Browser-based AI upscaler enlarges photos locally using a 5 MB super-resolution model

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A developer tested a browser tool that enlarged a 563×449 photo to 1576×1257 without uploading it, taking about 14 seconds. The output file grew from 147 KB to 515.6 KB, despite no new real information being added. Unlike ordinary resizing, which only blends existing pixels, super-resolution networks such as Real-ESRGAN paint in statistically plausible detail learned from training data. The article advises using such models for photos and artwork, but plain resizing for screenshots and text, where invented details can be wrong. Because large images exceed browser memory, the tool processes them in overlapping tiles, which also explains its progress reporting and input size limits.

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