XLSX to JSON Converter
Convert any .xlsx
file to JSON right in your browser. Clean data rows for your app or AI, or the
lossless workbook — your files never leave your device.
Drag & drop an .xlsx file above, or click Open File to convert.
Private by design
Conversion runs locally in your browser. Your spreadsheet is never uploaded to a server.
Two JSON formats
Clean array-of-objects data rows for apps and AI, or the lossless ReoGrid JSON workbook.
Instant, no install
No Excel, no download, no plugin. Drop a file and the JSON appears next to the grid.
AI & API ready
Copy the data rows straight into an API request, a database import, or an LLM prompt.
How to convert XLSX to JSON online
- 1
Click Open File above, or drag your
.xlsxfile onto the page. - 2
The spreadsheet renders on the left and its JSON appears on the right — instantly, in your browser.
- 3
Toggle between Data rows (app-friendly) and ReoGrid JSON (lossless), then Copy or Download.
🧩 Two JSON formats, one click
Pick the shape that fits your use case:
- Data rows — a clean array of objects keyed by the header row (
[{ Product: 'Widget', Price: '9.99' }, …]). Perfect for posting to an API, importing into a database, or feeding an LLM. - ReoGrid JSON — the lossless native workbook format that also keeps styles, formulas, merges, and cell types, so you can round-trip the file without going through xlsx.
🔒 Why your files stay private
Most "online converters" upload your file to a server to process it — risky for confidential spreadsheets. This converter is different: it reads the file directly in your browser using the File API and converts it on the spot. Your data never travels over the network, so it is safe even for sensitive financial, HR, or business documents.
Want to convert XLSX to JSON in your own app?
This tool is powered by ReoGrid — a fast, Excel-like spreadsheet component for
the web. Load an xlsx and call toJson(), or read the cell values out as rows. It
takes only a few lines of code in React, Vue, or vanilla JS.
Just want to read an Excel file?
Open and view any .xlsx in your browser with our free, no-upload viewer.
Frequently asked questions
Is this XLSX to JSON converter free? ▾
Yes. Converting Excel files to JSON here is completely free — no account, no email, and no limit on how many files you convert.
Are my files uploaded to a server? ▾
No. The converter reads and parses your file locally with the browser File API. Your spreadsheet never leaves your device, so it is safe for confidential data.
What's the difference between 'Data rows' and 'ReoGrid JSON'? ▾
Data rows is a clean array of objects keyed by the header row — ideal for APIs, databases, and AI. ReoGrid JSON is the lossless native format that also preserves styles, formulas, merges, and cell types for round-tripping.
Does it handle formulas and formatted numbers? ▾
Yes. Data rows use the displayed value, so formulas are evaluated and number formats applied (e.g. "$9.99"). ReoGrid JSON additionally keeps the formula source for full fidelity.
Can I convert XLSX to JSON in my own app? ▾
Yes — this tool is powered by ReoGrid, a JavaScript spreadsheet component. Load an xlsx and call toJson(), or read the cell values out as rows. See the docs and recipe linked below.
Does it work offline? ▾
Once the page has loaded, conversion runs entirely in the browser, so it works even without an internet connection.