OpenOCR

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OpenOCR is an open-source toolkit developed by the OCR team from FVL Lab, Fudan University, under the guidance of Prof. Yu-Gang Jiang and Prof. Zhineng Chen. It focuses on 「General-OCR」 tasks, including Text Detection and Recognition, Formula and Table Recognition, as well as Document Parsing and Understanding. The toolkit integrates a unified training and evaluation benchmark, commercial-grade OCR and Document Parsing systems, and faithful reproductions of the core implementations from a wide range of academic papers.

OpenOCR aims to build a comprehensive open-source ecosystem for General-OCR, bridging academic research and real-world applications, and fostering the collaborative development and widespread deployment of OCR technologies across both research frontiers and industrial scenarios. We welcome researchers, developers, and industry partners to explore the toolkit and share feedback.

🚀 Quick Start

Features

• 🔥OpenDoc-0.1B: Ultra-Lightweight Document Parsing System with 0.1B Parameters

  • ⚡[Quick Start] [Local Demo]

    • An ultra-lightweight document parsing system with only 0.1B parameters.
    • Two-stage pipeline:
      1. Layout analysis via PP-DocLayoutV2.
      2. Unified recognition of text, formulas, and tables using the in-house model UniRec-0.1B
         • In the original version of UniRec-0.1B, only text and formula recognition were supported. In OpenDoc-0.1B, we rebuilt UniRec-0.1B to enable unified recognition of text, formulas, and tables.
    • Supports document parsing for Chinese and English.
    • Achieves 90.57% on OmniDocBench (v1.5), outperforming many document parsing models based on multimodal large language models.

• 🔥UniRec-0.1B: Unified Text and Formula Recognition with 0.1B Parameters

  • [Doc] [Local Demo] [Hugging Face Model] [ModelScope Model] [UniRec40M Dataset]
    • Recognizing plain text (words, lines, paragraphs), formulas (single-line, multi-line), and mixed text-and-formulas content.
    • 0.1B parameters.
    • Trained from scratch on UniRec40M data without pre-training.
    • Supporting both Chinese and English text/formulas recognition.

• 🔥OpenOCR: A general OCR system with accuracy and efficiency

  • ⚡[Quick Start] [Local Demo] [Model] [PaddleOCR Implementation]
  • Introduction
    • A practical OCR system building on SVTRv2.
    • Outperforms PP-OCRv4 baseline by 4.5% on the OCR competition leaderboard in terms of accuracy, while preserving quite similar inference speed.
    • Supports Chinese and English text detection and recognition.
    • Provides server model and mobile model.
    • Fine-tunes OpenOCR on a custom dataset: Fine-tuning Det, Fine-tuning Rec.
    • ONNX model export for wider compatibility.

• 🔥SVTRv2: CTC Beats Encoder-Decoder Models in Scene Text Recognition (ICCV 2025)

  • [Doc] [Model] [Datasets] [Config, Training and Inference] [Benchmark]
  • Introduction
    • A unified training and evaluation benchmark (on top of Union14M) for Scene Text Recognition
    • Supports 24 Scene Text Recognition methods trained from scratch on the large-scale real dataset Union14M-L-Filter, and will continue to add the latest methods.
    • Improves accuracy by 20-30% compared to models trained based on synthetic datasets.
    • Towards Arbitrary-Shaped Text Recognition and Language modeling with a Single Visual Model.
    • Surpasses Attention-based Encoder-Decoder Methods across challenging scenarios in terms of accuracy and speed
  • Get Started with training a SOTA Scene Text Recognition model from scratch.

Ours OCR algorithms

• ScriptMoE (Xingsong Ye, Yongkun Du, Jiaxin Zhang, Zhixian Li, Chong Sun, Chen Li, Jing Lyu, Lianwen Jin, Zhineng Chen*. All-in-One Multilingual Scene Text Recognition with Script-aware Mixture-of-Experts, Preprint. Doc, Code, Demo&Model)
• UniRec-0.1B (Yongkun Du, Zhineng Chen, Yazhen Xie, Weikang Bai, Hao Feng, Wei Shi, Yuchen Su, Can Huang, Yu-Gang Jiang. UniRec-0.1B: Unified Text and Formula Recognition with 0.1B Parameters, Preprint. Doc, Paper)
• MDiff4STR (Yongkun Du, Miaomiao Zhao, Songlin Fan, Zhineng Chen*, Caiyan Jia, Yu-Gang Jiang. MDiff4STR: Mask Diffusion Model for Scene Text Recognition, AAAI 2026 Oral. Doc, Paper)
• CMER (Weikang Bai, Yongkun Du, Yuchen Su, Yazhen Xie, Zhineng Chen*. Complex Mathematical Expression Recognition: Benchmark, Large-Scale Dataset and Strong Baseline, AAAI 2026. Doc, Paper)
• TextSSR (Xingsong Ye, Yongkun Du, Yunbo Tao, Zhineng Chen*. TextSSR: Diffusion-based Data Synthesis for Scene Text Recognition, ICCV 2025. Paper, Code)
• SVTRv2 (Yongkun Du, Zhineng Chen*, Hongtao Xie, Caiyan Jia, Yu-Gang Jiang. SVTRv2: CTC Beats Encoder-Decoder Models in Scene Text Recognition, ICCV 2025. Doc, Paper)
• IGTR (Yongkun Du, Zhineng Chen*, Yuchen Su, Caiyan Jia, Yu-Gang Jiang. Instruction-Guided Scene Text Recognition, TPAMI 2025. Doc, Paper)
• CPPD (Yongkun Du, Zhineng Chen*, Caiyan Jia, Xiaoting Yin, Chenxia Li, Yuning Du, Yu-Gang Jiang. Context Perception Parallel Decoder for Scene Text Recognition, TPAMI 2025. PaddleOCR Doc, Paper)
• SMTR&FocalSVTR (Yongkun Du, Zhineng Chen*, Caiyan Jia, Xieping Gao, Yu-Gang Jiang. Out of Length Text Recognition with Sub-String Matching, AAAI 2025. Doc, Paper)
• DPTR (Shuai Zhao, Yongkun Du, Zhineng Chen*, Yu-Gang Jiang. Decoder Pre-Training with only Text for Scene Text Recognition, ACM MM 2024. Paper)
• CDistNet (Tianlun Zheng, Zhineng Chen*, Shancheng Fang, Hongtao Xie, Yu-Gang Jiang. CDistNet: Perceiving Multi-Domain Character Distance for Robust Text Recognition, IJCV 2024. Paper)
• MRN (Tianlun Zheng, Zhineng Chen*, Bingchen Huang, Wei Zhang, Yu-Gang Jiang. MRN: Multiplexed Routing Network for Incremental Multilingual Text Recognition, ICCV 2023. Paper, Code)
• TPS++ (Tianlun Zheng, Zhineng Chen*, Jinfeng Bai, Hongtao Xie, Yu-Gang Jiang. TPS++: Attention-Enhanced Thin-Plate Spline for Scene Text Recognition, IJCAI 2023. Paper, Code)
• SVTR (Yongkun Du, Zhineng Chen*, Caiyan Jia, Xiaoting Yin, Tianlun Zheng, Chenxia Li, Yuning Du, Yu-Gang Jiang. SVTR: Scene Text Recognition with a Single Visual Model, IJCAI 2022 (Long). PaddleOCR Doc, Paper)
• NRTR (Fenfen Sheng, Zhineng Chen, Bo Xu. NRTR: A No-Recurrence Sequence-to-Sequence Model For Scene Text Recognition, ICDAR 2019. Paper)

Recent Updates

• 2026.09.21: 🔥 Releasing ScriptMoE: All-in-One Multilingual Scene Text Recognition with Script-aware Mixture-of-Experts. Accessible in Doc and Demo&Model.
• 2026.02.12: 🔥 Releasing openocr-python 0.1.5: Support the PDF file as an input; Parallel recognition of document elements; Add skill for OpenClaw Agent. Accessible in Doc.
• 2026.02.06: 🔥 Releasing openocr-python 0.1.3, and using a unified interface for OpenOCR, Document Parsing OpenDoc-0.1B, and UniRec-0.1B. Accessible in Doc.
• 2026.01.13: 🔥 Releasing CMER code and MER-17M dataset.
• 2026.01.07: 🔥 Releasing UniRec40M dataset, which includes 40 million instances of recognition data comprising text, formulas, and text-formula mixed content.
• 2025.12.25: 🔥 Releasing OpenDoc-0.1B: Ultra-Lightweight Document Parsing System with 0.1B Parameters
• 2025.11.08: Our paper MDiff4STR is accepted by AAAI 2026 (Oral). Accessible in Doc.
• 2025.11.08: Our paper CMER is accepted by AAAI 2026. Accessible in Doc.
• 2025.08.20: 🔥 Releasing UniRec-0.1B: Unified Text and Formula Recognition with 0.1B Parameters
• 2025.07.10: Our paper SVTRv2 is accepted by ICCV 2025. Accessible in Doc.
• 2025.07.10: Our paper TextSSR is accepted by ICCV 2025. Accessible in Code.
• 2025.03.24: 🔥 Releasing the feature of fine-tuning OpenOCR on a custom dataset: Fine-tuning Det, Fine-tuning Rec
• 2025.03.23: 🔥 Releasing the feature of ONNX model export for wider compatibility.
• 2025.02.22: Our paper CPPD is accepted by TPAMI. Accessible in Doc and PaddleOCR Doc.
• 2024.12.31: Our paper IGTR is accepted by TPAMI. Accessible in Doc.
• 2024.12.16: Our paper SMTR is accepted by AAAI 2025. Accessible in Doc.
• 2024.12.03: The pre-training code for DPTR is merged.
• 🔥 2024.11.23 release notes:
  • OpenOCR: A general OCR system with accuracy and efficiency
    • ⚡[Quick Start] [Model] [ModelScope Demo] [Hugging Face Demo] [Local Demo] [PaddleOCR Implementation]
    • Introduction
  • SVTRv2: CTC Beats Encoder-Decoder Models in Scene Text Recognition
    • [Paper] [Doc] [Model] [Datasets] [Config, Training and Inference] [Benchmark]
    • Introduction
    • Get Started with training a SOTA Scene Text Recognition model from scratch.

Reproduction schedule:

Scene Text Recognition

Method	Venue	Training	Evaluation	Contributor
CRNN	TPAMI 2016	✅	✅
ASTER	TPAMI 2019	✅	✅	pretto0
NRTR	ICDAR 2019	✅	✅
SAR	AAAI 2019	✅	✅	pretto0
MORAN	PR 2019	✅	✅
DAN	AAAI 2020	✅	✅
RobustScanner	ECCV 2020	✅	✅	pretto0
AutoSTR	ECCV 2020	✅	✅
SRN	CVPR 2020	✅	✅	pretto0
SEED	CVPR 2020	✅	✅
ABINet	CVPR 2021	✅	✅	YesianRohn
VisionLAN	ICCV 2021	✅	✅	YesianRohn
PIMNet	ACM MM 2021			TODO
SVTR	IJCAI 2022	✅	✅
PARSeq	ECCV 2022	✅	✅
MATRN	ECCV 2022	✅	✅
MGP-STR	ECCV 2022	✅	✅
LPV	IJCAI 2023	✅	✅
MAERec(Union14M)	ICCV 2023	✅	✅
LISTER	ICCV 2023	✅	✅
CDistNet	IJCV 2024	✅	✅	YesianRohn
BUSNet	AAAI 2024	✅	✅
DCTC	AAAI 2024			TODO
CAM	PR 2024	✅	✅
OTE	CVPR 2024	✅	✅
CFF	IJCAI 2024			TODO
DPTR	ACM MM 2024			fd-zs
VIPTR	ACM CIKM 2024			TODO
IGTR	TPAMI 2025	✅	✅
SMTR	AAAI 2025	✅	✅
CPPD	TPAMI 2025	✅	✅
FocalSVTR-CTC	AAAI 2025	✅	✅
SVTRv2	ICCV 2025	✅	✅
ResNet+Trans-CTC		✅	✅
ViT-CTC		✅	✅
MDiff4STR	AAAI 2025 Oral	✅	✅
ScriptMoE	Preprint	✅	✅	YesianRohn

Scene Text Detection (STD)

TODO

Text Spotting

TODO

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Citation

If you find our method useful for your reserach, please cite:

@inproceedings{Du2025SVTRv2,
  title={SVTRv2: CTC Beats Encoder-Decoder Models in Scene Text Recognition},
  author={Yongkun Du and Zhineng Chen and Hongtao Xie and Caiyan Jia and Yu-Gang Jiang},
  booktitle={ICCV},
  year={2025},
  pages={20147-20156}
}

@article{du2025unirec,
  title={UniRec-0.1B: Unified Text and Formula Recognition with 0.1B Parameters},
  author={Yongkun Du and Zhineng Chen and Yazhen Xie and Weikang Bai and Hao Feng and Wei Shi and Yuchen Su and Can Huang and Yu-Gang Jiang},
  journal={arXiv preprint arXiv:2512.21095},
  year={2025}
}

@article{Ye2026ScriptMoE,
  title={All-in-One Multilingual Scene Text Recognition with Script-aware Mixture-of-Experts},
  author={Xingsong Ye and Yongkun Du and Jiaxin Zhang and Zhixian Li and Chong Sun and Chen Li and Jing Lyu and Lianwen Jin and Zhineng Chen},
  journal={arXiv preprint},
  year={2026}
}

Acknowledgement

This codebase is built based on the PaddleOCR, PytorchOCR, and MMOCR. Thanks for their awesome work!