About Metric Converter

What is Metric Converter?

Metric Converter is a free online tool for file format conversion and unit conversion. It currently publishes 93 file-conversion routes and 1132 selected unit-conversion pairs across 13 categories, all designed to run directly in your browser.

Core Principles

• Privacy First — File conversion runs locally in the browser using JavaScript, browser APIs, and WebAssembly where required.
• Defined Factors — Unit results use the conversion definitions recorded in the project’s unit registry, including exact factors where identified.
• 9 Languages — English, 中文, 日本語, Español, 한국어, Português, Français, Deutsch, Русский.
• Machine Readable — Static unit catalogs, llms.txt, and browser-local WebMCP integration are available. A public REST conversion API is not currently offered.
• Zero Cost — No registration and no paid feature gate. The site is supported by advertising.

The Story

Metric Converter was built in 10 days by a non-coder using AI agents — from zero to 3,900+ pages across 8 languages. It's proof that in the AI era, the bottleneck isn't coding ability, but product vision and taste. Read the full story →

Technology

Built with Astro, React, TypeScript, browser APIs, and selected JavaScript/WebAssembly libraries such as FFmpeg.wasm, pdf.js, and SheetJS. Hosted on Cloudflare Pages.

For Developers & AI Agents

• Unit Catalog — Static machine-readable unit definitions
• Category Catalog — Static machine-readable categories
• llms.txt — Structured info for large language models
• WebMCP — In-browser tool exposure for Chrome 146+ AI agents