About Transmify

Transmify is a free, open-source tool for converting structured data between formats — JSON, CSV, XML, YAML, Excel, SQL, TOML, and more — directly in your browser.

Why it exists

Converting data between formats is one of those tasks developers, analysts, and anyone working with structured data run into constantly — turning an API response into a spreadsheet, a CSV export into JSON for a script, a database dump into something readable. Most tools that do this require uploading your data to a server, creating an account, or both. Transmify does neither: every conversion runs as JavaScript in your own browser tab, so the data never has to leave your device to get converted.

What it actually is

Three things, built around one shared conversion engine:

• A web converter — paste, upload, or drag a file, pick a format pair, get the result instantly.
• A free REST API — the same conversions, callable from your own code, no signup.
• A browser extension — extract tables from any webpage, or auto-format raw JSON API responses as you browse.

Open source, by design

The conversion engine, web app, API, and browser extension are all open source on GitHub. The core conversion engine itself has zero dependency on the DOM or Node.js — it's plain TypeScript, which means the exact same code that runs this website also runs unmodified on Cloudflare Workers, Node.js, Bun, Deno, Docker, or Kubernetes. If you want to run it yourself, or embed the engine in something else, nothing about it locks you into using this particular site.

Privacy, honestly

The web converter never transmits your input anywhere — conversion happens entirely client-side. The API and the browser extension work a little differently, since an API is inherently a server-side endpoint by definition. The privacy policy goes through each of the three exactly, including the parts that don't fit a simple "we never see your data" claim, rather than making a blanket promise that wouldn't hold up under scrutiny.

Who's behind it

Transmify is sponsored by Scriptimiz Insight LLP (scriptimiz.com), and maintained as an open-source project. The original product brief that shaped its scope is preserved as-written in the repository, if you're curious how it was originally scoped versus what actually got built.

Feedback

Bugs, feature requests, and general feedback are welcome via GitHub Issues. For support or privacy-specific questions, see the contact page.