ConvertFast

Free browser-based file conversion tools. No upload, no server, no signup.

How it works

Every converter runs 100% client-side in the user's browser using Canvas API, FileReader, and Blob. Files never leave the device.

Converters

Image

• PNG → WebP
• JPG → PNG
• PNG → JPG
• WebP → PNG
• SVG → PNG
• Image Resizer

Data

• JSON Formatter & Validator
• YAML → JSON
• JSON → YAML
• Base64 Encoder/Decoder

Development

npm run dev    # Start dev server on http://localhost:3001
npm run build  # Build to dist/

Stack

• Vanilla HTML/CSS/JS (no frameworks)
• Static site (GitHub Pages / Cloudflare Pages)
• $0 hosting cost