AI Image Upscaler
Enlarge JPG, PNG and WebP images 2× or 4× with a Real-ESRGAN AI model that runs in your browser. Free, no signup, no upload.
Upscale an image with AI
Drag & drop an image here, paste it, or choose a file.
JPG, PNG or WebP · up to 10 MB · up to 1 megapixel (e.g. 1024 × 1024 px)
The first run downloads the AI model (about 1.5 MB). Upscaling then runs on your device, so speed depends on your graphics hardware.
Your image is processed in your browser and is not uploaded to our server.
What Is an AI Image Upscaler?
An AI image upscaler makes a small image larger while adding sharpness that ordinary resizing cannot. When you enlarge a picture the usual way, the software only blends neighbouring pixels, so edges turn soft and blurry. An AI upscaler uses a neural network that has learned, from many pairs of low- and high-resolution images, what sharp edges, lines and textures typically look like. It then predicts that detail for your image.
This tool runs a Real-ESRGAN super-resolution model directly in your web browser. There is no upload and no queue: the model is downloaded once and the work is done by your device's graphics chip.
How to Upscale an Image
- Choose an image. Select a JPG, PNG or WebP file, drag it onto the tool, or paste a screenshot.
- Pick 2× or 4×. The tool shows the exact output size before you start.
- Press “Upscale image”. The first time, the AI model is downloaded (about 1.5 MB). A progress bar shows how far the upscaling has got, and you can cancel at any time.
- Compare. Drag the slider to see a standard resize on the left and the AI result on the right. Switch to Actual size to inspect details pixel by pixel.
- Download. The result keeps your original format and is named like
photo-upscaled-2x.jpg.
What You Can Use It For
- Logos, icons and illustrations – clean, flat artwork and line art usually benefit the most.
- Screenshots and interface graphics – enlarge a screenshot for slides or documentation with crisper edges.
- Small web images and thumbnails – get a usable larger version when the original is no longer available.
- Old digital photos – pictures from early phones and cameras can look cleaner at a larger size.
- Anime, cartoons and game art – the model was trained with this kind of content in mind and handles it well.
2× vs 4× Upscaling
2× doubles the width and height, so the image has four times as many pixels. It is the better choice when the image is already reasonably sized and you just need it a bit larger; results look natural and the file stays manageable.
4× quadruples the width and height, giving sixteen times as many pixels. It suits very small images such as icons, avatars or thumbnails. Because the AI has to invent more of the detail, 4× results can look more “painted”, and the files are much larger.
Both options use the same AI model, so processing time is similar; the difference is mainly in the output size and download time.
AI Upscaling vs Regular Resizing
| Regular resizing | AI upscaling | |
|---|---|---|
| How it works | Blends neighbouring pixels (bilinear or bicubic interpolation) | A trained neural network predicts sharper edges and texture |
| Edges and lines | Soft, blurry, sometimes jagged | Noticeably sharper and cleaner |
| Compression noise | Enlarged along with the image | Often reduced |
| Fine detail | Never added | Estimated, not recovered – can look smoothed or invented |
| Speed | Instant | Seconds to about a minute, depending on your device |
The comparison slider in the tool shows exactly this difference on your own image: the left side is a standard browser resize, the right side is the AI result.
Limitations
- It cannot recover lost information. The AI estimates what the image probably looked like. Details that are not in the original (a face in a crowd, a licence plate, tiny text) cannot be restored reliably.
- Small text may be distorted. Letters can be sharpened into the wrong shapes. Do not rely on an upscaled image to read documents, IDs or numbers. To extract text, use the image to text OCR tool on the original image.
- Photos can look smoother. Skin, hair, fur and grass may lose fine texture and take on a slightly painted look, especially at 4×.
- Size limits. Images up to 1 megapixel and 10 MB are accepted, so results are at most 4096 × 4096 px.
- Transparency is preserved, but the transparency mask itself is enlarged with standard resizing, not AI.
- Device requirements. The browser needs graphics acceleration (WebGL). On older phones, large images at 4× may be slow or fail with a memory error; 2× or a smaller image usually works.
- Only still images. Animated GIF, PNG or WebP files are not supported.
Privacy: Your Image Stays on Your Device
The upscaling runs entirely in your browser. When you press Upscale image, your browser downloads the AI model and the TensorFlow.js runtime from ocrtool.net; your image itself is not uploaded to OCRTool or to any other service, and we never see it. The result exists only in your browser until you download it, and it is discarded when you close or leave the page.
Like the rest of OCRTool.net, this page uses analytics and advertising scripts that record page visits; they do not receive your image. See our privacy policy for details.
This differs from our OCR tools: text recognition sends the image over an encrypted connection to an OCR service. The upscaler does not send your image anywhere.
About the AI Model
The upscaler uses the compact Real-ESRGAN model realesr-animevideov3, a super-resolution network published by Xintao Wang and colleagues under the BSD-3-Clause licence. It is about 1.2 MB and runs with TensorFlow.js on your device's GPU. The model was trained with animation-style content in mind, so it is strongest on illustrations, graphics and clean edges; on natural photos it sharpens edges well but may smooth fine texture.
Licence notices: third-party notices.
Frequently Asked Questions
Is this real AI upscaling or just resizing?
It is real AI upscaling. Your image is processed by a Real-ESRGAN neural network that was trained to turn low-resolution images into sharper high-resolution ones. Ordinary resizing only interpolates between existing pixels, which is why it looks soft. You can compare both results side by side with the slider after upscaling.
Is my image uploaded to a server?
No. The AI model is downloaded to your browser and the upscaling runs on your own device. Your image is not sent to OCRTool or to any other service, and nothing is stored after you close the page.
Is the AI Image Upscaler free?
Yes. It is free to use and does not require an account or signup, and no watermark is added.
Which image formats are supported?
JPG, PNG and WebP. The upscaled image is saved in the same format as the original. PNG and WebP transparency is kept. If your browser cannot save WebP, the result is saved as PNG instead.
What is the maximum image size?
Files up to 10 MB and images up to 1 megapixel (for example 1024 × 1024 px), with no side longer than 2048 px. That means a 4× result can be up to 4096 × 4096 px.
Should I choose 2× or 4×?
Use 2× when you need a moderately larger image, for example for a web page or a presentation. Use 4× for very small images such as thumbnails, icons or old low-resolution pictures. 4× produces a much larger file and takes a little longer to finish.
Why is there no 8× option?
The model works at 4×. Running it twice to reach 8× multiplies any artefacts and creates very large images that many phones and browsers cannot handle, so we only offer 2× and 4×, which give dependable results.
How long does upscaling take?
It depends on your device's graphics hardware and the image size. On a typical laptop or recent phone a small image takes a few seconds, and a 1 megapixel image at 4× can take from several seconds to a minute or more. The first run also downloads the model (about 1.5 MB).
Can it make blurry text readable?
Only to a limited degree. The AI sharpens edges, but it cannot recover letters that are not in the image, and very small or blurry text can come out distorted. To get the text from an image, use our OCR tool on the original image instead.
Does it work on my phone?
Yes, in current versions of Chrome, Safari, Edge and Firefox on phones, tablets and computers. The browser needs graphics acceleration (WebGL). Large images at 4× may be slow or run out of memory on older phones; 2× is lighter.