AI Image Upscaler
4x AI-powered image upscaling using Real-ESRGAN.
Free, fast, and privacy-focused.
All processing happens in your browser. Your data never leaves your device.
Frequently Asked Questions
How does AI image upscaling work?
We use Real-ESRGAN, a state-of-the-art deep learning model that intelligently enhances image details. Unlike traditional upscaling which simply stretches pixels, Real-ESRGAN analyzes patterns and textures to generate new details, resulting in sharper, clearer images with minimal artifacts.
Is my data private and secure?
Absolutely! All processing happens entirely in your browser. Your images never leave your device — they're never uploaded to any server. The AI model downloads once to your browser and runs locally. This makes our tool completely private and secure.
What's the difference between 2x and 4x upscaling?
2x upscaling doubles width/height (4× pixels). 4x upscaling quadruples dimensions (16× pixels), providing maximum enhancement but taking longer.
What's the difference between "Fastest" and "Best" quality?
For 4x, Fastest uses a smaller model (17MB) that is quick with excellent results. Best uses a larger model (67MB) for maximum quality.
What image sizes are supported?
No strict limit. Desktop: up to ~2000×2000 comfortably. Mobile: under 1024×1024 recommended to avoid memory issues.
Why is it slow on my device?
AI upscaling is intensive and depends on your CPU/GPU and image size. We show estimates and optimize for your hardware.
Can I use this offline?
Yes. After the first model download, everything runs locally and can be used offline.
Does it work on mobile devices?
Yes, with limitations. We optimize settings for mobile and manage memory aggressively. Use smaller images for best results.
What image formats are supported?
Input: PNG, JPEG, WebP, GIF, etc. Output: PNG, JPEG, WebP, AVIF.
How do I compare the original and upscaled images?
Use the toolbar modes: View, Inspect, Compare, Split, Crop.
What happens if processing is interrupted?
Progress is saved. Reload and click Resume to continue where you left off.
Can I process multiple images?
One image at a time for performance. Upload a new image anytime to restart.
Why do I see "Improve patch edges" option?
Enables overlap and feathering between patches to prevent seams.
Is this really free? What's the catch?
Yes, completely free with no limits, ads, or watermarks. Everything runs locally.
How does this compare to other tools?
100% in-browser: no uploads, no queues, no privacy concerns. Speed depends on your device.