The verdict
Bigjpg's specialty is line art and anime — the deep convolutional model is trained on that style and it shows in output quality compared to general-purpose upscalers. For manga panels, illustration cleanup, and any line-drawn content where preserving fine linework matters, Bigjpg holds its own against more polished competitors. The honest critique: the daily free-tier limits feel restrictive (a few free images per day before paid tier kicks in), the interface looks dated, and the same anime tuning that makes it strong here makes it weaker for photographic material. For occasional anime upscaling, the free tier covers it. For heavy use, the pricing tiers don't compete well against Waifu2x (free, no limits, similar specialty) unless you specifically need the API. For photographic upscaling, this isn't the right category of tool — alternatives above are stronger fits.