Free AI Image Upscaler Online
Enhance photo resolution 2× or 4× in seconds. Lanczos resampling and edge sharpening give crisper results than a blurry resize — free, private, no account needed.
Output capped at 4096 px on the longest side.
Small images are enhanced instantly in your browser. Larger outputs are processed on our server — no third-party API, no credit limits.
Small images are processed entirely in your browser. Larger images are processed on our server and never stored.
How Image Upscaling Works
Traditional upscaling (simple bilinear stretch) produces blurry results because it just averages neighbouring pixels across a larger canvas. This tool takes a smarter, two-path approach depending on your image size.
Small images (output ≤ ~4 MP) are enhanced in your browser using a real neural super-resolution model — ESRGAN (Enhanced Super-Resolution Generative Adversarial Network). The ~10 MB model loads once via CDN and is cached for all future visits. It reconstructs detail rather than interpolating, giving visibly sharper faces, textures, and edges. No upload needed — 100% private.
Larger images are processed on our server using PHP Imagick with the LANCZOS2SHARP filter in multi-step 2× passes, plus a precision unsharp mask. No third-party API is involved, so there are no credit limits or outages.
What Makes It Better than a Simple Resize
- Multi-step upscaling preserves edge sharpness better than a single large resize
- Lanczos resampling avoids the ringing and blur artefacts of bilinear/bicubic methods
- Unsharp mask sharpening recovers edge detail lost during resampling
- No compression or quality loss in the download — full-resolution output
When to Use AI Upscaling
Old or Low-Res Photos
Restore scanned family photos, old mobile shots, or compressed social media images to print-quality resolution.
Design & Print
Upscale a small logo or asset before using it in a large-format print, banner, or billboard without visible pixelation.
Product Photography
Boost e-commerce product image resolution so customers can zoom in without seeing compression artifacts.
Game Textures & Assets
Upscale low-resolution sprites, textures, or UI assets for use in higher-resolution game builds.
Tips for Best Results
- Start with a clean source: Upscaling amplifies both detail and noise. If your image is noisy or heavily compressed, reduce noise first for the best output.
- Use 4× for very small images: If your source is under 300 px on either side, 4× gives dramatically better results than 2× — you'll stay well under the output cap.
- Use 2× for already-decent images: Images above 1000 px often benefit more from a gentle 2× upscale than an aggressive 4× — you get sharpness without over-stretching.
- Avoid re-upscaling an already-upscaled image: Upscaling an image that was already upscaled compounds any artefacts. Always upscale from the original source.
- JPG artefacts get amplified: For heavily compressed JPGs, the unsharp mask will sharpen compression blocks as well as real edges. Convert to PNG or denoise first when possible.
- Output cap is 4096 px: Very large source images will have their upscale factor automatically reduced to keep the output within the 4096 px limit.
Frequently Asked Questions
Related Image Tools
Other free tools to compress, convert, and edit your images.