Frequently asked questions
Everything you need to know about the converter.
01Is my data uploaded to a server?
No. Every conversion runs entirely in your browser using JavaScript. Your files and text never leave your device, which keeps sensitive data fully private.
02Which formats are supported?
JSON, Excel (.xlsx/.xls/.xlsm), CSV, TSV, YAML, XML, Markdown tables and SQL INSERT statements — any pair can be converted in either direction.
03Can it handle nested JSON?
Yes. You can flatten nested objects into dotted keys, preserve the original structure, or expand arrays — choose the strategy in the options panel.
04Does it support multi-sheet Excel files?
Yes. The converter reads all sheet names; the first sheet is parsed by default and metadata exposes the full list for advanced workflows.
05Will Chinese / GBK CSV files display correctly?
Yes. Select GBK or Big5 as the input encoding. Real multi-byte decoding is performed via the browser TextDecoder — no garbled characters.
06Is there a file size limit?
There is no hard limit beyond your device's memory. Virtualized rendering and streaming parsing keep things smooth up to hundreds of thousands of rows.