Convert XLSX to JSON
The way to convert XLSX to JSON here is to drop your .xlsx workbook into the converter on this page and press Convert to JSON. A spreadsheet engine running as JavaScript in your browser reads the cells, so the workbook is processed on your machine and not handed to any server.
Runs in your browser. Your file never leaves your device.Drop your XLSX hereChoose a XLSX to convert
It becomes a JSON right in your browser, up to 100 MB
Your file never leaves your device
Works in airplane mode. See the proof
Limits, published exactly
| Where it runs | In your browser. The file never leaves your device. |
|---|---|
| Free conversions | Unlimited. No account, no ads, no queue, no watermark. |
| Max file size, free | 100 MB |
Why convert XLSX to JSON?
This is the move when spreadsheet data has to become something a program can consume. Business data lives in Excel, but code wants JSON: an array of objects it can loop over, validate or load into a database. Rather than copy-paste columns or write a one-off parser, you convert the workbook directly into the shape a developer actually wants. It is ideal for turning a hand-maintained reference sheet, an export someone emailed you, or a list a non-technical colleague keeps in Excel into structured data you can wire into an app or an API.
What is XLSX?
XLSX is the Excel workbook format introduced with Office 2007: a zip archive of XML sheets, styles and formulas. It is the default container for tabular data in business, but a workbook is a living calculation, not a document, so layouts shift between Excel versions and alternative spreadsheet apps. Exporting to PDF pins the printed view of each sheet so the numbers land in front of the reader exactly once, exactly as formatted.
What is JSON?
JSON is the lingua franca of APIs and config: nested objects and arrays in a compact, human-readable text form that almost every language can parse. It handles structured and hierarchical data that a flat table cannot. For tabular data it is often paired with CSV, and for configuration with YAML.
Quality and what to expect
Set expectations on what comes across. Only the first sheet in the workbook is read; additional sheets are ignored, so split anything you need out of the others beforehand. The conversion captures cell values only: text, numbers, dates and booleans become an array of objects keyed by the header row. Formatting, colours, charts, merged-cell styling and the like are not represented, because JSON carries data, not presentation. Formulas come through as their last computed values rather than as the formula text. The result is a developer-friendly array, faithful to the numbers and labels but stripped of everything visual.
XLSX to JSON FAQ
Does this read all the sheets in my workbook?
No, only the first sheet is converted. Any other tabs are ignored, so if the data you need lives on a second sheet, move or copy it to the first sheet before converting the workbook.
Do formulas come through as formulas?
No. The converter takes each cell value, so a formula appears as its computed result, not as the formula expression. If a cell shows 42 from a SUM, the JSON contains 42, not the underlying formula.
What about cell colours, charts and formatting?
None of that is included. JSON holds data, not presentation, so styling, conditional formatting, embedded charts and merged-cell decoration are all left out. You get the values and the header keys, nothing visual.
Is my spreadsheet uploaded to be read?
It is not. SheetJS parses the workbook as JavaScript inside this browser tab, so the file stays on your device. Even a spreadsheet full of confidential figures is never transmitted during the conversion.