Upscale Image Online
Enlarge an image 2x, 3x, or 4x using high-quality interpolation (Lanczos3 / Magic Kernel Sharp). Free, private, browser-only.
Enlarge an Image With Better Quality Than a Basic Resize
Scale an image up 2x, 3x, or 4x using the same high-quality WASM interpolation algorithms (Lanczos3, Magic Kernel Sharp) used by professional image tools — sharper results than a browser's default resize. This is classical interpolation, not AI: it sharpens and smooths the enlargement, but can't invent detail that isn't already in the original.
Which algorithm should I use?
| Algorithm | Best for |
|---|---|
| Sharp (Magic Kernel Sharp 2021) | Most photos — a crisp default |
| Lanczos3 | Smoother results, fewer sharpening artefacts |
| Mitchell | A balanced middle ground |
Need to shrink an image instead? Try the Resize tool. Need a specific pixel size rather than a multiplier? Resize also lets you enter exact dimensions.
Frequently asked questions
Is this AI upscaling?
No — this uses classical high-quality interpolation (Lanczos3 / Magic Kernel Sharp), not an AI model. It sharpens and smooths the enlargement well, but can’t generate new detail the way AI super-resolution can.
How is this different from the Resize tool?
Resize handles both shrinking and enlarging with a standard browser-quality algorithm. This tool uses WASM-based interpolation specifically tuned for enlarging, giving a noticeably sharper result at 2x-4x.
Which algorithm should I pick?
Magic Kernel Sharp 2021 is a good default for most photos. Lanczos3 gives a smoother result with fewer sharpening artefacts; Mitchell sits in between.
Will my upscaled image look as good as a real high-resolution photo?
No — no interpolation algorithm can add detail that was never captured. It produces the best-looking enlargement possible from your source, not a substitute for a higher-resolution original.
What’s the biggest scale factor I can use?
Up to 4x is offered here. Beyond that, softness becomes very noticeable regardless of algorithm, since there’s proportionally less real detail to work with.
Is my image uploaded anywhere?
No — upscaling runs entirely in your browser via WebAssembly.
Does upscaling change the file format?
No — the output keeps your original format (JPEG, PNG, or WebP).
Can I upscale a screenshot or graphic, not just a photo?
Yes, though flat graphics with hard edges sometimes look best with Lanczos3 rather than the Sharp default — try both and compare.