AI Image Upscaler
Enlarge and enhance your photos with AI-powered super-resolution. Choose 2× or 4× upscaling — processing runs 100% in your browser.
Drop an image here or browse
JPG, PNG, WebP · Max 2000px
100% Private — Your images are processed locally using AI and never leave your device.
100% secure
Your files are never shared
Ultra-fast
Processing in seconds
Privacy
Automatic deletion after 1h
How to upscale an image
Upload your image
Drag and drop or click to select a JPG, PNG, or WebP image. Images larger than 2000px will be automatically resized.
Choose your settings
Select the scale factor (2× or 4×), the AI model (Photo or Illustration), and your preferred output format and quality.
Download the result
Compare the original and upscaled versions using the interactive before/after slider, then download your enhanced image.
How does AI upscaling work?
Traditional image resizing uses mathematical interpolation (bilinear, bicubic) to guess pixel values between existing ones. This produces blurry results because no new detail is actually created.
AI upscaling uses a neural network (Real-ESRGAN) trained on millions of image pairs. The model has learned to predict fine details — textures, edges, facial features — that should exist at higher resolutions. The result is dramatically sharper and more natural than interpolation. Our tool runs this AI model entirely in your browser using ONNX Runtime with WebGPU acceleration.
When to use AI upscaling
- •Enhance old or low-resolution family photos for printing
- •Upscale product images for e-commerce listings
- •Improve screenshots and thumbnails for presentations
- •Enlarge artwork and illustrations for higher-resolution displays
- •Prepare low-res images for social media or marketing materials
Tips for best results
- •Start with the highest quality source image available — AI can enhance detail but can't invent information that was never there
- •Use the Photo model for real photographs and the Illustration model for anime, cartoons, and digital drawings
- •For most use cases, 2× upscaling provides the best quality-to-size ratio. Use 4× only when you really need maximum resolution
- •Choose PNG output for images with text, sharp edges, or transparency. Use JPG for photographs to keep file sizes manageable
- •If processing is slow, try a smaller input image or use a device with WebGPU support (Chrome or Edge on a modern GPU)
Your images stay private
This tool uses the Real-ESRGAN AI model running 100% locally in your browser via ONNX Runtime. Your images are never uploaded to any server — not even temporarily. All processing happens on your device.
The AI model (~5 MB) is downloaded once and cached in your browser's storage (IndexedDB). After that initial download, the tool even works offline. No account required, no data collection, no tracking.
AI Image Upscaler — Frequently asked questions
How does the AI upscaler work?
It uses Real-ESRGAN, a state-of-the-art neural network for image super-resolution. The model runs entirely in your browser using ONNX Runtime with WebGPU or WebAssembly acceleration — no images are uploaded to any server.
What's the difference between 2× and 4× upscaling?
2× doubles the width and height (4× total pixels). 4× quadruples both dimensions (16× total pixels). Both use the same AI model — 2× processes at 4× then downscales for optimal quality.
Which model should I choose — Photo or Illustration?
Choose 'Photo' for real-world photographs, portraits, and landscapes. Choose 'Illustration' for anime, cartoons, digital art, and drawings. Each model is specifically trained for its content type.
What's the maximum image size I can upscale?
Input images are limited to 2000px on the longest side. Larger images are automatically downscaled before processing. At 4× upscaling, this produces results up to 8000×8000 pixels.
Why is the processing slow on my device?
The AI model runs locally on your device. Speed depends on your hardware. Devices with WebGPU support (Chrome/Edge on modern GPUs) process much faster. Without GPU, it falls back to WebAssembly which is slower but still works.
Are my images safe?
Absolutely. All processing happens 100% in your browser. Your images never leave your device — not even temporarily. There are no server uploads, no storage, and no third-party access.
Does the AI model need to download every time?
No. The model (~5 MB) is downloaded once and cached in your browser's storage. Subsequent visits load instantly from cache.
What image formats are supported?
You can upload JPG, PNG, and WebP images. Output is available as either JPG (with adjustable quality 70–100%) or PNG (lossless).
Can I use this offline?
After the first visit (when the AI model is cached), the tool works offline or with a slow connection. All processing is done locally in your browser.
What is Real-ESRGAN?
Real-ESRGAN (Enhanced Super-Resolution Generative Adversarial Network) is a leading AI model for image upscaling developed by researchers at Tencent ARC Lab. It produces sharper, more detailed results than traditional interpolation methods like bicubic scaling.