How does the AI image upscaler work?

Upscale Local uses RealESRGAN (Real-Enhanced Super-Resolution Generative Adversarial Network) AI model running via ONNX Runtime in your browser. It analyzes pixel patterns to intelligently fill in detail, producing sharp, high-resolution results.

Is my image data private?

Absolutely. Your images never leave your device. All AI processing happens locally in your web browser. No images are uploaded to any server.

What is the maximum upscale factor?

You can upscale images by 2x, 3x, 4x, or even 8x. The AI model natively runs at 4x, so for other scales the result is further resized using high-quality interpolation.

Does it work on mobile?

Yes. On mobile devices, a lighter SRCNN model is used for faster processing. Desktop uses the full RealESRGAN-x4 model for maximum quality.

AI Upscaler

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Elevate Your Images
AI Image Upscaler

100% Free forever! Elevate your images with state-of-the-art AI upscaling.

Select Image File

Drag & drop, click to browse, or paste from clipboard

PNGJPGWEBPGIFBMPMax 50MB

Select Image File

Ctrl+V Paste

Completely Free

No hidden costs, watermarks, or paid plans.

Browser Processing

Files never leave your device. Complete privacy.

AI-Powered Upscaling

RealESRGAN AI enhances quality up to 8x.

How to Upscale Your Images for Free

Three simple steps to enhance any photo using AI — no account, no watermark, no upload to servers.

Upload Your Image

Drag & drop or click to select any PNG, JPG, or WebP image. Works with photos, illustrations, screenshots, and more.

Choose AI Scale

Pick 2x, 3x, 4x, or 8x upscaling. The RealESRGAN AI model runs entirely in your browser — your images stay private.

Download Free

Compare before & after, then download your enhanced high-resolution image. No watermark. No sign-up. Always free.

Frequently Asked Questions

Everything you need to know about AI image upscaling.

Is this AI image upscaler really free?+

Yes — 100% free, forever. No watermarks, no usage limits, no sign-up required. The AI model runs directly in your web browser, so there are zero server processing costs.

How does the AI upscaling work?+

Upscale Local uses RealESRGAN (Real-Enhanced Super-Resolution GAN), a state-of-the-art AI model. It analyzes your image tile-by-tile, intelligently reconstructing fine details, textures, and edges to produce a sharp, high-resolution result.

What is the difference between AI upscaling and regular resizing?+

Regular resizing (like Lanczos or bilinear interpolation) simply stretches pixels, often resulting in blurry or blocky output. AI upscaling with RealESRGAN hallucinated new detail based on learned patterns, producing significantly sharper and more natural-looking results.

Are my images private and secure?+

Absolutely. Your images never leave your device. All AI processing happens entirely in your browser using WebGL/WASM. No image data is ever uploaded to any server.

What image formats are supported?+

You can upload PNG, JPG/JPEG, WebP, GIF, and BMP images. You can download results as PNG (lossless), JPEG (smaller size), or WebP (best balance).

Can I upscale images on my phone?+

Yes! On mobile devices, a lighter SRCNN model is automatically used for faster processing. Desktop users benefit from the full RealESRGAN-x4 model for maximum quality output.

Why Choose Upscale Local?

Unlike other image upscalers that require uploading your photos to a cloud server, Upscale Local processes everything locally in your browser. Your images stay on your device, making it the most privacy-friendly AI upscaler available online.

🔒 100% Private⚡ No Sign-up✨ No Watermark♾️ Unlimited Free🤖 RealESRGAN AI📱 Mobile Friendly

Free AI Image Upscaler — Enlarge Photos to 4K without Quality Loss

Enlarge any image using state-of-the-art AI Super Resolution technology. Upscale Local detects contours and textures in blurry photos or low-res raster art, reconstructing sharp details and increasing resolution up to 4x.

Your images are processed 100% locally in your web browser through WebAssembly, meaning no photos are uploaded to external servers. Experience offline AI computation that respects your privacy.

Frequently Asked Questions (FAQ)

How does AI upscaling prevent images from pixelating?

Our AI model (Real-ESRGAN) is trained on millions of high-definition images to mathematically fill in lost pixels, reconstructing realistic details and sharp lines instead of just stretching the canvas.

Are there any file upload limits?

There is no server-side upload limit because processing is local. We support files up to 100MB and resolutions up to 16,384px depending on your device's memory.

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Frequently Asked Questions

Why Choose Upscale Local?

Free AI Image Upscaler — Enlarge Photos to 4K without Quality Loss

Frequently Asked Questions (FAQ)

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