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YAML to CSV Converter

Turn YAML files into CSV in a couple of clicks. YAML is an indentation-based config format that humans actually read; CSV is flat tabular text — one table, no formatting. The result is a best-effort reconstruction; check it before relying on it.

Not uploaded to any serverConverted on this deviceGone when you close the tabHow this works

Drop your files here

YAML files (.yaml, .yml) · up to 100 MB each

or paste files from your clipboard

Ready when you are

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

⌘K to search converters

How to use it

1
Add your YAML files
Drag them onto the drop area, choose them from your device, or paste them from your clipboard. You can queue several at once. Nothing is sent anywhere — the file stays on this device.
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.

Privacy, in plain words

Is it safe? Your YAML file is not uploaded anywhere

What “uploaded” normally means. On most online converters, pressing the button copies your file across the internet onto a computer owned by that website. That copy is what the word “upload” means, and it is the part nobody explains.

What happens instead. This site does not do it. There is no server here that receives files, so your YAML file is read, converted and handed back by the browser you are using right now. It never travels — so there is no copy to store, read, leak or hand over.

Check it yourself in ten seconds

Turn off your Wi-Fi after this page has loaded, then convert a file anyway. It still works, because everything needed is already on your device.

The longer explanation of how this works, and the full detail of what is and is not stored on the privacy page.

Why this matters more than it sounds

A CSV or JSON export is personal information in bulk — the format is boring, and what is in it usually is not. It matters more than it sounds, because of what data files usually are:

Contact exports

everyone you know, with their phone numbers

Transaction records

who paid what to whom, and when

Configuration files

these are where credentials get left by accident

Customer exports

every record your CRM holds, in one file

A file that is never sent cannot be kept, leaked, subpoenaed or used to train anything. That is a property of how this works, not a promise about how carefully it is run.

YAML and CSV explained

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

CSV is plain text where each line is a row and commas separate the fields. There is no formatting, no formulas, and no second sheet — which is precisely why every system on earth can read it.

Where YAML files come from: CI pipelines, Kubernetes manifests, Docker Compose and application config.
Where CSV is used: Database exports, analytics tools and data interchange between systems.

YAML vs CSV

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

YAML compared with CSV
Property	Source	Target
Compression	None	None
Introduced	2001	—
Browser support	Broad in DevOps tooling.	Every spreadsheet, database and programming language.

YAML is stronger at: Very readable for configuration. Supports comments, which JSON does not. Anchors let you avoid repetition.
CSV is stronger at: Readable by every spreadsheet, database and programming language. Plain text, so it diffs and streams well. Tiny files.

Why convert YAML to CSV?

People make this switch when they run into the limits of YAML: machine-to-machine data exchange, where JSON is less error-prone. CSV is the better fit when moving data between systems.

YAML limitations that prompt the switch: Indentation-sensitive, so whitespace errors are easy to make. Tabs are forbidden, which surprises people constantly. Unquoted values have surprising type coercion — the classic being 'no' becoming false.
What you give up: Exactly one table — no sheets, formatting or formulas. No type information, so leading zeros and long numbers get mangled.

What is preserved when converting YAML to CSV?

This is a reconstruction, not a copy. FileTools360 interprets the YAML file and rebuilds it as CSV, which works well for straightforward content and progressively less well as the original gets more complex. Check the output before relying on it — the caveat beside this converter says what specifically does not carry across.

CSV has no notion of data types. A product code like 007 becomes 7 unless the importing tool is told otherwise — which is a property of CSV, not a bug in the converter.

Measured, not estimated

What converting YAML to CSV actually costs

On every sample measured, the CSV came out smaller — 15% smaller at worst and 2.6× smaller at best.

The converter warns: Nested values in your file were flattened into dotted column names. Check the header row before using the file.

Each row is one sample chosen to isolate a property these formats treat differently.
Sample	YAML in	CSV out	Change
A plain tableTen rows of flat records — the shape almost every spreadsheet export actually has.	866 B	380 B	−56%
Many columnsForty columns across three rows. Column-heavy data is where per-cell overhead shows up.	2.5 KB	1.3 KB	−47%
Nested recordsObjects inside objects. This is the shape that cannot survive a flat format intact, and the one that triggers a warning.	791 B	301 B	−62%
Commas and quotation marksText fields containing the delimiter and the quote character — where an escaping bug would show.	1.0 KB	875 B	−15%

Produced by this site's own converter. The same code that runs in your browser, at the same default settings, so these are the bytes you would download.

Samples are generated from a fixed seed rather than taken from real photographs or documents, so the corpus is reproducible and carries no licensing question — and so the numbers predict the shape of your result rather than its exact size. Measured 2026-10-01. The method, and the command that regenerates every figure on this page, are on the how it works page.

About these formats

Source

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.

Target

Comma-Separated Values

Flat tabular text — one table, no formatting.

Extensions: .csv
MIME type: text/csv
Best for: Data imports and exports · Databases · Scripts
Compatibility: Every spreadsheet, database and programming language.

Nested structures are flattened into dotted column names (user.address.city). Deeply irregular data may produce a sparse table — check the result before relying on it.

Good to know

YAML to CSV Converter — questions

How do I convert YAML to CSV?

Drop your YAML file onto the area above, then press Convert. The CSV file saves straight to your device. You do not need an account, and there is no watermark.

Is it safe to convert YAML files here — are they uploaded to a server?

No, nothing is uploaded. On most online converters, pressing the button copies your file across the internet onto a computer owned by that website; it is converted there and sent back. That copy is what "upload" means, and it is the part that puts your file out of your control. This site does not do it. Your YAML file is read and converted by the browser you are using right now and never leaves this device, so there is no copy for anyone to store, read or hand over. You can prove it: turn off your Wi-Fi after this page loads and the conversion still works.

Can I convert confidential YAML files, like bank statements or contracts?

Yes, and that is the case this site was built for. Because the file never leaves your device, a confidential document is no more exposed than it is sitting in your own folder — there is no transfer, no copy on someone else's hardware, no retention period to read about and no staff with access. Nothing is logged about the file either: not its name, not its size, not its contents. The one thing worth saying plainly is that this protects the file in transit and at rest on our side, not from anything already on your own computer.

What should I know before converting YAML to CSV?

Nested structures are flattened into dotted column names (user.address.city). Deeply irregular data may produce a sparse table — check the result before relying on it.

What is preserved when converting to CSV?

The result is a reconstruction rather than a perfect copy. It is genuinely useful for reading and reuse, but review it before relying on it for anything important.

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. Pick the file through your phone's file picker — Files on iOS, or Downloads on Android — including files stored in iCloud or Google Drive.