Bigjpg AI is an AI-powered online tool for lossless image upscaling that enhances image resolution and quality using deep convolutional neural networks.
This tool excels at upscaling anime-style images and illustrations, delivering noticeable results, and also supports upscaling and optimizing standard photos.
There are free and paid versions. The free plan has limits on processing quotas and maximum upscaling factors; the paid plan offers higher upscaling, larger files, and faster processing.
According to the site, user-uploaded and processed images are automatically deleted after a period; links are stored securely with encryption, and others cannot access them unless you share.
It supports web usage online, and offers Windows, Mac, iOS and Android apps; some versions support offline processing.
The free plan typically supports images up to 5MB and 3000×3000 pixels, with up to 4x upscaling and a monthly processing limit.

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