How to convert XLSX to JSON
Converting XLSX to JSON takes three quick steps:
- Add one or more XLSX files — drag and drop them or click to browse.
- Click Convert to JSON and let the conversion run in your browser.
- Download your new JSON files individually or as a batch.
What is XLSX?
XLSX is the modern Microsoft Excel spreadsheet format. It stores multiple sheets, formulas, formatting and charts in a compressed XML package, and is the standard for sharing rich spreadsheets that go beyond plain CSV.
What is JSON?
JSON is the standard data format for web APIs and modern applications. It represents structured data with objects, arrays, strings and numbers in a lightweight, human-readable text format that every programming language can parse.
XLSX vs JSON: how they compare
Both formats have their place. This table summarises the practical differences so you can pick the right one for the job.
| XLSX | JSON | |
|---|---|---|
| Format type | Data | Data |
| Compression | Zipped XML | None |
| Quality | Lossless | Lossless |
| Best for | Rich spreadsheets with formulas | Web APIs and config files |
Why convert XLSX to JSON?
Converting XLSX to JSON gives you a file that is better suited to web apis and config files and structured and nested data, and that opens it up to far more apps, devices and websites.
What JSON gives you: native to JavaScript and every language, supports nesting and data types and human-readable.
Where XLSX falls short: needs spreadsheet software, heavier than CSV and harder to parse programmatically than CSV. Converting keeps your content while moving to a format that matches where the file is going.
Tips for the best results
- JSON is lossless, so your converted files keep every detail of the original XLSX.
- You can convert several files in one go — add as many XLSX files as you like and download them together.
- Everything runs locally in your browser, so even large files convert quickly and nothing is uploaded.
XLSX to JSON — frequently asked questions
- How do I convert XLSX to JSON?
- Add your XLSX file, click Convert to JSON, and download the JSON result. The whole process happens in your browser and takes just a few seconds.
- Is it free to convert XLSX to JSON?
- Yes. This XLSX to JSON converter is completely free with no sign-up, no watermarks and no limit on the number of files you can convert.
- Are my XLSX files uploaded to a server?
- No. Conversion runs entirely on your device using your browser, so your files never leave your computer or phone.
- Does converting XLSX to JSON reduce quality?
- No. JSON is a lossless format, so the conversion preserves the full quality of your original XLSX.
- Can I convert multiple XLSX files at once?
- Yes. Add as many XLSX files as you like and convert them in a single batch, then download each JSON result.