Are my JSON files uploaded anywhere?

No. This conversion runs entirely inside your browser, so the file never leaves your device. You can confirm it yourself: open the network tab of your browser's developer tools and watch that nothing is sent while the file converts.

Is converting JSON to XLSX free?

Yes, without a limit on how many files you convert and with no watermark on the result. Files up to 100 MB are covered by the free plan.

Does converting JSON to XLSX lose quality?

JSON and XLSX describe content in fundamentally different ways, so the conversion is a reconstruction rather than a copy. The result is faithful, but not byte-for-byte equivalent. Nested objects are flattened into columns. Deeply nested data loses its shape.

Do I need to install anything to open XLSX files?

No installation is needed for the conversion itself — it runs in the browser you already have. Opening the XLSX afterwards needs whatever software normally handles Excel Workbook on your device.

JSONtoXLSX

Convert JSON to XLSX

Up to 3 files at once, 100 with Pro. Mixed formats are fine.

You can convert JSON to XLSX free and without an account: drop the file above and the XLSX is ready to download in a second or two. The conversion happens inside your own browser, so the file is never uploaded — it works on Windows, Mac, Linux, iPhone and Android, and keeps working with the network switched off.

What JSON and XLSX are for

The data format of the web. Nested structures, read by every programming language.

The Excel format since 2007. Several sheets, formulas, formatting.

How to convert JSON to XLSX

Drop your JSON file onto this page, or click to pick one.
Choose XLSX as the target. The conversion runs inside your browser — the file is never uploaded.
Download the finished XLSX file.

JSON vs XLSX: what changes

JSON compared with XLSX
	JSON	XLSX
Full name	JavaScript Object Notation	Excel Workbook
File extension	.json	.xlsx
Media type	application/json	application/vnd.openxmlformats-officedocument.spreadsheetml.sheet

Quality: The result is a close reconstruction rather than an exact copy. Check it before relying on it.
Where it runs: This conversion runs inside your browser. Your file is never uploaded, and it works with the network disconnected.
What can be lost: Nested objects are flattened into columns. Deeply nested data loses its shape.

JSON to XLSX: common questions

Are my JSON files uploaded anywhere?: No. This conversion runs entirely inside your browser, so the file never leaves your device. You can confirm it yourself: open the network tab of your browser's developer tools and watch that nothing is sent while the file converts.
Is converting JSON to XLSX free?: Yes, without a limit on how many files you convert and with no watermark on the result. Files up to 100 MB are covered by the free plan.
Does converting JSON to XLSX lose quality?: JSON and XLSX describe content in fundamentally different ways, so the conversion is a reconstruction rather than a copy. The result is faithful, but not byte-for-byte equivalent. Nested objects are flattened into columns. Deeply nested data loses its shape.
Do I need to install anything to open XLSX files?: No installation is needed for the conversion itself — it runs in the browser you already have. Opening the XLSX afterwards needs whatever software normally handles Excel Workbook on your device.