DEV3 Free Image Watermark Tool — Source Code (React + Tailwind)

Source code of the DEV3 Image Watermark Tool, adds text or logo watermarks to batches of images with nine-point positioning, tiling, rotation and opacity, then zips the results.

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

• Text (with outline) or logo marks sized relative to the image
• Single or tiled staggered layouts at any angle
• Per-image preview with thumbnails
• Original format preserved on export

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.