Your files never leave your computer
🔑
No uploads. No accounts. No telemetry. Everything runs in your browser.
Validate, pretty-print and minify JSON. Syntax errors highlighted with precise line numbers.
Batch convert CSV to JSON or JSON to CSV. Custom delimiters, nested objects supported.
Encode text or binary files to Base64. Standard and URL-safe variants, auto-detects on paste.
Convert XML to JSON and back. Attribute mapping, namespace-aware, schema-smart.
Convert .xlsx and .xls files to JSON or CSV. Multi-sheet support, column mapping.
Decode and inspect JWT tokens fully offline. View header, payload, expiry and algorithm claims.
Export SQL INSERT dumps or query results to JSON or CSV. Offline, instant.
Got a workflow that needs a new tool? Let me know — your request could be next.
Tell me what's working and what isn't.