DEV3 Free Image Resizer and Cropper — Source Code (React + Tailwind)

Source code of the DEV3 Image Resizer and Cropper, a canvas-based image editor with a draggable crop box, preset ratios, exact output sizes, rotate and flip, and PNG, JPG or WebP export.

Free download: sign in to any DEV3 account and click Download ZIP. Try it live: https://dev3.tech/tools/image-resizer-cropper 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

• Pointer-driven crop box with ratio-locked corner handles
• Linked width and height with percent and size presets
• Rotate and flip applied before cropping
• Step-down resampling for sharp downsizes

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.