Waifu2x ncnn: Image upscaler

Archie Meng

Contains adsIn-app purchases

About this app

The first decent GPU accelerated image upscaler / enlarger / enhancer on Android.

Still bothering for the upscale amount limits of online services? Try this app for free. No amount limits and forced queue time here. Only your device performance can limit what you can do here. :)

It runs on your own devices locally, and doesn't require you to upload any images to some remote servers.

What is processed on your devices, always stays on your devices.

It supports the famous image upscale / denoise models: CUNet / UpConv-Photo / UpConv-Anime / RealCUGAN models.

- 1. The google play service and ads SDK still needs network access.
- 2. More models including RealSR, Real-ESRGAN will be ported in the future.
- 3. The actual elapsed time depends on device performance.
- 4. Click for 5 times on Version number in settings to enable the hidden advanced settings.
- 5. The "process image as a whole" mode is the default and only way of processing now.

For those devices which receives blank result during GPU mode processing, try to use CPU mode and see if it works.

Note: This may be caused by an out-of-date GPU driver. If you can the GPU driver for your device (either by flashing a newer ROM or using a GPU driver update module), please try to do so first if you meet processing errors. And this is how I solve the GPU processing problems on my Redmi 3S. :)

Ratings and reviews

It's a great app and works really well ( though it's seems the Denoise function isn't working properly for colored illustrations on the RealCUGAN model as they all look the same when I upscale an artwork). Edit: it seems after the latest update. it no longer works on larger images. Hope it gets fixed soon

worked great until the last update (July 2025 update) but now I select my picture and the upscale settings. Then instead of switching to the processing screen with the image being upscaled, i'm met with a screen with a gray box and a pause button. And nothing happens.

It used to be great but this app doesn't seem to work anymore after the recent update. After I pick an image and hit the process button, the image will turn white and just sit there doing nothing. Even if I wait a long time nothing happens.

What’s new

Update edge-to-edge design to prevent app content from overlapping the status bar.
Adjust button margins for a consistent appearance across the entire interface.