CSV to NDJSON Converter
Convert CSV to NDJSON / JSON Lines. Free, private, processed in memory — nothing is stored.
Complete the security check to begin
CSV to NDJSON, the private way
Stream CSV rows out as newline-delimited JSON objects for ingestion into log stores and data warehouses.
- Header row becomes object keys
- One JSON object per line
- Auto encoding detection
About Converting CSV to NDJSON
CSV is a plain-text table format where each line is a row and commas separate columns. Its simplicity makes it the universal exchange format for data between spreadsheets, databases and code. When you need to move away from CSV, the usual reason is simple: no formatting, formulas or multiple sheets.
Converting your CSV spreadsheet to NDJSON solves that. NDJSON stores one JSON object per line, making it ideal for streaming and processing large datasets record by record without loading the whole file into memory. In practice you gain streamable line by line and great for logs and big data. PrivConvert runs the whole CSV-to-NDJSON conversion in server memory and deletes your file the instant the NDJSON is ready — nothing is stored, logged or reused.
When this conversion helps
- You need streamable line by line
- You need great for logs and big data
- You need append-friendly
- Sharing a CSV spreadsheet with someone whose software expects NDJSON
Tips for best results
- After converting, open the NDJSON and skim the formatting — complex layouts occasionally need a small touch-up.
- Files up to 250 MB are supported, and you can batch-convert several CSV files at once; each is processed privately and deleted immediately.
How to Convert CSV to NDJSON Online
Turning a CSV file into NDJSON is straightforward here — upload, convert, download. What you gain with NDJSON: streamable line by line.
Drag and drop your file into the upload area, click to browse your device, or paste a URL to a file hosted online. You can upload files up to 250 MB and batch convert up to 20 files at once.
Once uploaded, the conversion from CSV to NDJSON starts automatically. The process runs entirely in an isolated environment - your data never leaves the secure pipeline.
Your converted file is ready instantly. Click the download button to save it to your device. The file is deleted from memory immediately after download.
Why convert CSV to NDJSON with PrivConvert?
PrivConvert turns your CSV into NDJSON without ever storing, logging or sharing it. Here is what that looks like in practice:
Convert instantly with no sign-up, no email and no profiling cookies. We never build a profile around you or the files you convert.
Runs in any modern browser on Windows, macOS, Linux, Android and iOS — no install, plugin or desktop software needed.
Each job runs in an isolated in-memory sandbox, so most conversions finish in seconds instead of waiting in a queue.
We never keep a copy. Once your NDJSON is delivered, both the original and the result are gone — there is nothing left to leak or misuse.
CSV vs NDJSON - Format Comparison
| Feature | CSV | NDJSON |
|---|---|---|
| File extension | .csv | .ndjson |
| Full name | Comma-Separated Values | Newline-Delimited JSON |
| Encoding | Text | Text |
| Editable | Yes | Yes |
| Open standard | Yes | Yes |
| Supported by PrivConvert | Yes (as input) | Yes (as output) |
| Privacy-safe conversion | In-memory, zero storage | |
| Max file size | 250 MB per file | |
| Batch support | Up to 20 files simultaneously | |
Trusted by thousands of users
Professionals reach for PrivConvert when the file they are converting is sensitive and cannot be left sitting on someone else’s server.