Upscale Image
Enlarge an image with Lanczos resampling and a light sharpening pass.
Image tools Client-side Lanczos resampling + unsharp mask (pure TS)
Tool preview
How to use it
- 01
Drop an image.
- 02
Pick a scale factor.
- 03
Download the larger PNG.
Limitations
- ! This is interpolation, not AI reconstruction: it cannot invent detail that was never captured.
- ! A 4× upscale produces 16× the pixels, so the file grows accordingly.
- ! Very large inputs may hit the browser canvas size limit.
FAQ
Is this the same as an AI upscaler?
No. Lanczos is a high-quality resampling filter: it produces smooth edges and avoids blockiness, but it cannot hallucinate missing detail.
Why does it look slightly crisper?
A small unsharp mask restores edge contrast that interpolation softens.
Is the image uploaded?
No.
Files never leave your device
Processing happens in your browser using the File API, WebAssembly and Web Workers. There is no upload endpoint.
Technical details
- Processing
- Client-side
- Implementation
- Lanczos resampling + unsharp mask (pure TS)
- Category
- Image tools
- Network requests
- None while processing