Omni Converter

Convert

JSON to XLSX

Turn an array of objects into a workbook: keys become the header row, numbers stay numbers so Excel can sum them.

Runs in your browser. Nothing is uploaded, nothing is stored, and the XLSX output is validated before you see it.

Open the converterFree. No account. Drop several files at once if you like.

How it works

  1. Drop, pick or paste your JSON file. It is recognised the moment it lands.
  2. Choose JSON to Excel workbook. Only conversions this file can really do are offered.
  3. Save. One file, a bundle, or a whole folder. On iPhone the share sheet opens so it lands in Files or Photos.

What you get

  • Excel
  • Header row
  • Typed numbers

Engine: Native JSON + OOXML writer. Accepted inputs: JSON.

Questions

Is my JSON file uploaded?
No. The conversion runs inside your browser with WebAssembly and native browser decoders. The file never leaves your device; you can watch the Network tab stay empty while it converts.
Is there a file size or daily limit?
No limit set by us. The only ceiling is your device's memory, because everything happens locally. There is no queue, no account requirement and no daily count.
How do I know the XLSX output is valid?
Every output is checked before it is offered: the bytes are re-read and the format signature, size and structure are verified. If a result cannot be validated it is not shown as a result.
Does it work on iPhone and iPad?
Yes. The same app runs in Safari and as the Omni Converter app on iOS, where Save opens the share sheet so the file lands in Files, Photos or any app you choose.

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