How do I convert JSON to YAML?

Add your JSON file to the upload area above, then press Convert. The YAML file downloads straight to your device. You do not need an account, and there is no watermark.

Are my files uploaded to a server?

No. This conversion runs entirely inside your browser using WebAssembly, so the file never leaves your device — you can even disconnect from the internet after the page loads and it will still work.

Does converting to YAML reduce quality?

No. YAML is a lossless format, so the conversion preserves exactly what is in your JSON file. Note that it cannot recover detail that was already discarded when the JSON was first created — a lossless container does not undo earlier compression.

How large a file can I convert?

Up to 100 MB per file for this conversion. Because the work happens in your browser, the practical limit is your device's memory — larger files work on a desktop with plenty of RAM and may fail on an older phone.

Can I convert several files at once?

Yes. Add as many as you like and press Convert All. Each file is processed independently, so one failure does not stop the rest, and you can download everything together as a ZIP.

Can I use this on my phone?

Yes. FileTools360 works in mobile browsers on iOS and Android, including choosing files straight from your camera roll. Very large videos may run out of memory on a phone — those are better converted on a laptop.

DataLosslessRuns in your browser

JSON to YAML Converter

Turn JSON files into YAML in a couple of clicks. The default data interchange format for APIs. Indentation-based config format that humans actually read. The conversion is lossless — every pixel, sample or byte in the source is preserved.

On your deviceNever uploadedGone when you close the tabHow this works

Drop your files here

JSON files (.json) · up to 100 MB each

or paste files from your clipboard

Ready when you are

Drop a JSON file above and FileTools360 will turn it into YAML — right here on your device, without uploading anything.

⌘K to search converters

How to use it

1
Add your JSON files
Drag them onto the upload area, choose them from your device, or paste them from your clipboard. You can queue several at once.
2
Adjust the settings if you want to
The defaults suit most people. Open Advanced to control indentation and element names.
3
Convert and download
Press Convert. Everything happens on your own device — nothing is uploaded. Download files one by one, or grab them all as a ZIP.

JSON and YAML explained

JSON represents structured data as nested objects and arrays. It came from JavaScript but is now the default interchange format for essentially every web API.

YAML expresses structured data through indentation rather than brackets, which makes configuration files far easier to read. It is a superset of JSON.

Where JSON files come from: APIs, configuration files and application data exports.
Where YAML is used: CI pipelines, Kubernetes manifests, Docker Compose and application config.

JSON vs YAML

The two formats solve different problems, which is why converting between them involves trade-offs rather than a straight upgrade.

JSON compared with YAML
Property	Source	Target
Compression	None	None
Introduced	2001	2001
Browser support	Every modern language and tool.	Broad in DevOps tooling.

JSON is stronger at: Native support in every modern language. Handles arbitrary nesting. Distinguishes strings, numbers, booleans and null.
YAML is stronger at: Very readable for configuration. Supports comments, which JSON does not. Anchors let you avoid repetition.

Why convert JSON to YAML?

People make this switch when they run into the limits of JSON: large flat tables, where CSV is smaller and simpler. YAML is the better fit when configuration files a human will read and edit.

JSON limitations that prompt the switch: No comments allowed. Verbose for large tabular datasets. No date type, so dates are strings by convention.
What you give up: Indentation-sensitive, so whitespace errors are easy to make. Tabs are forbidden, which surprises people constantly.

What is preserved when converting JSON to YAML?

Both formats store the content without discarding data, so this conversion preserves it exactly. The file size may change because the two formats compress differently, but the content itself is unaffected.

About these formats

Source

JavaScript Object Notation

The default data interchange format for APIs.

Extensions: .json
MIME type: application/json
Best for: APIs · Configuration · Structured records
Compatibility: Every modern language and tool.

Target

YAML Ain't Markup Language

Indentation-based config format that humans actually read.

Extensions: .yaml, .yml
MIME type: application/yaml
Best for: CI pipelines · Kubernetes · App configuration
Compatibility: Broad in DevOps tooling.

Good to know