Upscale Image
Enhance image resolution 2x or 4x with AI-powered Real-ESRGAN. Get high-resolution PNG output — free, no sign-up, no watermarks.
Otras Herramientas de Imagen
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How to Upscale Images
Upload your image
Choose a file or drag and drop it into the upscaler.
Select scale
Choose 2x or 4x upscaling and click the button to start AI enhancement.
Download
Download the upscaled high-resolution PNG image.
Why LeanImg?
Low-resolution images are a common problem — old photos, screenshots, thumbnails, and web images often lack the detail needed for printing, presentations, or social media. Most upscaling tools either charge per image, add watermarks, or produce blurry results with simple interpolation. LeanImg is different — our upscaler is powered by Real-ESRGAN, a state-of-the-art neural network that adds genuine detail and sharpness. It is completely free, requires no sign-up, and produces high-quality results with no watermarks. Explore all of our free image tools to optimize your workflow.
AI-Powered Enhancement
Powered by Real-ESRGAN, a leading neural network for image super-resolution. Adds real detail, not just larger pixels.
Free, No Limits
No per-image fees, no watermarks, no sign-up. High-resolution output, unlimited usage — completely free.
No Software to Install
Upscale images online in seconds. No downloads, no sign-ups — just drag, drop, and go.
Frequently Asked Questions
How does LeanImg upscale images?
LeanImg uses Real-ESRGAN, a state-of-the-art neural network for image super-resolution. It intelligently enhances details and sharpness while increasing resolution by 2x or 4x, producing results far superior to simple interpolation methods like bicubic scaling.
What file formats does LeanImg support for upscaling?
You can upload JPG, PNG, WebP, AVIF, and GIF images. The output is always a high-quality PNG file. You can then compress or convert the result using our other free image tools.
What is the difference between 2x and 4x upscaling?
2x doubles your image dimensions (e.g. 512×512 becomes 1024×1024), while 4x quadruples them (e.g. 512×512 becomes 2048×2048). 4x produces larger files and takes longer to process. For most use cases, 2x provides excellent results.
Is the upscaling really free?
Yes, completely free with no limits. There is no sign-up, no watermarks, and no hidden fees. LeanImg processes your images at no cost using Real-ESRGAN AI upscaling.
Why is the output file larger than the original?
Upscaling increases the number of pixels in your image, which naturally results in a larger file. A 200 KB JPEG upscaled 4x can become 5–15 MB as a PNG. Use our free image compressor to reduce the file size after upscaling.
Have more questions? Learn more about LeanImg and how we process your images.
Upscaled images can be large — compress them to reduce file size. Or convert between formats like JPG, PNG, WebP, AVIF, and more. Need a different size? Resize your images to exact dimensions.