Convert XLSX to JSON

Turns spreadsheet rows into JSON objects, using the header row for keys.

What to expect

Formulas become values. Cell formatting, merged cells and anything outside the used range are dropped.

Why convert XLSX without uploading

Most online converters take your file, send it to their servers, convert it there and hand back a download link. That means your document sits on someone else's disk, subject to their retention policy and their breaches. It also means you cannot use them offline, and cannot use them at all for anything confidential.

frogConvert does the conversion in the page itself, with Pandoc compiled to WebAssembly. There is no upload step because there is no server. You can disconnect from the network and it still works.

About the formats

XLSX

Microsoft Excel's format: multiple sheets, formulas, cell formatting and charts in a ZIP of XML. Only the cell values survive a conversion to a flat tabular format. More about XLSX files.

JSON

The default interchange format for structured data on the web: objects, arrays, strings, numbers, booleans and null. No comments, no date type, no schema. More about JSON files.

Common questions

Is my file uploaded when converting XLSX to JSON?

No. The conversion runs entirely in your browser. The file never leaves your device, there is no server to upload to, and the page works offline once loaded.

Is XLSX to JSON conversion free?

Yes, with no account, no watermark and no file limit per day. frogConvert is open source and there is no server cost to recover, because your device does the work.

How large a file can I convert?

Up to 2 GB for a single file, 500 MB total per batch, and 300 files at once. The practical limit is your device's memory, since everything is processed locally.

What is lost converting XLSX to JSON?

Formulas become values. Cell formatting, merged cells and anything outside the used range are dropped.