2025 Complete Guide: How to Build End-to-End OCR with HunyuanOCR

🎯 Key Takeaways (TL;DR)

• A single 1B multimodal architecture covers detection, recognition, parsing, translation, and more in one unified OCR pipeline.
• Dual inference paths (vLLM + Transformers) plus well-crafted prompts make rapid production deployment straightforward.
• In-house benchmarks show consistent gains over traditional OCR and general-purpose VLMs across spotting, document parsing, and information extraction.

Table of Contents

1. What Is HunyuanOCR?
2. Why Is HunyuanOCR So Strong?
3. How to Deploy HunyuanOCR Quickly?
4. How to Design Business-Ready Prompts?
5. What Performance Evidence Exists?
6. How Does the Inference Flow Work?
7. FAQ
8. Summary & Action Plan

What Is HunyuanOCR?

HunyuanOCR is Tencent Hunyuan’s end-to-end OCR-specific vision-language model (VLM). Built on a native multimodal architecture with only 1B parameters, it reaches state-of-the-art results on text spotting, complex document parsing, open-field information extraction, subtitle extraction, and image translation.

✅ Best Practice

Whenever you must process multilingual, multimodal, and complex layouts in one shot, prioritize an “single-prompt + single-inference” end-to-end model to cut pipeline latency drastically.

Why Is HunyuanOCR So Strong?

Lightweight, Full-Modal Coverage

• 1B native multimodal design: achieves SOTA quality with self-developed training strategy while keeping inference cost low.
• Task completeness: detection, recognition, parsing, info extraction, subtitles, and translation all handled within one model.
• Language breadth: supports 100+ languages across documents, street views, handwriting, tickets, etc.

True End-to-End Experience

• Single prompt → single inference: avoids cascading OCR error accumulation.
• Flexible output: coordinates, LaTeX, HTML, Mermaid, Markdown, JSON—choose whatever structure you need.
• Video-friendly: extracts bilingual subtitles directly for downstream translation or editing.

💡 Pro Tip

Tailor prompts to your business format (HTML tables, JSON fields, bilingual subtitles) to unleash structured outputs from the end-to-end pipeline.

How to Deploy HunyuanOCR Quickly?

System Requirements

• OS: Linux
• Python: 3.12+
• CUDA: 12.8
• PyTorch: 2.7.1
• GPU: NVIDIA CUDA GPU with 80GB memory
• Disk: 6GB

vLLM Deployment (Recommended)

1. pip install vllm --extra-index-url https://wheels.vllm.ai/nightly
2. Load tencent/HunyuanOCR plus AutoProcessor.
3. Build messages containing image + instruction, then call apply_chat_template for the prompt.
4. Configure SamplingParams(temperature=0, max_tokens=16384).
5. Invoke llm.generate and run post-processing (e.g., clean_repeated_substrings).

Transformers Deployment

1. Install the pinned branch: pip install git+https://github.com/huggingface/transformers@82a06d...
2. Use HunYuanVLForConditionalGeneration with AutoProcessor.
3. Call model.generate(..., max_new_tokens=16384, do_sample=False).
4. Note: This path currently trails vLLM in performance (official fix in progress).

⚠️ Heads-up

README scripts default to bfloat16 and device_map="auto". In multi-GPU setups, ensure memory sharding is deliberate to avoid distributed OOM.

How to Design Business-Ready Prompts?

Task Prompt Cheat Sheet

Prompting Principles

1. Structure first: explicitly request JSON/HTML/Markdown to reduce post-processing.
2. Field enumeration: list all keys for information extraction to avoid missing items.
3. Language constraints: specify target language for translation/subtitle tasks.
4. Redundancy cleanup: apply substring dedupe helpers on long outputs.

What Performance Evidence Exists?

Text Spotting & Recognition (In-house Benchmark)

Document Parsing (OmniDocBench + Multilingual Benchmarks)

Information Extraction & VQA

Image Translation

💡 Pro Tip

For multilingual invoices, IDs, or subtitles, HunyuanOCR’s leadership on Cards/Receipts/Subtitles makes it a strong first choice.

How Does the Inference Flow Work?

📊 Implementation Flow

graph TD
    A[Prepare environment & deps] --> B[Download tencent/HunyuanOCR]
    B --> C[Build prompts + multimodal inputs]
    C --> D[Run vLLM or Transformers inference]
    D --> E[Apply formatting / dedup post-processing]
    E --> F[Deploy into business workflows]

✅ Best Practice

Add guardrails at the end (empty-output detection, JSON schema validation) to shield downstream systems from malformed results.

🤔 FAQ

Q: How much GPU memory is required?

A: 80GB is recommended for 16K-token decoding. For smaller GPUs, reduce max_tokens, downsample images, or enable tensor parallelism.

Q: What’s the gap between vLLM and Transformers?

A: vLLM delivers better throughput and latency today and is the preferred path. Transformers currently lags but is ideal for custom ops or debugging until the fix lands upstream.

Q: How do I guarantee structured outputs?

A: Define the exact schema in the prompt, validate responses (regex/JSON schema), and apply helper functions like clean_repeated_substrings from the README.

Summary & Action Plan

• For multilingual, multi-format OCR workloads, evaluate HunyuanOCR’s single-model pipeline first to cut architectural complexity.
• Start with the vLLM recipe for fast PoC using the provided prompts and scripts, then iterate on prompt engineering and post-processing to meet production specs.
• Dive deeper via the HunyuanOCR Technical Report, Hugging Face demo, or by reproducing the visual examples from the README.

References

• Official README & README_zh
• Hugging Face Demo: https://huggingface.co/spaces/tencent/HunyuanOCR
• Model download: https://huggingface.co/tencent/HunyuanOCR
• Technical report: HunyuanOCR_Technical_Report.pdf

HunyuanOCR Guide