---
license: bsd-3-clause
tags:
  - super-resolution
  - real-esrgan
  - onnx
  - image-upscaling
library_name: onnx
---

# Tinier upscale models

ONNX exports of the official [Real-ESRGAN](https://github.com/xinntao/Real-ESRGAN)
weights, used by the in-browser AI upscaler at [tinier.app/upscale-image](https://tinier.app/upscale-image)
(onnxruntime-web, WebGPU/WASM).

| File | Source weights | Params | Size |
|---|---|---|---|
| `realesr-general-x4v3.onnx` | realesr-general-x4v3.pth (SRVGGNetCompact) | 1.2M | 4.6 MB |
| `realesrgan-x4plus.onnx` | RealESRGAN_x4plus.pth (RRDBNet) | 16.7M | 64 MB |

Export details: fp32, opset 17, dynamic H/W axes.
Contract: input `float32 [1, 3, h, w]`, RGB in `[0, 1]`, NCHW → output `float32 [1, 3, 4h, 4w]`.

Both exports are numerically verified against the PyTorch originals
(max abs diff ~1e-6). Conversion script:
[`scripts/export-onnx-models.py`](https://github.com/jonathanst29/tinier) in the Tinier repo.

License: BSD-3-Clause, inherited from the upstream Real-ESRGAN weights.