---
library_name: pytorch
license: other
tags:
- generative_ai
- android
pipeline_tag: unconditional-image-generation

---

![](https://qaihub-public-assets.s3.us-west-2.amazonaws.com/qai-hub-models/models/stable_diffusion_v2_1/web-assets/model_demo.png)

# Stable-Diffusion-v2.1: Optimized for Qualcomm Devices

Generates high resolution images from text prompts using a latent diffusion model. This model uses CLIP ViT-L/14 as text encoder, U-Net based latent denoising, and VAE based decoder to generate the final image.

This is based on the implementation of Stable-Diffusion-v2.1 found [here](https://github.com/CompVis/stable-diffusion/tree/main).
This repository contains pre-exported model files optimized for Qualcomm® devices. You can use the [Qualcomm® AI Hub Models](https://github.com/qualcomm/ai-hub-models/blob/main/src/qai_hub_models/models/stable_diffusion_v2_1) library to export with custom configurations. More details on model performance across various devices, can be found [here](#performance-summary).

Qualcomm AI Hub Models uses [Qualcomm AI Hub Workbench](https://workbench.aihub.qualcomm.com) to compile, profile, and evaluate this model. [Sign up](https://myaccount.qualcomm.com/signup) to run these models on a hosted Qualcomm® device.

## Deploy to Snapdragon X Elite NPU
Please follow the [Stable Diffusion Windows App](https://github.com/quic/ai-hub-apps/tree/main/apps/windows/python/StableDiffusion) tutorial to quantize model with custom weights.

## Quantize and Deploy Your Own Fine-Tuned Stable Diffusion

Please follow the [Quantize Stable Diffusion]({REPOSITORY_URL}/tutorials/stable_diffusion/quantize_stable_diffusion.md) tutorial to quantize model with custom weights.

## Getting Started
There are two ways to deploy this model on your device:

### Option 1: Download Pre-Exported Models

Below are pre-exported model assets ready for deployment.

| Runtime | Precision | Chipset | SDK Versions | Download |
|---|---|---|---|---|
| PRECOMPILED_QNN_ONNX | w8a16 | Snapdragon® 8 Elite Gen 5 Mobile | QAIRT 2.42, ONNX Runtime 1.24.3 | [Download](https://qaihub-public-assets.s3.us-west-2.amazonaws.com/qai-hub-models/models/stable_diffusion_v2_1/releases/v0.51.0/stable_diffusion_v2_1-precompiled_qnn_onnx-w8a16-qualcomm_snapdragon_8_elite_gen5.zip)
| PRECOMPILED_QNN_ONNX | w8a16 | Snapdragon® X2 Elite | QAIRT 2.42, ONNX Runtime 1.24.3 | [Download](https://qaihub-public-assets.s3.us-west-2.amazonaws.com/qai-hub-models/models/stable_diffusion_v2_1/releases/v0.51.0/stable_diffusion_v2_1-precompiled_qnn_onnx-w8a16-qualcomm_snapdragon_x2_elite.zip)
| PRECOMPILED_QNN_ONNX | w8a16 | Snapdragon® X Elite | QAIRT 2.42, ONNX Runtime 1.24.3 | [Download](https://qaihub-public-assets.s3.us-west-2.amazonaws.com/qai-hub-models/models/stable_diffusion_v2_1/releases/v0.51.0/stable_diffusion_v2_1-precompiled_qnn_onnx-w8a16-qualcomm_snapdragon_x_elite.zip)
| PRECOMPILED_QNN_ONNX | w8a16 | Snapdragon® 8 Gen 3 Mobile | QAIRT 2.42, ONNX Runtime 1.24.3 | [Download](https://qaihub-public-assets.s3.us-west-2.amazonaws.com/qai-hub-models/models/stable_diffusion_v2_1/releases/v0.51.0/stable_diffusion_v2_1-precompiled_qnn_onnx-w8a16-qualcomm_snapdragon_8gen3.zip)
| PRECOMPILED_QNN_ONNX | w8a16 | Qualcomm® QCS8550 (Proxy) | QAIRT 2.42, ONNX Runtime 1.24.3 | [Download](https://qaihub-public-assets.s3.us-west-2.amazonaws.com/qai-hub-models/models/stable_diffusion_v2_1/releases/v0.51.0/stable_diffusion_v2_1-precompiled_qnn_onnx-w8a16-qualcomm_qcs8550_proxy.zip)
| PRECOMPILED_QNN_ONNX | w8a16 | Snapdragon® 8 Elite For Galaxy Mobile | QAIRT 2.42, ONNX Runtime 1.24.3 | [Download](https://qaihub-public-assets.s3.us-west-2.amazonaws.com/qai-hub-models/models/stable_diffusion_v2_1/releases/v0.51.0/stable_diffusion_v2_1-precompiled_qnn_onnx-w8a16-qualcomm_snapdragon_8_elite_for_galaxy.zip)
| PRECOMPILED_QNN_ONNX | w8a16 | Snapdragon® 7 Gen 4 Mobile | QAIRT 2.42, ONNX Runtime 1.24.3 | [Download](https://qaihub-public-assets.s3.us-west-2.amazonaws.com/qai-hub-models/models/stable_diffusion_v2_1/releases/v0.51.0/stable_diffusion_v2_1-precompiled_qnn_onnx-w8a16-qualcomm_snapdragon_7gen4.zip)
| PRECOMPILED_QNN_ONNX | w8a16 | Qualcomm® QCM6690 | QAIRT 2.42, ONNX Runtime 1.24.3 | [Download](https://qaihub-public-assets.s3.us-west-2.amazonaws.com/qai-hub-models/models/stable_diffusion_v2_1/releases/v0.51.0/stable_diffusion_v2_1-precompiled_qnn_onnx-w8a16-qualcomm_qcm6690.zip)
| PRECOMPILED_QNN_ONNX | w8a16 | Qualcomm® QCS9075 | QAIRT 2.42, ONNX Runtime 1.24.3 | [Download](https://qaihub-public-assets.s3.us-west-2.amazonaws.com/qai-hub-models/models/stable_diffusion_v2_1/releases/v0.51.0/stable_diffusion_v2_1-precompiled_qnn_onnx-w8a16-qualcomm_qcs9075.zip)
| QNN_CONTEXT_BINARY | w8a16 | Snapdragon® 8 Elite Gen 5 Mobile | QAIRT 2.45 | [Download](https://qaihub-public-assets.s3.us-west-2.amazonaws.com/qai-hub-models/models/stable_diffusion_v2_1/releases/v0.51.0/stable_diffusion_v2_1-qnn_context_binary-w8a16-qualcomm_snapdragon_8_elite_gen5.zip)
| QNN_CONTEXT_BINARY | w8a16 | Snapdragon® X2 Elite | QAIRT 2.45 | [Download](https://qaihub-public-assets.s3.us-west-2.amazonaws.com/qai-hub-models/models/stable_diffusion_v2_1/releases/v0.51.0/stable_diffusion_v2_1-qnn_context_binary-w8a16-qualcomm_snapdragon_x2_elite.zip)
| QNN_CONTEXT_BINARY | w8a16 | Snapdragon® X Elite | QAIRT 2.45 | [Download](https://qaihub-public-assets.s3.us-west-2.amazonaws.com/qai-hub-models/models/stable_diffusion_v2_1/releases/v0.51.0/stable_diffusion_v2_1-qnn_context_binary-w8a16-qualcomm_snapdragon_x_elite.zip)
| QNN_CONTEXT_BINARY | w8a16 | Snapdragon® 8 Gen 3 Mobile | QAIRT 2.45 | [Download](https://qaihub-public-assets.s3.us-west-2.amazonaws.com/qai-hub-models/models/stable_diffusion_v2_1/releases/v0.51.0/stable_diffusion_v2_1-qnn_context_binary-w8a16-qualcomm_snapdragon_8gen3.zip)
| QNN_CONTEXT_BINARY | w8a16 | Qualcomm® QCS8550 (Proxy) | QAIRT 2.45 | [Download](https://qaihub-public-assets.s3.us-west-2.amazonaws.com/qai-hub-models/models/stable_diffusion_v2_1/releases/v0.51.0/stable_diffusion_v2_1-qnn_context_binary-w8a16-qualcomm_qcs8550_proxy.zip)
| QNN_CONTEXT_BINARY | w8a16 | Qualcomm® SA8775P | QAIRT 2.45 | [Download](https://qaihub-public-assets.s3.us-west-2.amazonaws.com/qai-hub-models/models/stable_diffusion_v2_1/releases/v0.51.0/stable_diffusion_v2_1-qnn_context_binary-w8a16-qualcomm_sa8775p.zip)
| QNN_CONTEXT_BINARY | w8a16 | Snapdragon® 8 Elite For Galaxy Mobile | QAIRT 2.45 | [Download](https://qaihub-public-assets.s3.us-west-2.amazonaws.com/qai-hub-models/models/stable_diffusion_v2_1/releases/v0.51.0/stable_diffusion_v2_1-qnn_context_binary-w8a16-qualcomm_snapdragon_8_elite_for_galaxy.zip)
| QNN_CONTEXT_BINARY | w8a16 | Snapdragon® 7 Gen 4 Mobile | QAIRT 2.45 | [Download](https://qaihub-public-assets.s3.us-west-2.amazonaws.com/qai-hub-models/models/stable_diffusion_v2_1/releases/v0.51.0/stable_diffusion_v2_1-qnn_context_binary-w8a16-qualcomm_snapdragon_7gen4.zip)
| QNN_CONTEXT_BINARY | w8a16 | Qualcomm® SA7255P | QAIRT 2.45 | [Download](https://qaihub-public-assets.s3.us-west-2.amazonaws.com/qai-hub-models/models/stable_diffusion_v2_1/releases/v0.51.0/stable_diffusion_v2_1-qnn_context_binary-w8a16-qualcomm_sa7255p.zip)
| QNN_CONTEXT_BINARY | w8a16 | Qualcomm® QCM6690 | QAIRT 2.45 | [Download](https://qaihub-public-assets.s3.us-west-2.amazonaws.com/qai-hub-models/models/stable_diffusion_v2_1/releases/v0.51.0/stable_diffusion_v2_1-qnn_context_binary-w8a16-qualcomm_qcm6690.zip)
| QNN_CONTEXT_BINARY | w8a16 | Qualcomm® QCS9075 | QAIRT 2.45 | [Download](https://qaihub-public-assets.s3.us-west-2.amazonaws.com/qai-hub-models/models/stable_diffusion_v2_1/releases/v0.51.0/stable_diffusion_v2_1-qnn_context_binary-w8a16-qualcomm_qcs9075.zip)

For more device-specific assets and performance metrics, visit **[Stable-Diffusion-v2.1 on Qualcomm® AI Hub](https://aihub.qualcomm.com/models/stable_diffusion_v2_1)**.


### Option 2: Export with Custom Configurations

Use the [Qualcomm® AI Hub Models](https://github.com/qualcomm/ai-hub-models/blob/main/src/qai_hub_models/models/stable_diffusion_v2_1) Python library to compile and export the model with your own:
- Custom weights (e.g., fine-tuned checkpoints)
- Custom input shapes
- Target device and runtime configurations

This option is ideal if you need to customize the model beyond the default configuration provided here.

See our repository for [Stable-Diffusion-v2.1 on GitHub](https://github.com/qualcomm/ai-hub-models/blob/main/src/qai_hub_models/models/stable_diffusion_v2_1) for usage instructions.

## Model Details

**Model Type:** Model_use_case.image_generation

**Model Stats:**
- Input: Text prompt to generate image

## Performance Summary
| Model | Runtime | Precision | Chipset | Inference Time (ms) | Peak Memory Range (MB) | Primary Compute Unit
|---|---|---|---|---|---|---
| text_encoder | PRECOMPILED_QNN_ONNX | w8a16 | Snapdragon® 8 Elite Gen 5 Mobile | 4.599 ms | 0 - 10 MB | NPU
| text_encoder | PRECOMPILED_QNN_ONNX | w8a16 | Snapdragon® X2 Elite | 3.218 ms | 417 - 417 MB | NPU
| text_encoder | PRECOMPILED_QNN_ONNX | w8a16 | Snapdragon® X Elite | 7.713 ms | 418 - 418 MB | NPU
| text_encoder | PRECOMPILED_QNN_ONNX | w8a16 | Snapdragon® 8 Gen 3 Mobile | 6.019 ms | 0 - 12 MB | NPU
| text_encoder | PRECOMPILED_QNN_ONNX | w8a16 | Qualcomm® QCS8550 (Proxy) | 8.04 ms | 0 - 449 MB | NPU
| text_encoder | PRECOMPILED_QNN_ONNX | w8a16 | Qualcomm® QCS9075 | 7.4 ms | 0 - 3 MB | NPU
| text_encoder | PRECOMPILED_QNN_ONNX | w8a16 | Qualcomm® QCM6690 | 82.08 ms | 0 - 11 MB | NPU
| text_encoder | PRECOMPILED_QNN_ONNX | w8a16 | Snapdragon® 8 Elite For Galaxy Mobile | 5.06 ms | 0 - 12 MB | NPU
| text_encoder | PRECOMPILED_QNN_ONNX | w8a16 | Snapdragon® 7 Gen 4 Mobile | 12.021 ms | 0 - 10 MB | NPU
| text_encoder | QNN_CONTEXT_BINARY | w8a16 | Snapdragon® 8 Elite Gen 5 Mobile | 4.829 ms | 0 - 10 MB | NPU
| text_encoder | QNN_CONTEXT_BINARY | w8a16 | Snapdragon® X2 Elite | 4.187 ms | 0 - 0 MB | NPU
| text_encoder | QNN_CONTEXT_BINARY | w8a16 | Snapdragon® X Elite | 7.841 ms | 0 - 0 MB | NPU
| text_encoder | QNN_CONTEXT_BINARY | w8a16 | Snapdragon® 8 Gen 3 Mobile | 5.754 ms | 0 - 8 MB | NPU
| text_encoder | QNN_CONTEXT_BINARY | w8a16 | Qualcomm® QCS8275 (Proxy) | 17.374 ms | 0 - 8 MB | NPU
| text_encoder | QNN_CONTEXT_BINARY | w8a16 | Qualcomm® QCS8550 (Proxy) | 8.134 ms | 1 - 2 MB | NPU
| text_encoder | QNN_CONTEXT_BINARY | w8a16 | Qualcomm® SA8775P | 8.366 ms | 0 - 8 MB | NPU
| text_encoder | QNN_CONTEXT_BINARY | w8a16 | Qualcomm® QCS9075 | 8.045 ms | 0 - 2 MB | NPU
| text_encoder | QNN_CONTEXT_BINARY | w8a16 | Qualcomm® QCM6690 | 82.919 ms | 0 - 6 MB | NPU
| text_encoder | QNN_CONTEXT_BINARY | w8a16 | Qualcomm® SA7255P | 17.374 ms | 0 - 8 MB | NPU
| text_encoder | QNN_CONTEXT_BINARY | w8a16 | Snapdragon® 8 Elite For Galaxy Mobile | 4.922 ms | 0 - 9 MB | NPU
| text_encoder | QNN_CONTEXT_BINARY | w8a16 | Snapdragon® 7 Gen 4 Mobile | 12.124 ms | 1 - 7 MB | NPU
| unet | PRECOMPILED_QNN_ONNX | w8a16 | Snapdragon® 8 Elite Gen 5 Mobile | 70.927 ms | 0 - 9 MB | NPU
| unet | PRECOMPILED_QNN_ONNX | w8a16 | Snapdragon® X2 Elite | 66.191 ms | 845 - 845 MB | NPU
| unet | PRECOMPILED_QNN_ONNX | w8a16 | Snapdragon® X Elite | 157.732 ms | 842 - 842 MB | NPU
| unet | PRECOMPILED_QNN_ONNX | w8a16 | Snapdragon® 8 Gen 3 Mobile | 111.128 ms | 0 - 11 MB | NPU
| unet | PRECOMPILED_QNN_ONNX | w8a16 | Qualcomm® QCS8550 (Proxy) | 153.824 ms | 0 - 897 MB | NPU
| unet | PRECOMPILED_QNN_ONNX | w8a16 | Qualcomm® QCS9075 | 148.423 ms | 0 - 3 MB | NPU
| unet | PRECOMPILED_QNN_ONNX | w8a16 | Qualcomm® QCM6690 | 2412.561 ms | 0 - 11 MB | NPU
| unet | PRECOMPILED_QNN_ONNX | w8a16 | Snapdragon® 8 Elite For Galaxy Mobile | 100.957 ms | 0 - 11 MB | NPU
| unet | PRECOMPILED_QNN_ONNX | w8a16 | Snapdragon® 7 Gen 4 Mobile | 216.799 ms | 0 - 11 MB | NPU
| unet | QNN_CONTEXT_BINARY | w8a16 | Snapdragon® 8 Elite Gen 5 Mobile | 64.788 ms | 0 - 9 MB | NPU
| unet | QNN_CONTEXT_BINARY | w8a16 | Snapdragon® X2 Elite | 67.595 ms | 0 - 0 MB | NPU
| unet | QNN_CONTEXT_BINARY | w8a16 | Snapdragon® X Elite | 157.523 ms | 0 - 0 MB | NPU
| unet | QNN_CONTEXT_BINARY | w8a16 | Snapdragon® 8 Gen 3 Mobile | 109.836 ms | 0 - 8 MB | NPU
| unet | QNN_CONTEXT_BINARY | w8a16 | Qualcomm® QCS8275 (Proxy) | 346.003 ms | 0 - 7 MB | NPU
| unet | QNN_CONTEXT_BINARY | w8a16 | Qualcomm® QCS8550 (Proxy) | 152.738 ms | 0 - 2 MB | NPU
| unet | QNN_CONTEXT_BINARY | w8a16 | Qualcomm® SA8775P | 147.856 ms | 0 - 8 MB | NPU
| unet | QNN_CONTEXT_BINARY | w8a16 | Qualcomm® QCS9075 | 147.177 ms | 0 - 2 MB | NPU
| unet | QNN_CONTEXT_BINARY | w8a16 | Qualcomm® QCM6690 | 2468.005 ms | 0 - 10 MB | NPU
| unet | QNN_CONTEXT_BINARY | w8a16 | Qualcomm® SA7255P | 346.003 ms | 0 - 7 MB | NPU
| unet | QNN_CONTEXT_BINARY | w8a16 | Snapdragon® 8 Elite For Galaxy Mobile | 99.957 ms | 0 - 13 MB | NPU
| unet | QNN_CONTEXT_BINARY | w8a16 | Snapdragon® 7 Gen 4 Mobile | 213.566 ms | 0 - 7 MB | NPU
| vae | PRECOMPILED_QNN_ONNX | w8a16 | Snapdragon® 8 Elite Gen 5 Mobile | 132.639 ms | 3 - 13 MB | NPU
| vae | PRECOMPILED_QNN_ONNX | w8a16 | Snapdragon® X2 Elite | 144.688 ms | 63 - 63 MB | NPU
| vae | PRECOMPILED_QNN_ONNX | w8a16 | Snapdragon® X Elite | 260.23 ms | 64 - 64 MB | NPU
| vae | PRECOMPILED_QNN_ONNX | w8a16 | Snapdragon® 8 Gen 3 Mobile | 200.01 ms | 3 - 10 MB | NPU
| vae | PRECOMPILED_QNN_ONNX | w8a16 | Qualcomm® QCS8550 (Proxy) | 262.127 ms | 0 - 65 MB | NPU
| vae | PRECOMPILED_QNN_ONNX | w8a16 | Qualcomm® QCS9075 | 246.199 ms | 3 - 6 MB | NPU
| vae | PRECOMPILED_QNN_ONNX | w8a16 | Qualcomm® QCM6690 | 6213.647 ms | 0 - 6 MB | NPU
| vae | PRECOMPILED_QNN_ONNX | w8a16 | Snapdragon® 8 Elite For Galaxy Mobile | 171.805 ms | 3 - 15 MB | NPU
| vae | PRECOMPILED_QNN_ONNX | w8a16 | Snapdragon® 7 Gen 4 Mobile | 507.911 ms | 2 - 9 MB | NPU
| vae | QNN_CONTEXT_BINARY | w8a16 | Snapdragon® 8 Elite Gen 5 Mobile | 123.132 ms | 0 - 9 MB | NPU
| vae | QNN_CONTEXT_BINARY | w8a16 | Snapdragon® X2 Elite | 128.959 ms | 0 - 0 MB | NPU
| vae | QNN_CONTEXT_BINARY | w8a16 | Snapdragon® X Elite | 257.612 ms | 0 - 0 MB | NPU
| vae | QNN_CONTEXT_BINARY | w8a16 | Snapdragon® 8 Gen 3 Mobile | 195.277 ms | 0 - 7 MB | NPU
| vae | QNN_CONTEXT_BINARY | w8a16 | Qualcomm® QCS8275 (Proxy) | 713.296 ms | 0 - 9 MB | NPU
| vae | QNN_CONTEXT_BINARY | w8a16 | Qualcomm® QCS8550 (Proxy) | 260.689 ms | 0 - 2 MB | NPU
| vae | QNN_CONTEXT_BINARY | w8a16 | Qualcomm® SA8775P | 244.5 ms | 0 - 9 MB | NPU
| vae | QNN_CONTEXT_BINARY | w8a16 | Qualcomm® QCS9075 | 242.058 ms | 0 - 3 MB | NPU
| vae | QNN_CONTEXT_BINARY | w8a16 | Qualcomm® QCM6690 | 6119.655 ms | 0 - 7 MB | NPU
| vae | QNN_CONTEXT_BINARY | w8a16 | Qualcomm® SA7255P | 713.296 ms | 0 - 9 MB | NPU
| vae | QNN_CONTEXT_BINARY | w8a16 | Snapdragon® 8 Elite For Galaxy Mobile | 158.943 ms | 0 - 9 MB | NPU
| vae | QNN_CONTEXT_BINARY | w8a16 | Snapdragon® 7 Gen 4 Mobile | 502.972 ms | 0 - 7 MB | NPU

## License
* The license for the original implementation of Stable-Diffusion-v2.1 can be found
  [here](https://github.com/CompVis/stable-diffusion/blob/main/LICENSE).

## References
* [High-Resolution Image Synthesis with Latent Diffusion Models](https://arxiv.org/abs/2112.10752)
* [Source Model Implementation](https://github.com/CompVis/stable-diffusion/tree/main)

## Community
* Join [our AI Hub Slack community](https://aihub.qualcomm.com/community/slack) to collaborate, post questions and learn more about on-device AI.
* For questions or feedback please [reach out to us](mailto:ai-hub-support@qti.qualcomm.com).

## Usage and Limitations

This model may not be used for or in connection with any of the following applications:

- Accessing essential private and public services and benefits;
- Administration of justice and democratic processes;
- Assessing or recognizing the emotional state of a person;
- Biometric and biometrics-based systems, including categorization of persons based on sensitive characteristics;
- Education and vocational training;
- Employment and workers management;
- Exploitation of the vulnerabilities of persons resulting in harmful behavior;
- General purpose social scoring;
- Law enforcement;
- Management and operation of critical infrastructure;
- Migration, asylum and border control management;
- Predictive policing;
- Real-time remote biometric identification in public spaces;
- Recommender systems of social media platforms;
- Scraping of facial images (from the internet or otherwise); and/or
- Subliminal manipulation