Image Upscaler
Enlarge images 2x-4x online for free with Lanczos3 resampling and unsharp-mask sharpening - sharper than plain browser scaling, with PNG download and no upload.
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What is Image Upscaler?
The Image Upscaler enlarges images 2x, 3x or 4x in your browser using separable Lanczos3 resampling - the same high-quality kernel professional tools use - with optional unsharp-mask sharpening to restore edge definition after scaling. Results are previewed and exported as PNG with no upload.
Key Benefits
- Sharper enlargements than plain browser scaling
- Lanczos3 kernel preserves fine detail and edges
- Unsharp-mask sharpening to restore crispness
- Before and after sizes shown for every result
- Private and instant - everything runs in the browser
Common Use Cases
- •Enlarging small logos and icons for print mockups
- •Improving low-resolution screenshots for documentation
- •Preparing artwork for large-format displays
- •Restoring detail in old images before sharing
How to Upscale an Image
- Choose the image: Select the image file you want to enlarge from your device.
- Set the factor: Choose a 2x, 3x or 4x upscale and whether to apply unsharp-mask sharpening.
- Process and preview: Press Upscale image and wait while the Lanczos resampling runs.
- Download the PNG: Download the enlarged image as a PNG file at any time.
Key Features
- 2x, 3x and 4x enlargements with Lanczos3 resampling
- Unsharp-mask sharpening to restore edge definition
- Before and after sizes shown for every result
- Bounded working size keeps processing responsive
- PNG download of the enlarged image
- No AI service needed - fully client-side