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Upscale Image

Enlarge an image with high-quality Lanczos resampling — fast and fully client-side. Pro feature.

How to use Upscale Image

  1. Upload an image and pick a scale factor (2x, 3x, or 4x) and method.
  2. Lanczos (sharp) gives crisper edges for graphics and text; bilinear (smooth) is gentler on photos.
  3. Download the upscaled PNG.

Limitations

  • This uses classic resampling algorithms (Lanczos/bilinear), not an AI super-resolution model — it sharpens and interpolates existing pixels rather than inventing new detail. For genuinely adding detail beyond what's in the source, dedicated AI upscaling services will outperform this.
  • Output is capped at 24 megapixels to keep processing fast in-browser.

About this tool

Upscale Image is a single-purpose utility on instant.tw, a free toolbox of calculators, converters, generators, and quick lookups. Everything works in your browser — nothing is uploaded, nothing is stored on a server unless explicitly noted.

Category: Image & Creative Media. Browse more Image & Creative Media tools.