waifu2x

Run open-source machine learning models with a cloud API

Online Vectorizer: Online raster to vector converter. Convert your images (jpeg, jpg or png) into scalable and clear vector art (svg,eps,dxf).

图片放大网站，完全免费，默认放大2X，最大可支持4X放大，无需注册。

不能放大图片，但是可以把由于过度 JPEG 压缩导致质量下降的照片进行修复，使边缘更加平滑。

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Upscalepics | Upscale and enhance images online for free