# Image Upscaler

Enlarge an image two, three or four times with high-quality Lanczos resampling. The tool multiplies the width and height by the factor you pick and interpolates new pixels smoothly, which keeps edges crisp and avoids blocky steps. Use it to prepare small logos, icons, screenshots and old photos for larger layouts. Results may be up to 4000 pixels on each side.

## Frequently asked questions

### How does the upscaler enlarge my image?

It multiplies the width and height by 2, 3 or 4 and calculates the new pixels with the Lanczos3 filter, which weighs a neighborhood of original pixels for smooth gradients and sharp edges. The proportions stay exactly the same.

### What is the largest result I can get?

The enlarged image may be up to 4000 pixels on each side. A 1000 by 800 image can be upscaled 4 times to 4000 by 3200, while a 1500 pixel wide image can be doubled but not tripled. Larger requests are refused with a clear message.

### Does upscaling add real detail?

No. Lanczos resampling interpolates between existing pixels, so it makes images larger and smoother without inventing new detail. It does not use AI, which keeps the result faithful to the original.

### Which factor should I choose?

Use 2x for a moderate enlargement with the least softness. Choose 3x or 4x for small icons, pixel-sized logos or thumbnails that need to fill a much larger space.

### Is transparency preserved?

Yes. Transparent and semi-transparent areas are scaled along with the colors, and the result is saved as a PNG with its alpha channel.

### Why does my upscaled image look soft?

Enlarging spreads the same information over more pixels, so fine detail looks softer. Running the result through the Image Sharpen tool with a small sigma can restore some crispness.

### Can I upscale pixel art without blur?

Lanczos smooths pixel art. For crisp square pixels, use the Image Affine Transform tool with a=2 and d=2 or higher and nearest neighbor interpolation.

### Which file formats can I upload?

You can upload JPEG, PNG, GIF, WebP, TIFF and AVIF images up to 5 MB. Animated files are enlarged using their first frame, and the result is a PNG.

### Why is the output file so large?

A 4x upscale has 16 times as many pixels, and the result is a lossless PNG. Compress or convert it afterward with the Image Compressor or Image Converter tool if you need a smaller file.

### Can I choose an exact size instead of a factor?

Yes, with the Image Resize tool, which accepts a width and height of up to 4000 pixels and several fit modes. The upscaler is the quicker choice when you simply want two, three or four times the size.

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