Linux & System Administration Tools

Environment Variable Formatter

Clean up and normalize a list of KEY=value environment variable definitions - handles whitespace, comments, quoting, and duplicates.

Paste your KEY=value lines below - this tool trims stray whitespace, flags duplicate keys, and normalizes quoting, without ever transmitting the values anywhere.

Environment Variables (KEY=value)

Everything you paste stays in your browser - nothing is sent to or stored on our servers.

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For checking values specifically against a Docker Compose file's expectations (missing values, unresolved ${VAR} references), see the Docker Compose Environment Validator.

What Does This Tool Do?

It reformats a list of KEY=value lines (like the contents of a .env file) - trimming inconsistent whitespace around the =, normalizing quote usage, and flagging keys that are defined more than once.

Why Use This Tool?

.env files accumulate small inconsistencies over time (extra spaces, mixed quoting styles, a variable defined twice after a merge) that don't cause errors but make the file harder to read and maintain. This tool cleans that up in one pass.

How to Use It

Paste your environment variable lines.
Click Format.
Review the cleaned-up output and any duplicate-key warnings, then copy it back into your .env file.

Important Notes

Everything you paste here stays in your browser - values are never sent to or stored on any server. Comments (lines starting with #) are preserved as-is.

Frequently Asked Questions

It trims whitespace around keys and values, normalises quotes (adding double quotes only where a value contains spaces) and keeps comment lines, producing a tidy KEY=value list.

When they contain spaces, # characters or other special characters. Quoting rules differ slightly between shells, Docker and dotenv libraries.

Both lines are kept and a warning shows where the key is repeated, because most loaders simply use the last value, which can hide mistakes.