Excel to JSON Converter

Load `.xlsx` or `.xls` sheets and export JSON without installing desktop software.

📊

Click to upload Excel file

Supports .xlsx, .xls, .csv, .tsv files

— or paste data directly from Excel —

💡 Privacy: Your file is processed entirely in your browser. No data is uploaded to any server.

From Excel workbooks to JSON

Business data often lives in Excel long before it reaches an API. CalcForge reads spreadsheet files in the browser, lets you pick a sheet, and converts rows into JSON structures—no Office license or server upload required.

Good fits

Bootstrapping JSON fixtures from stakeholder-maintained workbooks
One-off migrations from legacy Excel-driven workflows
Previewing sheet shape before automating with a script
Combining with CSV export when you only need a single tab

Sheet "Users"
| id | name |
| 1  | Ada  |

JSON:
[{"id":1,"name":"Ada"}]

Practical notes

Merged cells and formulas may not round-trip—paste values in Excel first if results look odd.
Date cells follow serial conversion rules; verify timezone-sensitive fields manually.
Sensitive workbooks stay on your machine—close the tab when finished on shared computers.

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Frequently asked questions

Which Excel formats are supported?

Modern `.xlsx` and legacy `.xls` are commonly supported. If a file fails, re-save as xlsx from Excel and retry.

Can I choose which sheet to convert?

Yes. Multi-sheet workbooks let you select the tab before conversion.

Are macros executed?

No. Only cell values are read—macros and external links are ignored for safety.

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