Why convert XLSX to JSON?
Converting from Microsoft Excel Spreadsheet (XLSX) to JavaScript Object Notation (JSON) is a common need in daily workflows. Whether you need to import data into a spreadsheet, export for analysis, or transform data for an API, choosing the right data format is essential.
With OmniConvert, the entire XLSX to JSON conversion process happens right in your browser using SheetJS — a pure JavaScript library that works on every device, including mobile phones. No plugins, no installs, no file uploads. Your data stays 100% private and never leaves your device.
Key Benefits of OmniConvert
Privacy Protected
Your XLSX files are converted locally in your browser. Never uploaded to servers.
Fast & Free
No waiting queues, no subscriptions. Convert unlimited files.
High Quality
Advanced algorithms ensure your JSON output preserves the highest quality.
Works Offline
Functions without internet after initial load via PWA support.
How to Use
Drag and drop your XLSX file into the conversion area above.
The browser processes the conversion instantly — no waiting required.
Click the download button to save your new JSON file.
XLSX vs JSON: Quick Comparison
| Feature | XLSX | JSON |
|---|---|---|
| Compression | ZIP-based (XML inside) | None (plain text) |
| Transparency | N/A | N/A |
| Color Depth | N/A | N/A |
| Animation | N/A | N/A |
| Best For | Spreadsheets, formulas, charts, multi-sheet workbooks | APIs, web applications, configuration files, data interchange |
Understanding XLSX and JSON Formats
XLSX is best suited for spreadsheets, formulas, charts, multi-sheet workbooks. It uses zip-based (xml inside) compression and does not support transparency. On the other hand, JSON excels at apis, web applications, configuration files, data interchange, using none (plain text) compression without transparency. Understanding these differences helps you choose the right format for each project and workflow.
Common Use Cases for XLSX to JSON Conversion
Data analysts converting XLSX to JSON for compatibility with different data analysis tools and spreadsheet applications.
Developers transforming XLSX data exports to JSON format for integration with web APIs or databases.
Business users preparing XLSX reports in JSON format for stakeholders who prefer a different tool.
Automating data pipeline transformations by converting XLSX files to JSON for downstream processing.
Pro Tips for XLSX to JSON Conversion
OmniConvert uses SheetJS (pure JavaScript) for data conversion — no WebAssembly needed, works on all devices including mobile.
Your data files are processed entirely in your browser — they never leave your device, ensuring complete privacy.
The conversion is near-instant for most files. Large spreadsheets (100K+ rows) may take a few seconds.