AI Image Upscaler
Upscale images up to 4x with AI โ 100% free, no sign-up required. Powered by Swin2SR running entirely in your browser. Enhance low-resolution photos, sharpen details, and restore old images with state-of-the-art AI super-resolution.
Drop an image here or click to browse
Supports: JPG, PNG, WebP ยท Max: 10MB ยท Best results with images under 1024px
Frequently Asked Questions
Is this tool really free?
Yes! Completely free with no sign-up required. No credits, no watermarks, no limits. The AI model runs entirely in your browser, so there are no server costs.
How does it work?
This tool uses the Swin2SR (Swin Transformer for Image Super-Resolution) model running locally in your browser via Transformers.js. The model was trained to reconstruct high-resolution details from low-resolution inputs, delivering 4x upscaling quality that surpasses traditional interpolation methods.
Is my image uploaded to a server?
No! Your image is processed entirely in your browser. It never gets uploaded to any server. This ensures complete privacy — you can even use this tool offline after the model is cached.
Why is the first load slow?
The first time you use this tool, your browser downloads the AI model (~34MB). This only happens once — the model is cached by your browser, so subsequent uses load instantly. The download speed depends on your internet connection.
What image sizes work best?
For best results, use images between 256ร256 and 1024ร1024 pixels. Very large images may take longer to process or require more memory. The model outputs a 4x upscaled version (a 512ร512 image becomes 2048ร2048).
What's the difference between AI upscaling and normal resizing?
Normal resizing (bilinear/bicubic interpolation) just stretches pixels — results are blurry. AI super-resolution reconstructs realistic details (texture, edges, patterns) that weren't in the original. It's like restoring an HD version from an SD source.
Can I use it on my phone?
Yes! This tool works on modern mobile browsers. However, processing may be slower on mobile devices due to limited computational resources. For best results, use a desktop browser.