I built an AI Image Upscaler that runs 100% in the browser (no server uploads)

Dev.to / 4/8/2026

📰 NewsDeveloper Stack & InfrastructureTools & Practical Usage

Key Points

  • The author launched a lightweight AI image upscaler that performs processing entirely in the browser, so uploaded images never leave the user’s device.
  • The tool can upscale photos, anime, and digital art up to 4K resolution and offers free daily uses without requiring sign-up or adding watermarks to free outputs.
  • It uses a web-based AI runtime stack (TensorFlow.js and ONNX Runtime Web) with optimized upscaling models aimed at keeping the experience fast and lightweight.
  • The implementation is built with Astro, TypeScript, and Preact, targeting a clean, low-bloat user interface and quick performance.
  • Users can access the service at imgupscaleai.com and are invited to provide feedback and feature requests.

I’ve been building AI tools for the web, and I just launched a lightweight AI image upscaler that works entirely in your browser.

The main goal was simple: privacy + speed + no bloat.

✨ Key Features

  • 100% local in-browser processing (your images never leave your device)
  • Upscale photos, anime, and digital art up to 4K resolution
  • No sign-up required, no watermarks on free outputs
  • 3 free daily uses for everyone
  • Clean, fast UI with zero unnecessary bloat

🛠️ Tech Stack

  • Frontend: Astro + TypeScript + Preact
  • AI Runtime: TensorFlow.js / ONNX Runtime Web
  • Models: Optimized real-world AI upscaling models for web performance

If you’re into AI on the web, browser-side machine learning, or just need a private, no-fuss tool to enhance your photos, give it a try. I’d love to hear your feedback and feature requests!

🔗 Try it here: https://imgupscaleai.com