YAML to .env Converter
YAML → .env. Nested mappings flatten to SCREAMING_SNAKE_CASE with your separator, and values containing spaces, quotes, # or newlines are quoted.
YAML to .env Converter — Free Online Tool
Converts a YAML configuration file into .env format, flattening nested mappings into SCREAMING_SNAKE_CASE variables with a configurable separator, serializing sequences as compact JSON or a delimited string, and quoting values containing spaces, newlines or a hash, useful for turning a Helm values file or docker-compose environment block into a local .env.
How to use the YAML to .env Converter
- Open the tool above — it runs entirely in your browser, so your input never leaves this page.
- Paste or type your input into the field, then press the relevant button (e.g. Encode / Decode, Generate, or Convert).
- Copy the result from the output area with the copy button orCtrl/Cmd + C.
- No signup, no upload, and no tracking — repeat as often as you need.
Frequently asked questions
Which separator should I use?
Match the consumer. ASP.NET Core and Spring read DB__HOST with a double underscore; many Node config libraries use the same. A single underscore is ambiguous whenever a key already contains one.
How are YAML sequences handled?
There is no standard flat encoding for a list, so you choose: a comma-joined string (what most config binders expect) or compact JSON (which round-trips exactly, including nested objects).
Can I convert a Helm values.yaml with this?
Yes — that is the common case. The nested values become prefixed variables you can source locally, which is a quick way to run a chart's service outside Kubernetes.
Free & private — why use this YAML to .env Converter
The YAML to .env Converter runs 100% client-side in your browser. Your data is never uploaded to a server, no account is required, and the tool is completely free. It works offline once the page has loaded and is part of a growing collection of privacy-first developer utilities.