Online Image Upscaler
Upscale any image up to 4× its original size using Lanczos3 resampling, a high-quality filter that preserves edges and details far better than the browser's default bilinear interpolation. Use it on photos, illustrations, game sprites, icons, or anything else that needs to look sharp at a larger size. Pick a preset (1.5×, 2×, 3×, 4×) or set exact target dimensions.
How to upscale an image
- Drop your image onto the tool or click to browse.
- Pick a target scale factor (2x, 3x or 4x) or enter exact dimensions.
- The tool upscales using high-quality Lanczos resampling.
- Download the upscaled copy. The original is left untouched.
Common use cases
- Enlarging small legacy photos to modern display resolutions without a full AI pipeline.
- Rendering a thumbnail at full-resolution size for a mockup or pitch.
- Upscaling assets to Retina 2x for a redesign where the originals are only standard resolution.
- Producing a larger version of a stock image for a banner where the source is too small.
Frequently asked questions
Does upscaling add detail?
Not really. Classical upscaling (Lanczos, bicubic) interpolates existing pixels — it cannot invent detail that was not there. For true detail reconstruction, use an AI upscaler with a specialised model.
What scale factor is safe?
2x is usually safe and produces clean results. 3x and 4x amplify any existing noise or blur; use them only when the source is very clean.
Will the file be larger?
Yes. Doubling each dimension quadruples the pixel count, which usually increases file size by a similar factor depending on compression.
Is my image uploaded?
No. Upscaling runs locally in your browser.
About Lanczos3 upscaling
Lanczos3 is a sinc-based resampling filter widely used in professional image editors because it produces crisp, artifact-free enlargements. Unlike AI-based super-resolution, it doesn't invent new detail — it reconstructs pixels mathematically, which makes it fast, deterministic, and perfectly private. It's the same algorithm used by imaging tools like ImageMagick and GIMP for their highest-quality resize mode.
- Lanczos3 resampling for sharp enlargements
- Presets: 1.5×, 2×, 3×, 4× — or custom dimensions
- Export as PNG, JPG, or WebP with adjustable quality
- Direct handoff from Image Grid Splitter
- No AI, no uploads, no account — pure math in your browser
- Works on photos, illustrations, icons, and game sprites
Free. No signup. No file uploads. Ads via AdSense (consent required).
By Marco B. ·