XLSB to JSON Converter Online — Free, No Upload

Convert XLSB to JSON Online

Need to turn a spreadsheet into structured data for your application? XLSB Viewer lets you convert any XLSB, XLSX, or XLS file to JSON directly in your browser. Drop your file above, click the JSON toggle, and download your data in seconds.

All conversion happens client-side using WebAssembly. Your file is never sent to a server, making this the safest way to convert sensitive spreadsheet data to JSON.

Three JSON Output Formats

Records Format

Each row becomes a JSON object with column headers as keys. This is the most common format for APIs and databases.

[
  { "Name": "Alice", "Age": 30, "City": "London" },
  { "Name": "Bob", "Age": 25, "City": "Paris" }
]

Array Format

A 2D array where the first row contains headers. Useful for CSV-like processing and data science workflows.

[
  ["Name", "Age", "City"],
  ["Alice", 30, "London"],
  ["Bob", 25, "Paris"]
]

Columnar Format

Data organized by column. Ideal for analytics, charting libraries, and column-oriented databases.

{
  "Name": ["Alice", "Bob"],
  "Age": [30, 25],
  "City": ["London", "Paris"]
}

How to Convert XLSB to JSON

1. Drag and drop your XLSB file onto the upload area above.
2. Click the JSON button in the top-right header bar.
3. Select your preferred format: records, array, or columnar.
4. Click Download to save the JSON file, or Copy to copy it to your clipboard.