Image Upscaler — 2× 3× 4×
Enlarge images with smart multi-step resampling. Three modes for photos, artwork, and pixel art. Instant — runs entirely in your browser, nothing uploaded.
Three Upscale Modes
Smooth for photos, Sharp for artwork, Crisp for pixel art — each optimised differently.
2×, 3×, and 4× Scale
Up to 4× enlargement with a 16MP safety cap to prevent browser crashes.
Instant Results
Canvas API is GPU-accelerated. No model download, no wait, no server.
How multi-step upscaling works
A common mistake when enlarging images is jumping straight to the target size in one operation. Scaling from 500px to 2000px in one step forces the resampling algorithm to fill in a lot of missing data at once — the result is blurry and soft.
Multi-step upscaling solves this by scaling up in increments of 1.5× at a time. Each intermediate step has less "missing" data to reconstruct, so edges stay sharper and more natural. The final result is noticeably crisper than a single-step resize at the same target size.
Which mode to use
| Mode | Technique | Best for |
|---|---|---|
| Smooth | Multi-step high-quality bilinear | Photographs, portraits, landscapes |
| Sharp | Multi-step bilinear + unsharp mask | Illustrations, logos, artwork, product shots |
| Crisp | Nearest-neighbour (no smoothing) | Pixel art, game sprites, low-res screenshots |
100% browser-based — no model download, no server
Processing uses the browser's Canvas API which is hardware-accelerated on your GPU. Results are instant. Your images never leave your device and there is nothing to download before the tool works.
Frequently asked questions
What is the difference between Smooth, Sharp, and Crisp modes?
Smooth uses high-quality bilinear interpolation stepped in increments — ideal for photographs where you want natural-looking enlargements. Sharp adds an unsharp masking pass that enhances edges — best for illustrations, logos, and artwork. Crisp disables all interpolation (nearest-neighbour) — perfect for pixel art and low-res screenshots where you want perfectly clean, blocky edges.
How is this better than just resizing in Photoshop?
The multi-step approach matters. Instead of jumping straight to the target size (which causes blurring), the tool upscales in increments of 1.5× at a time. Each step preserves more edge detail than a single large jump. The Sharp mode also runs a 3×3 sharpening kernel on the final result to restore crispness lost during resampling.
Is there a maximum image size?
The tool enforces a 16-megapixel output limit to prevent browser crashes. For example, a 2000×2000px image can be upscaled 2× (to 4000×4000px = 16MP) but not 4× (which would be 64MP). Use a smaller source image or lower scale if you hit this limit.
How long does upscaling take?
Upscaling is instant for most images — typically under 2 seconds. The Canvas API is GPU-accelerated in modern browsers. The sharpening pass (Sharp mode) adds a brief CPU computation but is still very fast compared to server-side processing.
Are my images uploaded anywhere?
No. All processing uses the browser's built-in Canvas API and runs entirely on your device. Your images never leave your browser.
What format is the output?
Output is a lossless PNG file. This preserves full quality from the upscaling process. If you need a smaller file, use the Image Converter to convert the PNG to WebP or JPG afterwards.