XLSX to JSON Converter
Turn an Excel .xlsx sheet into structured JSON in your browser. Exact-format URL; Excel-branded alias: /converters/excel-to-json.
Structured JSON, pretty-printed and ready to consume.
Choose a file or drag and drop
Drop your Excel file here or
Choose file · Drag & drop · Public file link
- Processed on your device
- No conversion file stored on our servers
- Maximum file size: 100 MB
Conversion runs in your browser. Files are not uploaded to Format Convertly servers.
Processed on your device
No conversion file stored on our servers
Conversion Settings
Customize the output to match your needs.
Convert Quality
92%Quality slider applies when the target is JPG, WebP, or AVIF.
Output
Output options for this format are applied automatically during browser conversion. Drop your file above to begin.
Advanced settings
Additional Options
How to Convert XLSX to JSON
Add your XLSX
Drop a XLSX file into the browser panel. Nothing is sent to a remote queue.
Confirm settings
Review optional quality/size settings, then confirm JSON as the output.
Download JSON
Convert locally and download the JSON file when processing finishes.
Why Convert XLSX to JSON?
Private by design
XLSX → JSON runs in your browser. Files are not uploaded to a remote conversion queue.
Ready for the next step
Convert when a site, editor, or teammate expects JSON instead of XLSX.
Preserve detail
JSON: none or container. Typically lossless or lightly transformed for editing and archival use.
Wide compatibility
XLSX is commonly used for Financial models and Operational trackers.
XLSX vs JSON
A quick side-by-side before you convert — deeper comparison lives on the full guide.
| Feature | XLSX | JSON |
|---|---|---|
| Kind | spreadsheet | structured data |
| Compression | none or container | none or container |
| Lossy / lossless | Lossless / not lossy | Lossless / not lossy |
| Transparency | Not supported / N/A | Not supported / N/A |
| Best for | Financial models; Operational trackers | REST API bodies; App configuration (package.json and friends) |
| Typical size | Small to large depending on data and embedded images | Compact; pretty-print increases size for readability |
| Browser / web support | Edit via Sheets/Excel online; not a native browser grid format | Native JSON.parse / fetch; not a document viewer format |
| Compatibility | Opens in Excel, Google Sheets, LibreOffice Calc, and Numbers with occasional formula quirks — the spreadsheet exchange default | Native in JavaScript; first-class libraries in every major language |
Choose XLSX when…
- Financial models
- Operational trackers
- Formatted reports
- Data analysis in Excel/Sheets
Choose JSON when…
- REST API bodies
- App configuration (package.json and friends)
- NoSQL document exports
- Interchange between services
What happens during document conversion?
XLSX: XLSX compression: none or container. Lossless (or non-destructive packaging) keeps reconstructable data — size savings come from packing efficiency, not throwing detail away. Typical size profile: Small to large depending on data and embedded images. Quality note: Full spreadsheet fidelity in Excel-compatible apps JSON: JSON compression: none or container. Lossless (or non-destructive packaging) keeps reconstructable data — size savings come from packing efficiency, not throwing detail away. Typical size profile: Compact; pretty-print increases size for readability. Quality note: Exact for supported literal types; no native date type Structured JSON, pretty-printed and ready to consume.
Tip
Keep an original copy of your XLSX file if you may need to reconvert later.
When should I use JSON?
JSON: JSON is the default payload for web APIs and many app configs. It maps cleanly to programming types. Convert JSON to CSV when analysts need a flat table, or to YAML when humans must edit the same data as config. Best for REST API bodies and App configuration (package.json and friends).
JSON format guide →When should I keep XLSX?
Keep XLSX when you still need to edit or when it already matches your audience. XLSX is the business default for spreadsheets: multiple sheets, formulas, pivot-friendly data, and formatting. Use CSV when you only need raw values for import, and PDF when you need a non-editable snapshot of a report.
XLSX format guide →XLSX · JSON
Related converters XLSX
Related converters JSON
Frequently Asked Questions
More on quality loss: conversion quality guides · problem-solution guides
Does converting XLSX to JSON reduce quality?
Often no for lossless or remux-style paths. Quality drops when you re-encode with lossy settings, downscale, or flatten features like transparency.
Can you recover quality after converting?
Not from a lossy output alone. Return to the original master (or a better source). Converting to a lossless format does not resurrect discarded detail.
Where can I learn more about conversion quality?
Browse Format Convertly’s Quality guides for topics like whether conversion reduces quality, JPG↔PNG myths, WebP/MP3/MP4 tradeoffs, recovery limits, and generational loss — each links to the right converter.
Are formulas kept?
JSON stores values, not live Excel formulas.
Is my workbook uploaded?
No. Conversion stays in the browser.
What is a XLSX file?
XLSX is a Microsoft Excel Open XML workbook for spreadsheets, formulas, and charts. XLSX is the business default for spreadsheets: multiple sheets, formulas, pivot-friendly data, and formatting. Use CSV when you only need raw values for import, and PDF when you need a non-editable snapshot of a report.
What is a JSON file?
JSON is a lightweight text format for structured data (objects, arrays, strings, numbers, booleans, null). JSON is the default payload for web APIs and many app configs. It maps cleanly to programming types. Convert JSON to CSV when analysts need a flat table, or to YAML when humans must edit the same data as config.
Is XLSX to JSON free?
Yes. Format Convertly conversions are free to use in your browser with no signup required.
Ready to Convert Your Files?
XLSX to JSON privately in your browser.