Free TOML ↔ JSON converter
Config file conversion for modern stacks — nothing uploaded.
How to use this tool
- 1
Open TOML converter
Use it for this task: TOML <-> JSON conversion, direction toggle, pretty-print output - 100% in-browser.
- 2
Paste or upload the source content
Put the original text or file in the input area, then choose the conversion or formatting options.
- 3
Copy or download the converted result
Check the preview first, then copy the output or download the generated file.
Quick facts
| Runs offline? | Yes — after load, processing stays in your browser. |
|---|---|
| Uploads data? | No. Your input is not sent to our servers. |
| Account required? | No signup or login. |
| Locales? | UI in 7 languages; tool logic is locale-agnostic. |
Top use cases
- TOML <-> JSON conversion, direction toggle, pretty-print output - 100% in-browser.
- Runs offline?: Yes — after load, processing stays in your browser.
- Uploads data?: No. Your input is not sent to our servers.
- Account required?: No signup or login.
- Locales?: UI in 7 languages; tool logic is locale-agnostic.
FAQ
Does my data leave this device?▾
No. This tool runs in your browser tab; we do not receive your input.
How is this different from desktop software?▾
No install — open and use. Best for quick, small jobs.
How large can inputs be?▾
Limited by device memory. Very large inputs may be slow — split batches if needed.
Mobile browsers?▾
Modern mobile browsers work; heavy jobs are smoother on desktop.
How accurate are results?▾
We use standard Web APIs; verify critical outputs yourself.
How to report issues?▾
Use the Contact link in the site footer.