PaddleOCR 3.5: Running OCR and Document Parsing Tasks with a Transformers Backend

Source: Hugging Face Blog

Authors

What changed?

PaddleOCR 3.5 introduces a more flexible inference‑engine interface. Developers can select the backend through the engine parameter and pass backend‑specific options through engine_config.

In practice, this means:

• The pipelines behind these tasks are managed by PaddleOCR, so developers do not need to manually call each internal component.
• Transformers becomes one of the supported inference back‑ends for running supported PaddleOCR models.
• Developers can configure backend‑related options such as dtype, device placement, and attention implementation through engine_config.

Stack overview

This release mainly touches the inference backend layer: PaddleOCR continues to provide OCR and document‑parsing capabilities, while Transformers adds another backend option that fits naturally into Hugging Face‑centered environments. The larger Document AI workflow remains in the hands of developers and application builders.

Why this matters

For RAG, Document AI, and document‑agent applications, the hard part often starts before the LLM.

Developers first need to turn PDFs, scanned documents, screenshots, tables, charts, formulas, and complex page layouts into reliable structured data. If this ingestion step is weak, the downstream LLM workflow may miss key information, retrieve the wrong context, or produce unreliable answers.

PaddleOCR helps address this ingestion challenge by providing OCR series models such as PP‑OCRv5 and document‑parsing series models such as PaddleOCR‑VL‑1.5.

With PaddleOCR 3.5, these capabilities are now easier to connect with Transformers‑centered stacks. Supported PaddleOCR models can run with a Transformers backend, while PaddleOCR continues to manage the OCR or document‑parsing pipeline behind the scenes.

For developers, this means less integration friction and a more natural path from documents to downstream RAG, agent, search, analytics, or automation workflows.

Quick start

Install

# CUDA 12.6 example
python -m pip install torch torchvision torchaudio \
    --index-url https://download.pytorch.org/whl/cu126

python -m pip install "paddleocr==3.5.0" "paddlex==3.5.2" "transformers>=5.4.0"

For CPU, ROCm, or other environments, install the PyTorch build that matches your target hardware.

Command‑line usage

paddleocr ocr \
  -i https://paddle-model-ecology.bj.bcebos.com/paddlex/imgs/demo_image/general_ocr_002.png \
  --device gpu:0 \
  --engine transformers

Python API

from paddleocr import PaddleOCR

pipeline = PaddleOCR(
    device="gpu:0",
    engine="transformers",
    use_doc_orientation_classify=False,
    use_doc_unwarping=False,
    use_textline_orientation=False,
    engine_config={"dtype": "float32"},
)

results = pipeline.predict(
    "https://paddle-model-ecology.bj.bcebos.com/paddlex/imgs/demo_image/general_ocr_002.png"
)

for result in results:
    print(result)

The Hugging Face Space uses float32 for broad compatibility. For your own hardware, you can tune backend‑specific options through engine_config:

engine_config = {
    "dtype": "bfloat16",
    "device_type": "gpu",
    "device_id": 0,
    "attn_implementation": "sdpa",
}

The best configuration depends on your model, hardware, and deployment environment.

When should you use the Transformers backend?

Use the Transformers backend when you want PaddleOCR’s OCR and document‑parsing capabilities to fit more naturally into a Hugging Face‑centered stack.

This is especially useful if you are building RAG, Document AI, search, analytics, or agent applications and already rely on PyTorch / Transformers infrastructure for model loading, experimentation, deployment, or model‑artifact management.

The Transformers backend is a good fit when you want:

• A more familiar development experience for teams already using Transformers.
• Hub‑compatible model discovery and distribution for supported PaddleOCR models.
• Easier integration with existing PyTorch / Transformers services.

When maximizing OCR or document‑parsing throughput is the priority, PaddleOCR’s … (the original text cuts off here).

The default paddle_static backend is usually the recommended choice.

This release is not about replacing one backend with another.
It is about giving developers more flexibility: use PaddleOCR for OCR and document‑parsing capabilities, and choose the inference backend that best fits your stack.

Try it now

Demo on Hugging Face Spaces
▶️ PaddleOCR 3.5 Transformers demo

Explore PaddleOCR models on the Hub
📦 PaddleOCR models

PaddleOCR 3.5 brings OCR and document‑parsing capabilities closer to Transformers‑centered workflows, while giving developers the freedom to build larger Document AI applications around them.

Resources

• Documentation –
• GitHub repository –
• PaddlePaddle organization on Hugging Face –
• Transformers demo on Spaces –

Acknowledgements

We sincerely thank the Hugging Face engineers who supported the PaddleOCR 3.5 Transformers integration.

Special thanks to Anton Vlasjuk for his end‑to‑end involvement, including reviewing and merging all related pull requests.

We also appreciate Raushan Turganbay and Yoni Gozlan for their valuable PR reviews and feedback.

Their guidance helped improve the integration quality, documentation, and developer experience for the Hugging Face community.