multiple sheets?
- When converting from Excel to JSON/CSV, this tool only processes the first sheet (e.g., Sheet1).
- Q.Can I convert to Excel on my smartphone?
- Yes, it works on smartphone and tablet browsers as well, allowing you to download the converted file.
- Q.Is there a risk of information leakage?
- Because we use fully offline-capable scripts, there is no risk of your data leaking to external parties.
- Q.I get an error and cannot convert.
- Please check if your input JSON or CSV has correct syntax. For JSON, extra trailing commas or unclosed brackets are common causes.
Use Cases
Sharing Business Data
Convert JSON data exported from a system into Excel format to easily share with sales or planning teams.
Creating Test Data
Batch convert requirement data created in Excel by clients into JSON format to import into your application.
Analyzing Log Files
Convert server access logs (CSV) to Excel to perform detailed analysis using functions and pivot tables.
Converting Confidential Data
Safely convert confidential company data containing personal information locally without using online cloud conversion tools.
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