**ExecuTorch** is PyTorch's unified solution for deploying AI models on-device—from smartphones to microcontrollers—built for privacy, performance, and portability. It powers Meta's on-device AI across **Instagram, WhatsApp, Quest 3, Ray-Ban Meta Smart Glasses**, and [more](https://docs.pytorch.org/executorch/main/success-stories.html).
Deploy **LLMs, vision, speech, and multimodal models** with the same PyTorch APIs you already know—accelerating research to production with seamless model export, optimization, and deployment. No manual C++ rewrites. No format conversions. No vendor lock-in.
📘 Table of Contents
- [Why ExecuTorch?](#why-executorch)
- [How It Works](#how-it-works)
- [Quick Start](#quick-start)
- [Installation](#installation)
- [Export and Deploy in 3 Steps](#export-and-deploy-in-3-steps)
- [Run on Device](#run-on-device)
- [LLM Example: Llama](#llm-example-llama)
- [Platform & Hardware Support](#platform--hardware-support)
- [Production Deployments](#production-deployments)
- [Examples & Models](#examples--models)
- [Key Features](#key-features)
- [Documentation](#documentation)
- [Community & Contributing](#community--contributing)
- [License](#license)
## Why ExecuTorch?
- **🔒 Native PyTorch Export** — Direct export from PyTorch. No .onnx, .tflite, or intermediate format conversions. Preserve model semantics.
- **⚡ Production-Proven** — Powers billions of users at [Meta with real-time on-device inference](https://engineering.fb.com/2025/07/28/android/executorch-on-device-ml-meta-family-of-apps/).
- **💾 Tiny Runtime** — 50KB base footprint. Runs on microcontrollers to high-end smartphones.
- **🚀 [12+ Hardware Backends](https://docs.pytorch.org/executorch/main/backends-overview.html)** — Open-source acceleration for Apple, Samsung, Qualcomm, ARM, MediaTek, Vulkan, and more.
- **🎯 One Export, Multiple Backends** — Switch hardware targets with a single line change. Deploy the same model everywhere.
## How It Works
ExecuTorch uses **ahead-of-time (AOT) compilation** to prepare PyTorch models for edge deployment:
1. **🧩 Export** — Capture your PyTorch model graph with `torch.export()`
2. **⚙️ Compile** — Quantize, optimize, and partition to hardware backends → `.pte`
3. **🚀 Execute** — Load `.pte` on-device via lightweight C++ runtime
Models use a standardized [Core ATen operator set](https://docs.pytorch.org/executorch/main/compiler-ir-advanced.html#intermediate-representation). [Partitioners](https://docs.pytorch.org/executorch/main/compiler-delegate-and-partitioner.html) delegate subgraphs to specialized hardware (NPU/GPU) with CPU fallback.
Learn more: [How ExecuTorch Works](https://docs.pytorch.org/executorch/main/intro-how-it-works.html) • [Architecture Guide](https://docs.pytorch.org/executorch/main/getting-started-architecture.html)
## Quick Start
### Installation
```bash
pip install executorch
```
For platform-specific setup (Android, iOS, embedded systems), see the [Quick Start](https://docs.pytorch.org/executorch/main/quick-start-section.html) documentation for additional info.
### Export and Deploy in 3 Steps
```python
import torch
from executorch.exir import to_edge_transform_and_lower
from executorch.backends.xnnpack.partition.xnnpack_partitioner import XnnpackPartitioner
# 1. Export your PyTorch model
model = MyModel().eval()
example_inputs = (torch.randn(1, 3, 224, 224),)
exported_program = torch.export.export(model, example_inputs)
# 2. Optimize for target hardware (switch backends with one line)
program = to_edge_transform_and_lower(
exported_program,
partitioner=[XnnpackPartitioner()] # CPU | CoreMLPartitioner() for iOS | QnnPartitioner() for Qualcomm
).to_executorch()
# 3. Save for deployment
with open("model.pte", "wb") as f:
f.write(program.buffer)
# Test locally via ExecuTorch runtime's pybind API (optional)
from executorch.runtime import Runtime
runtime = Runtime.get()
method = runtime.load_program("model.pte").load_method("forward")
outputs = method.execute([torch.randn(1, 3, 224, 224)])
```
### Run on Device
**[C++](https://docs.pytorch.org/executorch/main/using-executorch-cpp.html)**
```cpp
#include
#include
Module module("model.pte");
auto tensor = make_tensor_ptr({2, 2}, {1.0f, 2.0f, 3.0f, 4.0f});
auto outputs = module.forward(tensor);
```
**[Swift (iOS)](https://docs.pytorch.org/executorch/main/ios-section.html)**
```swift
import ExecuTorch
let module = Module(filePath: "model.pte")
let input = Tensor([1.0, 2.0, 3.0, 4.0], shape: [2, 2])
let outputs = try module.forward(input)
```
**[Kotlin (Android)](https://docs.pytorch.org/executorch/main/android-section.html)**
```kotlin
val module = Module.load("model.pte")
val inputTensor = Tensor.fromBlob(floatArrayOf(1.0f, 2.0f, 3.0f, 4.0f), longArrayOf(2, 2))
val outputs = module.forward(EValue.from(inputTensor))
```
### LLM Example: Llama
Export Llama models using the [`export_llm`](https://docs.pytorch.org/executorch/main/llm/export-llm.html) script or [Optimum-ExecuTorch](https://github.com/huggingface/optimum-executorch):
```bash
# Using export_llm
python -m executorch.extension.llm.export.export_llm --model llama3_2 --output llama.pte
# Using Optimum-ExecuTorch
optimum-cli export executorch \
--model meta-llama/Llama-3.2-1B \
--task text-generation \
--recipe xnnpack \
--output_dir llama_model
```
Run on-device with the LLM runner API:
**[C++](https://docs.pytorch.org/executorch/main/llm/run-with-c-plus-plus.html)**
```cpp
#include
auto runner = create_llama_runner("llama.pte", "tiktoken.bin");
executorch::extension::llm::GenerationConfig config{
.seq_len = 128, .temperature = 0.8f};
runner->generate("Hello, how are you?", config);
```
**[Swift (iOS)](https://docs.pytorch.org/executorch/main/llm/run-on-ios.html)**
```swift
import ExecuTorchLLM
let runner = TextRunner(modelPath: "llama.pte", tokenizerPath: "tiktoken.bin")
try runner.generate("Hello, how are you?", Config {
$0.sequenceLength = 128
}) { token in
print(token, terminator: "")
}
```
**Kotlin (Android)** — [API Docs](https://docs.pytorch.org/executorch/main/javadoc/org/pytorch/executorch/extension/llm/package-summary.html) • [Demo App](https://github.com/meta-pytorch/executorch-examples/tree/main/llm/android/LlamaDemo)
```kotlin
val llmModule = LlmModule("llama.pte", "tiktoken.bin", 0.8f)
llmModule.load()
llmModule.generate("Hello, how are you?", 128, object : LlmCallback {
override fun onResult(result: String) { print(result) }
override fun onStats(stats: String) { }
})
```
For multimodal models (vision, audio), use the [MultiModal runner API](extension/llm/runner) which extends the LLM runner to handle image and audio inputs alongside text. See [Llava](examples/models/llava/README.md) and [Voxtral](examples/models/voxtral/README.md) examples.
See [examples/models/llama](examples/models/llama/README.md) for complete workflow including quantization, mobile deployment, and advanced options.
**Next Steps:**
- 📖 [Step-by-step tutorial](https://docs.pytorch.org/executorch/main/getting-started.html) — Complete walkthrough for your first model
- ⚡ [Colab notebook](https://colab.research.google.com/drive/1qpxrXC3YdJQzly3mRg-4ayYiOjC6rue3?usp=sharing) — Try ExecuTorch instantly in your browser
- 🤖 [Deploy Llama models](examples/models/llama/README.md) — LLM workflow with quantization and mobile demos
## Platform & Hardware Support
| **Platform** | **Supported Backends** |
|------------------|----------------------------------------------------------|
| Android | XNNPACK, Vulkan, Qualcomm, MediaTek, Samsung Exynos |
| iOS | XNNPACK, CoreML (Neural Engine), MPS *(deprecated)* |
| Linux / Windows | XNNPACK, OpenVINO, CUDA *(experimental)* |
| macOS | XNNPACK, Metal *(experimental)*, MPS *(deprecated)* |
| Embedded / MCU | XNNPACK, ARM Ethos-U, NXP, Cadence DSP |
See [Backend Documentation](https://docs.pytorch.org/executorch/main/backends-overview.html) for detailed hardware requirements and optimization guides. For desktop/laptop GPU inference with CUDA and Metal, see the [Desktop Guide](desktop/README.md). For Zephyr RTOS integration, see the [Zephyr Guide](zephyr/README.md).
## Production Deployments
ExecuTorch powers on-device AI at scale across Meta's family of apps, VR/AR devices, and partner deployments. [View success stories →](https://docs.pytorch.org/executorch/main/success-stories.html)
## Examples & Models
**LLMs:** [Llama 3.2/3.1/3](examples/models/llama/README.md), [Qwen 3](examples/models/qwen3/README.md), [Phi-4-mini](examples/models/phi_4_mini/README.md), [LiquidAI LFM2](examples/models/lfm2/README.md)
**Multimodal:** [Llava](examples/models/llava/README.md) (vision-language), [Voxtral](examples/models/voxtral/README.md) (audio-language), [Gemma](examples/models/gemma3) (vision-language)
**Vision/Speech:** [MobileNetV2](https://github.com/meta-pytorch/executorch-examples/tree/main/mv2), [DeepLabV3](https://github.com/meta-pytorch/executorch-examples/tree/main/dl3), [YOLO26](examples/models/yolo26/README.md), [Whisper](examples/models/whisper/README.md)
**Resources:** [`examples/`](examples/) directory • [executorch-examples](https://github.com/meta-pytorch/executorch-examples) out-of-tree demos • [Optimum-ExecuTorch](https://github.com/huggingface/optimum-executorch) for HuggingFace models • [Unsloth](https://docs.unsloth.ai/new/deploy-llms-phone) for fine-tuned LLM deployment
## Key Features
ExecuTorch provides advanced capabilities for production deployment:
- **Quantization** — Built-in support via [torchao](https://docs.pytorch.org/ao) for 8-bit, 4-bit, and dynamic quantization
- **Memory Planning** — Optimize memory usage with ahead-of-time allocation strategies
- **Developer Tools** — ETDump profiler, ETRecord inspector, and model debugger
- **Selective Build** — Strip unused operators to minimize binary size
- **Custom Operators** — Extend with domain-specific kernels
- **Dynamic Shapes** — Support variable input sizes with bounded ranges
See [Advanced Topics](https://docs.pytorch.org/executorch/main/advanced-topics-section.html) for quantization techniques, custom backends, and compiler passes.
## Documentation
- [**Documentation Home**](https://docs.pytorch.org/executorch/main/index.html) — Complete guides and tutorials
- [**API Reference**](https://docs.pytorch.org/executorch/main/api-section.html) — Python, C++, Java/Kotlin APIs
- [**Backend Integration**](https://docs.pytorch.org/executorch/main/backend-delegates-integration.html) — Build custom hardware backends
- [**Troubleshooting**](https://docs.pytorch.org/executorch/main/support-section.html) — Common issues and solutions
## Community & Contributing
We welcome contributions from the community!
- 💬 [**GitHub Discussions**](https://github.com/pytorch/executorch/discussions) — Ask questions and share ideas
- 🎮 [**Discord**](https://discord.gg/Dh43CKSAdc) — Chat with the team and community
- 🐛 [**Issues**](https://github.com/pytorch/executorch/issues) — Report bugs or request features
- 🤝 [**Contributing Guide**](CONTRIBUTING.md) — Guidelines and codebase structure
## Citing ExecuTorch
If you found ExecuTorch helpful in your research and would like to acknowledge it, please cite us using the following BibTeX:
```bibtex
@article{executorch2026,
title={{ExecuTorch} - A Unified {PyTorch} Solution to Run {AI} Models On-Device},
author={Nachin, Mergen and Desai, Digant and Jia, Sicheng Stephen and Lai, Chen and Liu, Mengwei and Szwejbka, Jacob and Alvarez, Raziel and Ascani, RJ and Bort, Dave and Candales, Manuel and
others},
journal={arXiv preprint arXiv:2605.08195},
url={https://github.com/pytorch/executorch},
year={2026}
}
```
## License
ExecuTorch is BSD licensed, as found in the [LICENSE](LICENSE) file.
