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Image Upscaler Online Free — PrivaTools

Upscale images online for free — enlarge photos 2x or 4x using high-quality Lanczos resampling. Supports JPG, PNG, and WebP. Improve resolution of thumbnails, screenshots, or small images without blur.

Image Upscaler is one of 105 free file tools on PrivaTools. All processing happens on our servers with zero-knowledge architecture — your files are never stored, never read, and never shared with third parties. No account required.

How to Image Upscaler with PrivaTools

  1. Upload an image — Select a JPG, PNG, or WebP image. The tool shows the current dimensions.
  2. Choose the scale — Select 2x (double) or 4x (quadruple) enlargement. The tool uses Lanczos resampling for sharp, artifact-free results.
  3. Download the upscaled image — Click Upscale. The enlarged image downloads in the same format as the original with the scale factor in the filename.

Frequently Asked Questions

What upscaling methods are available?

The tool uses Lanczos resampling, a high-quality interpolation algorithm that produces sharp, artifact-free results. Choose 2x or 4x enlargement.

What image formats are supported?

JPG, PNG, and WebP images are supported. The output format matches the input — upload a JPG, get a JPG back.

Is there a maximum image size?

The upscaled result cannot exceed 100 megapixels. For a 4x upscale, this means input images up to about 2500x2500 pixels.

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