Free PNG Upscaler

Upscale PNG. Stay Sharp.

Enlarge PNG images 2x, 3x, or 4x with premium algorithms - Lanczos for photos, Pixel-Perfect for pixel art. Transparency preserved. No signup, completely free.

4x max scale
4 algorithms
100% free forever

Drop your PNG file here

or click to select a file from your computer

Single PNG file  |  max 20 MB  |  transparency preserved

What is PNG Upscaling?

PNG upscaling increases the pixel dimensions of an image by a chosen scale factor - 2x, 3x, or 4x. It is useful when you need a larger version of a graphic for print, high-DPI screens, video backgrounds, or presentation slides. Unlike simple browser stretching, server-side upscaling applies a mathematical resampling filter that minimizes blurring and jagged edges.

Our tool supports four algorithms tailored to different image types: Lanczos for smooth, natural-looking photos; Mitchell for balanced general-purpose upscaling; CatRom for crisp logos and UI elements; and Pixel-Perfect (nearest-neighbor) for pixel art that must keep its hard edges. All transparent PNG images are handled with full alpha channel preservation.

Which Algorithm Should I Use?

Lanczos - the gold standard for photo and illustration upscaling. It applies a windowed sinc function that minimizes ringing and blurring while preserving fine detail. Use this for portraits, landscapes, and complex textures.

Mitchell - a good middle ground between sharpness and smoothness. Works well for mixed-content images like screenshots, product images, and infographics.

CatRom - a Catmull-Rom cubic filter that produces noticeably sharper edges. Ideal for logos, icons, UI screenshots, and any graphic where clean lines matter more than softness.

Pixel-Perfect - nearest-neighbor resampling that copies pixels exactly without blending. The only correct choice for pixel art, retro sprites, or any image where you want each pixel to remain solid and unblurred.

How to Upscale a PNG Online - Step by Step

  1. Drop your PNG file onto the upload area above or click "Browse Files" to select it. The tool accepts any PNG up to 20 MB.
  2. Choose your scale factor: 2x doubles dimensions, 3x triples them, and 4x quadruples them. A live preview shows the expected output dimensions.
  3. Select the upscaling algorithm that matches your image type. For most images, Lanczos is the safest default. For pixel art, always choose Pixel-Perfect.
  4. Click "Upscale PNG" and download the result. Transparency is preserved - your upscaled image remains a fully valid PNG.

Privacy & Security

Your uploaded file is processed securely on our server and automatically deleted after download. We never store, share, or analyze your images. No account, no email, no registration - just upload and upscale.

All processing happens server-side with ImageMagick, a battle-tested open-source image processing library trusted by millions of developers worldwide.

Frequently Asked Questions

For photos, Lanczos is the best choice - it produces smooth, high-quality results with minimal artifacts. For balanced sharpness, try Mitchell. CatRom is ideal when you need crisp, well-defined edges. For pixel art, always use Pixel-Perfect (nearest-neighbor) to keep hard edges sharp.

Upscaling increases pixel dimensions, which means some interpolation is always applied. Our high-quality algorithms (Lanczos, Mitchell, CatRom) minimize visible artifacts and produce smooth results. For pixel art, Pixel-Perfect mode preserves the original hard edges exactly without any blending.

Yes. All alpha transparency is fully preserved during upscaling. Logos, icons, and graphics with transparent backgrounds are handled perfectly at any scale factor. The output is always a valid PNG with full alpha channel support.

The output image is capped at 8000x8000 pixels to protect server performance. If your chosen scale factor would result in a larger image, the tool will notify you and apply the maximum safe dimensions. For most use cases - icons, web graphics, and photos under 2000px - 4x upscaling works without hitting any limits.

Choose 3x or 4x scale with the Lanczos algorithm for the smoothest print-ready result. If you need a specific DPI, upscale first and then adjust the DPI in a dedicated image editor like GIMP or Photoshop. For logos and flat graphics, CatRom keeps lines crisp and professional.