AI image upscaler
Free AI image upscaler that enlarges photos 2x and 4x right in your browser. No upload, no sign-up, private. Sharpen and restore detail in seconds.
100% private — files never leave your deviceYour browser can’t run this tool. Please try the latest Chrome, Edge or Safari on a desktop.
Loading the AI model (first time only)…
The AI model downloads once, then runs entirely on your device — this can take a few seconds on the first run. It’s cached afterwards, so next time is instant.
How to use
- Open your image. Drag and drop a photo or click to select a JPG, PNG, or WebP file from your device.
- Pick a scale. Choose 2x for a moderate boost or 4x to maximize size and detail recovery.
- Run the upscale. Start the process and let the Real-ESRGAN model enlarge and sharpen your image locally.
- Compare and download. Check the result against the original, then save the upscaled image to your device.
Features
- Real AI detail reconstruction. A Real-ESRGAN model rebuilds textures and edges instead of simply stretching pixels, so enlargements look sharper than a plain resize.
- 100% in your browser. Every step runs locally via ONNX Runtime Web, so your photos are never uploaded to a server.
- 2x and 4x scaling. Double or quadruple your image's dimensions to recover usable size from small or low-resolution sources.
- Free and no account. No sign-up, no watermark, and no usage limits beyond what your own device can handle.
- Works offline after first use. The AI model is cached on first run, so later upscales work even without an internet connection.
When to use it
- Enlarge a small profile picture or avatar so it stays sharp at a bigger size.
- Rescue low-resolution photos from old phones, screenshots, or web downloads.
- Prepare product or listing images at higher resolution for shops and marketplaces.
- Upsize artwork or illustrations before printing so they don't look pixelated.
- Boost a thumbnail or cropped image for use in a slideshow, document, or banner.
Is it private?
Your images are processed entirely in your browser and are never uploaded, shared, or stored on any server.
Frequently asked questions
Is this AI image upscaler free?
Yes, it's completely free with no sign-up, no watermark, and no hidden limits. You only need a modern browser and your own device's memory.
Are my photos uploaded anywhere?
No. The upscaling runs entirely in your browser using ONNX Runtime Web, so your images stay on your device and are never sent to a server.
What image formats and sizes are supported?
Common formats like JPG, PNG, and WebP work well. Very large images, especially at 4x, are slower and may run out of memory on low-end phones, so smaller source images are most reliable.
How does 2x and 4x upscaling work?
A Real-ESRGAN model predicts and reconstructs detail as it enlarges, multiplying both width and height by 2 or 4. Results look much better than a basic resize, though it can't invent detail that was never captured.
Why does the first run take longer?
The first upscale downloads the AI model once. After that it's cached in your browser, so subsequent runs are faster and work offline.
Will it perfectly restore a blurry or damaged photo?
It noticeably sharpens and adds detail, but it isn't magic. Heavily blurred, compressed, or noisy images improve but won't look like they were shot in high resolution originally.
Does it work on my phone?
Yes, on modern mobile browsers, but upscaling is memory-intensive. Large images at 4x can be slow or fail on low-memory phones, so try 2x or a smaller source first.
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