画像アップスケーラー

高品質な補間により、画像を2倍または4倍に拡大します。

Uses high-quality Canvas bicubic interpolation. Runs on any device — no GPU or AI model required.

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About 画像アップスケーラー

OptiPix Image Upscaler uses an AI super-resolution model to intelligently enlarge images while adding realistic detail that simple resizing cannot achieve. Traditional upscaling produces blurry results because it just interpolates between existing pixels, but our AI model understands image content and generates new, plausible details. The model runs entirely in your browser — no server uploads, no API calls, complete privacy. It downloads once (approximately 15 MB) and works offline afterward. Choose between 2x and 4x upscaling modes depending on how much enlargement you need. This is ideal for upscaling old photos, improving low-resolution screenshots, enlarging thumbnails for printing, or preparing images for high-DPI displays. The tool accepts JPEG, PNG, and WebP inputs and outputs high-quality PNG files. Processing time depends on image size and your device's GPU capabilities, with most images completing in a few seconds.

How It Works

The upscaler uses a lightweight super-resolution neural network (based on ESRGAN architecture) that runs in your browser via ONNX Runtime WebAssembly. The model analyzes the low-resolution input and generates high-frequency details that are perceptually convincing.

Use Cases

•Upscale old family photos for printing at larger sizes
•Improve low-resolution screenshots for presentations
•Enlarge thumbnails and profile pictures
•Prepare images for high-DPI (Retina) displays
•Enhance product images for e-commerce listings

Frequently Asked Questions

How does AI upscaling differ from regular resizing?

Regular resizing simply interpolates between existing pixels, creating blurry results. AI upscaling uses a neural network trained on millions of images to generate realistic new details, producing much sharper and more natural-looking enlargements.

What upscaling factors are available?

You can upscale images by 2x or 4x. A 2x upscale doubles both width and height (4x total pixels), while 4x quadruples both dimensions (16x total pixels).

How long does upscaling take?

Processing time depends on the image size and your device. Most images complete in 2-10 seconds. Larger images and 4x upscaling take longer.

Is there a size limit for input images?

While there is no hard limit, very large images may cause memory issues on some devices. For best results, start with images under 2000x2000 pixels for 4x upscaling.

Does this work offline?

Yes. After the AI model downloads on first use (about 15 MB), the tool works completely offline with no internet connection needed.

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