Built Because .env Files Break in Ways That Are Easy to Miss
A small set of free, browser-based tools for parsing, merging, and generating environment variable files. No install, no account, no server that ever sees your secrets.
Why this exists
A duplicate key or an unclosed quote in a .env file doesn't announce itself. It quietly changes your app's behavior, looks like an unrelated bug, and by the time you trace it back you've lost an afternoon.
We built these tools because that afternoon is avoidable, and because a good free option that didn't ask you to upload the file first didn't exist.
How your data is handled
A .env file is exactly the kind of thing you shouldn't paste into a random web form: API keys, database passwords, tokens that unlock production.
Every tool on this site runs entirely in your browser. Nothing you paste is transmitted, logged, or stored, because there's no server on the other end to receive it.
The Tools
.env Viewer
Parse and validate a .env file. Flags duplicate keys, syntax errors, and other issues before they reach your app.
.env Merger
Combine several .env files into one, with a picker for every key that conflicts. Built for migrations and onboarding.
.env Generator
Build a .env template from common variables for databases, auth, and third-party APIs, ready to fill in.
Why We Built This
A duplicate DATABASE_URL once cost half a day, buried on line 40 of a file nobody had scrolled past line 10 of. A .env file committed to a public repo by accident cost a weekend of rotating credentials. Both mistakes are avoidable, and both keep happening because checking a .env file by eye stops working past about ten lines.
Good tools for this were surprisingly hard to find. Most were:
- Server-based, which meant uploading credentials to someone else's infrastructure to check them
- Bundled into enterprise platforms, overkill for a quick syntax check
- Command-line only, requiring an install for a one-off task
- Abandoned, with dependencies years out of date
So this is the version we wanted: browser-based, free, and fast enough to reach for without thinking about it. No install, no account, nothing to upload.
Technical Details
Built With
- Next.js 15 - React framework with App Router
- TypeScript - Type-safe JavaScript
- Tailwind CSS - Utility-first CSS framework
- shadcn/ui - High-quality UI components
- Vercel - Hosting and deployment
Privacy Guarantees
- All processing happens client-side in your browser
- No data is ever transmitted to our servers
- No cookies for tracking purposes
- No analytics that capture your file contents
- Works offline once loaded