File Converter

NDJSON to YAML converter Free, private, no upload.

Convert NDJSON files to YAML right in your browser. YAML is easy to read and edit by hand, which is why it is the standard for configuration files. Your files are never uploaded.

or drop files anywhere · paste with Ctrl/⌘ + V

How to convert NDJSON to YAML

  1. 1 Drop your NDJSON files onto the page, or click “Choose files”. You can add many at once, or a whole folder.
  2. 2 YAML is already selected as the output. Optionally open Options to adjust indent, sort keys.
  3. 3 Click Convert, then Save. Converting several files? Save them all as one ZIP.

About the formats

NDJSON · Newline-delimited JSON

NDJSON (also called JSON Lines) stores one JSON object per line. It is used for logs, data pipelines and bulk imports.

YAML · YAML

YAML is a human-friendly data format used for configuration in Docker Compose, Kubernetes, GitHub Actions and more.

The conversion runs on your device using proper parsers for each format (yaml, smol-toml, fast-xml-parser and PapaParse). You can adjust: indent, sort keys.

Frequently asked questions

How do I convert NDJSON to YAML?

Drop your NDJSON files onto the page, or click “Choose files”. You can add many at once, or a whole folder. YAML is already selected as the output. Optionally open Options to adjust indent, sort keys. Click Convert, then Save. Converting several files? Save them all as one ZIP.

Are my files uploaded to a server?

No. The conversion runs entirely in your browser using WebAssembly. Your files never leave your device, so it is safe for private photos, contracts and business data. Once the page has loaded it even works offline.

Will converting NDJSON to YAML reduce quality?

No. NDJSON to YAML conversion is exact: the data is parsed and rewritten, not approximated.

Can I convert multiple NDJSON files to YAML at once?

Yes. Add as many NDJSON files as you like; they are converted in parallel on your device and you can download them all as a single ZIP.

Is it free? Are there limits?

It is free, with no sign-up, no watermark and no daily limits. Because nothing is uploaded there is no upload size limit either; the only limit is your device’s memory, which matters mostly for very large videos.

See everything the NDJSON converter and the YAML converter can do.