PT to ONNX Converter

A web-based tool to convert PyTorch PT models to ONNX for data scientists and developers needing interoperable AI models.

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About This Tool

This tool provides an online workflow to convert PyTorch models saved in .pt or .pth into ONNX format, enabling deployment across runtime environments such as ONNX Runtime, TensorRT, or other inference backends. It targets ML engineers, AI researchers, and deployment engineers who need framework interoperability and optimized inference paths. The converter focuses on preserving model structure, weights, and input/output semantics during export. Core logic loads the PT model, optionally scripts or traces the model, and calls torch.onnx.export with user-specified options. It supports selecting an ONNX opset_version, dynamic_axes, and explicit input_names/output_names. After export, it runs a lightweight validation to ensure the ONNX graph is well-formed and that basic shape/type consistency holds. When unsupported operators are encountered, the tool reports diagnostics and suggests adjustments or an alternative export path. Audience benefits include faster cross-framework deployment, easier experimentation with backend accelerators, and a centralized workflow for validation. The system emphasizes transparency in export decisions and provides clear failure reasons, enabling iterative improvements. Core features include: PT input support (.pt/.pth), optional scripting or tracing, configurable opset_version, dynamic_axes, input/output naming, post-export validation, and a lightweight compatibility report. Use cases cover production deployment, model prototyping across platforms, and edge deployment prep.

How to Use

  1. Upload a PyTorch model file (.pt/.pth).
  2. Set options: opset_version, dynamic_axes, and input/output names as needed.
  3. Run export to generate ONNX.
  4. Validate: download and test with a sample input in ONNX Runtime.
  5. Download the ONNX model and validation report.
How to use pt to onnx converter online

Frequently Asked Questions

Find Quick Answers

What input formats are supported?
The tool accepts PyTorch models saved as .pt or .pth. ONNX export is produced as the result and can be consumed by ONNX-compatible runtimes.
Can dynamic axes be used during export?
Yes. Dynamic axes allow flexible batch sizes and sequence lengths. You can enable dynamic_axes and specify which inputs or axes are dynamic to preserve runtime flexibility.
What if export fails due to operators?
Export may fail if the PyTorch model uses operators not available in the selected ONNX opset. The tool provides diagnostics, recommends a compatible opset_version, or suggests simplifying the model.
Is model data retained after conversion?
The model is processed in-session and not retained beyond the current workflow. Users should manage data lifecycle according to privacy and security policies.

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