Convifi (earlier ConvertFast)

A free, browser-based file converter. Converts video, audio, images, and documents locally using WebAssembly — no file upload, no server, no account required.

Built with TanStack Start, wasm-vips, FFmpeg.wasm, and Pandoc.wasm. All 148+ conversion routes are statically prerendered at build time for fast load and full SEO.

Live: convifi.com · Source: github.com/techlism/convifi

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Development

npm install
npm run dev

Production build

npm run build
node .output/server/index.mjs

The build prerenenders all pages (converters, blog, tools) to static HTML. Output goes to .output/.

Deployment

The build output is a self-contained Nitro server. Deploy the .output/ directory to any Node-compatible host (Render, Fly.io, Railway, your own VPS) and run the server command above.

For platform-specific presets (Vercel, Netlify, Cloudflare, AWS Lambda):

# example: Cloudflare Pages
NITRO_PRESET=cloudflare-pages npm run build

See nitro.build/deploy for all available presets.

Linting & formatting

npm run lint
npm run format
npm run check

Uses Biome.

Adding UI components

npx shadcn@latest add <component>

Routing

File-based routing via TanStack Router. Routes live in src/routes/ using folder-based convention — each route is a folder with an index.tsx inside.

Dynamic routes: /convert/$format and /blog/$slug. Both are prerendered at build time from lib/conversion-formats.ts and lib/blog-posts.ts respectively via vite.config.ts.

routeTree.gen.ts is auto-generated — do not edit it manually. It regenerates on dev server start.