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Upscale

Enlarge images to any size with AI super-resolution

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COMBb2's AI Image Upscaler uses deep-learning super-resolution to enlarge your photos to any size while preserving sharp details, fine textures, and natural edges. Unlike simple interpolation that produces blurry results, our neural network reconstructs realistic detail at any scale you choose. Everything runs 100% in your browser - your images are never uploaded anywhere.

Common Use Cases

  • Print preparation
    Enlarge photos to poster or canvas size without visible pixelation.
  • Social media
    Upscale older or compressed images to meet platform resolution requirements.
  • Rescuing low-res images
    Breathe new life into small screenshots, thumbnails, or cropped photos.
  • E-commerce product images
    Enlarge product photos for zoom views and detail galleries.
  • Old family photos
    Restore small scanned prints to modern resolution for reprinting or sharing.

How It Works

The upscaler splits your image into small overlapping tiles and processes each through a deep-learning neural network running locally via WebAssembly. For large upscale targets, it runs multiple passes automatically, then resizes to your exact target dimensions using high-quality Lanczos resampling.

Why Privacy Matters Here

Most online upscalers require you to upload your photos to their servers. COMBb2 runs the AI entirely in your browser using on-device processing. Your images never leave your computer - there are no server requests, no cloud storage, and no data retention. This makes it safe for personal photos, confidential documents, and client work under NDA.

Frequently Asked Questions

What happens if I close the browser or it crashes during upscaling?+
Nothing is saved to your device during processing. All image data stays in your browser's temporary memory (RAM) - no files are written to disk. If the browser closes or crashes, the operating system automatically reclaims all that memory. There are no leftover temporary files to clean up.
Is there a maximum image size I can upscale?+
The AI processes your image in small tiles, so very large outputs are handled efficiently. However, your browser imposes canvas dimension and area limits (typically ~32,000 px per side and ~268 MP on Chrome, ~16,384 px on Safari). The tool detects these limits automatically and shows a warning if your target size exceeds them.
Does my image get uploaded to a server?+
No. Everything happens 100% in your browser using on-device AI. Your photos never leave your computer - there is no server, no cloud, and no network requests during processing.
Why does the second half of processing take much longer than the first?+
Multi-pass upscaling processes the image in two rounds. The second pass works on the already-enlarged output of the first pass, which has 4x more pixels. The progress bar is weighted to reflect this - it moves proportionally to actual work done.
Can I cancel an upscale that's taking too long?+
Yes. Click the Cancel button at any time during processing. It immediately stops the AI worker and frees all memory. You can then start a new upscale with different settings.
What's the difference between photo and line art modes?+
The tool auto-detects whether your image is a photograph or line art (logos, illustrations, comics). Each type uses a different AI model variant optimized for that content. Photos preserve natural textures, while line art mode keeps edges crisp and colors flat.
How does COMBb2 compare to cloud-based upscalers like Topaz or Let's Enhance?+
COMBb2 runs entirely in your browser with no uploads, making it completely private. Cloud services require uploading your photos to third-party servers. For privacy-sensitive images or quick tasks, COMBb2 is the better choice.

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