DEV3 Free Image Format Converter — Source Code (React + Tailwind)

Source code of the DEV3 Image Format Converter, converts batches of images between PNG, JPG, WebP and AVIF in the browser and detects honestly whether the browser can encode AVIF.

Free download: sign in to any DEV3 account and click Download ZIP. Try it live: https://dev3.tech/tools/image-format-converter shows the finished tool running.

What is in the download

• A standalone Vite + React + TypeScript + Tailwind CSS project: src/tool holds the tool, shared pieces sit beside it
• package.json with exact versions plus a lockfile, so npm ci works
• README.md (run, build, embed in Next.js or plain React) and an MIT LICENSE

What the code does

• PNG, JPG, WebP and AVIF output with a quality slider
• Runtime AVIF encode detection with an explanatory message
• Background fill for transparent sources saved as JPG
• Zip download of the whole batch

Tech stack

React 19, TypeScript, Vite, Tailwind CSS 4, jszip.

Install and customise

The How to install and How to use tabs list the steps. In short: unzip, npm ci, npm run dev, then copy the tool folder into your own app if you want to embed it.

Good to know

• A browser-only tool: there is no backend or database in the code.
• Animated GIFs convert to a still image of the first frame.