Convert data formats without uploading anything
Free tools for JSON, CSV, XML, YAML and XLSX. Each one runs entirely in your browser, with no uploads and no sign-up.
- JSON to CSVFlattens nested objects, merges different keys into columns.
- CSV to JSONDetects the delimiter, keeps leading zeros, handles quoted fields.
- XML to JSONKeeps attributes, turns repeated elements into arrays, and reports the line of any XML error.
- JSON to XMLChoose the root element, write attributes with @ keys.
- YAML to JSONFollows YAML 1.2, expands anchors, combines multiple documents, and reports the line of any error.
- JSON to YAMLKeeps key order, quotes strings only when needed.
- CSV to XLSXKeeps leading zeros and long IDs intact.
- JSON CompareMatches arrays by ID, ignores key order, exports JSON Patch.
Why in the browser?
Data files often hold customer records, config values or API responses. Most online converters send your file to a server to process it. These tools do the work on your own device instead, so the file doesn't go anywhere. See how that works and how to check it.