JSON, CSV, YAML & Excel converter
Convert flat JSON and CSV, YAML and JSON, or an Excel worksheet to CSV locally.
How to use this tool
- Choose a conversion and paste text or add a file up to 5 MB.
- Excel files expose a worksheet selector after reading. Pick the sheet you need.
- Run, inspect the output, and download. CSV exports protect formula-like text with an apostrophe.
Keep the original files and inspect the exported result before publishing or sharing it. Processing happens on this device; engine and library assets download when needed.
Frequently asked questions
Will CSV retain my JSON types?
No. CSV is text. CSV to JSON keeps every cell as a string, including numbers and dates. Null and missing JSON values become empty cells. Only flat arrays of objects convert to CSV.
What happens to Excel formatting?
Only the selected worksheet’s displayed values are exported. Formulas are not calculated here, charts and formatting are discarded, and cached formula results may be missing. Check the CSV before using it.
Are all YAML features supported?
JSON-compatible YAML scalar, array and object data is supported. Custom tags, anchors and aliases are rejected; comments and formatting do not survive. Limits are 20,000 rows and 200,000 cells.
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