Turn CSV files into TOML
This makes a TOML out of the CSV you already have. TOML is the usual choice for rust crate manifests in Cargo.toml. Your file never leaves your computer.
Need the other direction? Convert TOML to CSV
How to convert CSV to TOML
- 1 Drop your CSV .csv file onto the page, or click to browse for it.
- 2 Check the options. Nothing is thrown away on the way to TOML, so there is no quality dial to set.
- 3 Convert. The work happens on your own machine, so how long it takes depends on your computer and the file.
- 4 Download the TOML, or add more files and do the whole set in one go.
Why convert CSV to TOML
- Unambiguous rules, so two programs always agree on what it means.
- Dates and times are first-class values rather than strings.
- Python project metadata in pyproject.toml.
- CSV: only flat tables, so nested or repeated structures must be flattened.
CSV compared with TOML
How the two formats differ on the things that decide whether a conversion is worth making.
| Property | CSV | TOML |
|---|---|---|
| File extension | .csv | .toml |
| Colour depth | Delimited text, RFC 4180 quoting, encoding not declared in-file | UTF-8 key-value text with tables, arrays and native date types |
| Introduced | 1972 | 2013 |
| Developed by | IBM Fortran conventions, later RFC 4180 | Tom Preston-Werner |
Quality and what changes
Both sides are lossless, so every pixel survives the trip intact and converting back returns the same image. What changes is the size and what the file can carry: TOML stores the data without compression, so expect a much larger file.
- One TOML limitation to keep in mind: deeply nested settings get awkward and long-winded.
Questions about CSV to TOML
Can I open a TOML in a browser?
No. No mainstream browser renders TOML natively, so it will download rather than display. That is fine when the file is heading into desktop software or an archive, and a problem if it is going on a web page.
Is my CSV file uploaded anywhere?
No. The whole thing runs inside the browser tab you already have open. Your CSV is read straight from your own disk, converted on your machine and handed back as a TOML. Nothing is sent anywhere, nothing is stored and there is no account.
Is there a file size limit?
There is no server-side limit because no server sees the file. The real ceiling is your device memory, since the input and the output both have to fit in the tab. A few hundred megabytes is usually fine on a desktop machine and considerably less on a phone.
Can I convert several CSV files at once?
Yes. Add as many as you like and they are processed one after another, then offered as separate TOML downloads or as a single ZIP. Speed depends on your own processor rather than on a queue.
Does the converter work offline?
Yes, after the page has loaded once. The engine is cached by the browser, so you can disconnect, reload and keep converting. That falls out of doing the work locally rather than being a separate mode you switch on.