Drop CSV file here
or click to browse · supports multiple files for batch
No upload. No registration. Your data never leaves your device. Nested JSON mapping, batch processing, smart type detection.
Drop CSV file here
or click to browse · supports multiple files for batch
Your CSV files never leave your browser. Zero upload. Works offline after page load.
Convert flat columns like address.city into nested JSON objects. No competitor does this.
Drop multiple CSV files at once. Download all as ZIP or merge into one JSON array.
5 free conversions, no registration. Lifetime license $5 for unlimited use. No subscription.
Yes. All processing happens in your browser using Web Workers. Your CSV data is never uploaded to any server. Zero network requests after the page loads.
Instead of flat keys like {"address.city": "Moscow"}, you get nested objects: {"address": {"city": "Moscow"}}. Enable it in Settings → Nested Mapping → Dot-notation.
5 free conversions with full functionality. After that, a one-time $5 payment (USDT TRC-20) gives you unlimited lifetime access. No subscription, no recurring fees.
Files up to 50MB work smoothly thanks to Web Workers (non-blocking UI). For larger files, you may experience slower parsing but it still works.