Upscale Image Online

Increase resolution up to 4x with Lanczos3 technology. 100% Free.

✨ Higher Resolution
📐 Lanczos3 Algorithm
🔒 100% Private
⚡ Instant
📱 No App Needed

How It Works

Upscale in 3 Steps

Our intelligent process makes it easier than ever.

Upload Image

Select your photo. We support JPG, PNG, and WebP.

Select Scale

Choose between 2x or 4x scale factor.

Upscale & Download

Our engine processes the image instantly.

Technology

Why Our Resizer?

We use advanced algorithms instead of simple stretching.

Regular Resizing

Pixelated edges
Loss of sharpness
Visible artifacts

DuneTools (Lanczos3)

Smart Interpolation
Sharp edges
Detail preservation

🔐

100% Secure

Processing is done in your browser via WebAssembly. Your photos never leave your device.

🏎️

GPU Accelerated

We use your device's power to process images much faster than a standard server.

✨

Professional Quality

The Lanczos3 algorithm is the industry standard for high-quality resizing.

❓ FAQ

Frequently Asked Questions

Upscaling is the process of increasing image resolution while maintaining the highest possible quality. Our Lanczos3 algorithm intelligently interpolates pixels to create details that didn't exist in the original image.

2x doubles the dimensions (an 800x600 image becomes 1600x1200). 4x quadruples them (800x600 becomes 3200x2400). Higher scale = more processing time but better result for large prints.

Lanczos3 is considered the professional standard for image scaling. It produces sharper edges and fewer artifacts than simple algorithms like bilinear or bicubic, preserving details and textures.

Absolutely. All processing happens locally in your browser. Your images NEVER are uploaded to any server. It is 100% private.

You can process up to 100 images at once, with no daily limit. The only limit is your device's memory.