Free Image Scaler
A low-resolution image looks fine as a thumbnail and falls apart the moment you enlarge it, print it, or use it as a background. Increasing the resolution means adding pixels - and doing it well means those new pixels look like real detail instead of blur. Here is how to do it for free, in your browser.
For screens, match the display: 1920×1080 for Full HD, 3840×2160 for 4K. For print, multiply the print size in inches by 300 - the usual standard for sharp photo prints.
| Print size | Pixels at 300 DPI |
|---|---|
| 4×6 in (10×15 cm) | 1200 × 1800 |
| 5×7 in (13×18 cm) | 1500 × 2100 |
| 8×10 in (20×25 cm) | 2400 × 3000 |
| A4 (21×29.7 cm) | 2480 × 3508 |
To pick a factor, divide the pixels you need by the pixels you have and round up. A photo 1000 px wide going to an 8×10 in print (2400 px) needs 2.4x, so choose 4x.
Enlarging can't add information the camera never captured, but it doesn't have to make the image worse either. Simple resizing blurs edges because it only averages neighbouring pixels. This tool uses a neural super-resolution model for smaller images, which reconstructs plausible edges and texture, and progressive resampling for large ones, which enlarges in steps to keep edges crisp. Sharpening and detail recovery are then applied on top.
On most photos you can enlarge 2x-4x without visible blur or blockiness. Very small or heavily compressed images improve too, but they can't gain detail that was never captured.
On desktop, up to 8192 pixels on the long side (about 42 megapixels). On phones, up to 4096 pixels (about 15 megapixels), so the browser doesn't run out of memory.
Yes. There is no signup, watermark or limit, and the image is processed in your browser - it is never uploaded.