Convert CSV to NDJSON Online
Convert CSV files to NDJSON format directly in your browser. No upload required — your data never leaves your device.
About this conversion
Converting CSV to NDJSON produces a file where each row becomes an independent JSON object on its own line — the format required for Elasticsearch bulk indexing, OpenSearch inserts, CouchDB bulk updates, and streaming data pipelines that process records one at a time. Each line in the output is individually parseable without buffering the entire file.
Common use cases include preparing tabular data for Elasticsearch or OpenSearch bulk indexing (where each document is a separate NDJSON line), feeding data into a streaming pipeline or queue consumer, converting database exports for a document store, and creating incremental data files that can be appended to without breaking downstream parsers.
Not sure which format you need? Read our NDJSON vs CSV comparison for a side-by-side breakdown.
Frequently Asked Questions
What is NDJSON format?
NDJSON (Newline-Delimited JSON) stores one JSON object per line, making it easy to stream, append, and process incrementally.
Is my CSV data private?
Yes — completely. Your file is never uploaded to any server. All conversion happens inside your browser using WebAssembly — locally, with no upload. Once you close the tab, nothing is retained.
What is the maximum file size?
The free limit is 50 MB. For larger files, performance depends on your device's available memory — most modern machines can handle 500 MB to 1 GB comfortably.
What is the difference between CSV and NDJSON?
CSV is the universal tabular format. NDJSON is better for streaming systems, document databases, and pipelines that process one record at a time.
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