TOML Converter
FileFlip converts TOML files into 5 other formats entirely inside your browser, using the text engine compiled to WebAssembly. The TOML file is never uploaded to a server: it is read off your disk, converted on your own machine, and saved back by the browser. There is no file-size limit and no account to create.
How do I convert a TOML file?#
- Drop your TOML file onto the converter at the top of this page, or click it to pick one from your computer.
- Choose the format you want out of it. FileFlip downloads the engine that conversion needs, once, and your browser caches it.
- Conversion starts the moment you pick the format, and the result is yours to download. The work happens in this tab, so nothing is uploaded and nothing is queued.
Is it safe to convert TOML files online?#
Yes, because nothing is uploaded. FileFlip converts TOML files inside the browser tab you already have open, using WebAssembly builds of the same engines a desktop converter would install. Your file is read from your own disk into the page's memory, and no request carrying it is ever made.
You do not have to take that on trust. Open your browser's network panel, run a conversion, and you will see the engine come down and your file go nowhere. There is no upload, no server-side copy, no retention window, and no account tied to what you converted.
How FileFlip works lists every engine, its version and its download size, and shows how to check for yourself that nothing leaves your machine.
What happens to a TOML file#
FileFlip converts TOML into 5 formats with the text engine, all of it inside the browser tab. Each conversion below names the engine it uses, what it downloads, and exactly what that conversion keeps or drops.
| Category | Data Files |
|---|---|
| File extension | .toml |
| FileFlip support | Read and written |
| Conversions available | 5 |
| Engines | the text engine |
| Downloaded to your browser | Nothing. Your browser already has everything these conversions need |
What is a TOML file?#
A TOML file holds configuration as key-value pairs grouped into tables, with native types for strings, integers, floats, booleans, arrays and dates.
Pick TOML for configuration files a person writes and re-reads by hand, where explicit types and unambiguous structure matter more than deep nesting.
Convert TOML to JSON or YAML when the data needs to nest more than a couple of levels deep, or when the tool consuming it doesn't have a TOML parser.
The TOML file format reference covers the specification, the programs that open one, and what each conversion keeps or drops.
TOML questions people ask#
Why can't I convert a TOML file to a JSON array?
A TOML document always starts as a table of key-value pairs, so a file that only needs to model a top-level list, like a plain array of strings, doesn't fit TOML's grammar at all. Converting a JSON array to TOML has to wrap the array under a key, like items = [...], because TOML has no bare top-level list.
Does TOML support comments?
Yes. TOML comments start with a hash character and run to the end of the line, the same as YAML and Python. That's one of the reasons TOML was picked for Cargo.toml and pyproject.toml over JSON, which has no comment syntax at all.
What happens to TOML's dates when converting to JSON?
TOML has a native date-time type with its own syntax, and JSON has none, so converting to JSON turns every TOML date into a plain string. Which string format it becomes depends on the converter, since JSON doesn't specify one either.