How it works
Add your CSV file. MimiFile checks the format, converts it to JSON Lines / NDJSON, and provides a temporary download when the result is ready.
Convert structured data from CSV to JSON Lines / NDJSON online. MimiFile reads the source records, converts supported values and provides a temporary download.
CSV → JSONL
Drag and drop, paste a file, or browse your device.
Files are temporary and deleted automatically.
Limits: 50 MB per file · 128 MB total per batch.
Add your CSV file. MimiFile checks the format, converts it to JSON Lines / NDJSON, and provides a temporary download when the result is ready.
Typed, nested and binary columns do not map identically between every data format. Review the result when the destination has a simpler type system.
Current source limit : 50 MB per file. Up to 10 files can be submitted in a batch, subject to the global batch ceiling.
Parquet, Avro, ORC and Arrow can carry rich typed schemas, while CSV and spreadsheets are flatter. MimiFile keeps compatible types and converts values that need a simpler representation.
When a tabular destination cannot represent lists or objects directly, nested values are serialized as JSON text where supported instead of being silently discarded.
Nulls and timestamps are preserved when the destination supports them. Binary values can be represented as Base64 text in text-based or spreadsheet outputs.
Check column types, null values, timestamps and nested fields before using the converted file in a production data pipeline.