Two Engines, One Tool — Pick What You Need
Every image upscaler faces the same fundamental problem: enlarging a picture means inventing pixels that were never captured. There are two honest ways to do that, and this tool gives you both.
- ⚡ Fast mode uses progressive multi-step interpolation followed by an unsharp mask. It scales in repeated 2× passes (which produces visibly cleaner edges than a single big jump) and then restores the crispness that any interpolation softens. It's instant, works at any resolution, and needs zero downloads.
- 🤖 AI mode runs an ESRGAN super-resolution neural network directly in your browser. Instead of interpolating, the model predicts what the missing detail should look like based on millions of training examples — recovering sharp edges, texture and structure that no amount of classical scaling can produce.
Which Mode Should You Use?
| ⚡ Fast | 🤖 AI | |
|---|---|---|
| Speed | Instant | 10–60+ seconds per image |
| First-use download | None | ~10 MB model (cached after) |
| Max input size | Any | Around 1400×1400 px |
| Detail recovery | Sharpened, not reconstructed | Genuine reconstruction |
| Best for | Print sizing, batches, large files, quick jobs | Small photos, old images, logos, restoration |
What Upscaling Can and Cannot Do
It's worth being straight about this, because plenty of "AI upscaler" sites are not. Upscaling cannot recover information that was never recorded — a blurry, out-of-focus photo stays blurry, and heavily compressed JPEG artifacts often get more visible when enlarged. What upscaling does well is make a small but sharp image usable at a larger size: a 400px product photo that needs to be 1600px, an old avatar, a low-resolution scan, a logo that only exists as a small PNG.
For the best possible result, start from the highest-quality source you have. If your image is already compressed, avoid re-compressing it further — and consider running the upscaled output through our image compressor only at the very end.
Popular Uses
- Print preparation — a web-sized image needs far more pixels to print sharply at 300 DPI.
- Old photos & scans — low-resolution digital camera shots and scanned prints benefit enormously from AI mode.
- Product listings — marketplaces often require minimum dimensions like 1000×1000 px.
- Logos & graphics — enlarge a small PNG logo for a banner or presentation.
- Wallpapers — stretch an image to fit a larger screen without it turning to mush.
Upscaling and File Size
Enlarging multiplies pixel count by the square of the factor — a 4× upscale contains 16× more pixels, so expect a much larger file. If the result needs to fit an upload limit, run it through our JPG compressor or compress to 100 KB tool afterwards. Need the opposite direction? The image resizer handles precise downscaling.