allenai/olmocr

A toolkit for converting PDFs and other image-based document formats into clean, readable, plain text format.

Try the online demo: https://olmocr.allenai.org/

Features:

• Convert PDF, PNG, and JPEG based documents into clean Markdown
• Support for equations, tables, handwriting, and complex formatting
• Automatically removes headers and footers
• Convert into text with a natural reading order, even in the presence of

figures, multi-column layouts, and insets

• Efficient, less than $200 USD per million pages converted
• (Based on a 7B parameter VLM, so it requires a GPU)

News

• October 21, 2025 - v0.4.0 - New model release, boosts olmOCR-bench score by ~4 points using synthetic data and introduces RL training.
• August 13, 2025 - v0.3.0 - New model release, fixes auto-rotation detection, and hallucinations on blank documents.
• July 24, 2025 - v0.2.1 - New model release, scores 3 points higher on olmOCR-Bench, also runs significantly faster because it's default FP8, and needs much fewer retries per document.
• July 23, 2025 - v0.2.0 - New cleaned up trainer code, makes it much simpler to train olmOCR models yourself.
• June 17, 2025 - v0.1.75 - Switch from sglang to vllm based inference pipeline, updated docker image to CUDA 12.8.
• May 23, 2025 - v0.1.70 - Official docker support and images are now available! See Docker usage
• May 19, 2025 - v0.1.68 - olmOCR-Bench launch, scoring 77.4. Launch includes 2 point performance boost in olmOCR pipeline due to bug fixes with prompts.
• Mar 17, 2025 - v0.1.60 - Performance improvements due to better temperature selection in sampling.
• Feb 25, 2025 - v0.1.58 - Initial public launch and demo.

Benchmark

olmOCR-Bench: We also ship a comprehensive benchmark suite covering over 7,000 test cases across 1,400 documents to help measure performance of OCR systems.

	ArXiv	Old scans math	Tables	Old scans	Headers & footers	Multi column	Long tiny text	Base	Overall
Mistral OCR API	77.2	67.5	60.6	29.3	93.6	71.3	77.1	99.4	72.0±1.1
Marker 1.10.1	83.8	66.8	72.9	33.5	86.6	80.0	85.7	99.3	76.1±1.1
MinerU 2.5.4*	76.6	54.6	84.9	33.7	96.6	78.2	83.5	93.7	75.2±1.1
DeepSeek-OCR	77.2	73.6	80.2	33.3	96.1	66.4	79.4	99.8	75.7±1.0
Nanonets-OCR2-3B	75.4	46.1	86.8	40.9	32.1	81.9	93.0	99.6	69.5±1.1
PaddleOCR-VL*	85.7	71.0	84.1	37.8	97.0	79.9	85.7	98.5	80.0±1.0
Infinity-Parser 7B*	84.4	83.8	85.0	47.9	88.7	84.2	86.4	99.8	82.5±?
Chandra OCR 0.1.0*	82.2	80.3	88.0	50.4	90.8	81.2	92.3	99.9	83.1±0.9
olmOCR v0.4.0	83.0	82.3	84.9	47.7	96.1	83.7	81.9	99.7	82.4±1.1

Installation

System Dependencies

You will need to install poppler-utils and additional fonts for rendering PDF images.

Install dependencies (Ubuntu/Debian):

sudo apt-get update
sudo apt-get install poppler-utils ttf-mscorefonts-installer msttcorefonts fonts-crosextra-caladea fonts-crosextra-carlito gsfonts lcdf-typetools

Python Installation

Set up a conda environment and install olmocr. The requirements for running olmOCR are difficult to install in an existing python environment, so please do make a clean python environment to install into.

conda create -n olmocr python=3.11
conda activate olmocr

Choose the installation option that matches your use case:

Option 1: Remote Inference (Lightweight)

If you plan to use a remote vLLM server with the --server flag, install the base package:

pip install olmocr

This avoids installing heavy GPU dependencies like PyTorch (~2GB+).

Option 2: Local GPU Inference

Requirements:

• Recent NVIDIA GPU (tested on RTX 4090, L40S, A100, H100) with at least 12 GB of GPU RAM
• 30GB of free disk space

For running inference with your own GPU:

pip install olmocr[gpu] --extra-index-url https://download.pytorch.org/whl/cu128

Recommended: Install flash infer for faster inference on GPU
pip install https://download.pytorch.org/whl/cu128/flashinfer/flashinfer_python-0.2.5%2Bcu128torch2.7-cp38-abi3-linux_x86_64.whl

Option 3: Beaker Cluster Execution

For submitting jobs to Beaker clusters with the --beaker flag:

pip install olmocr[beaker]

Option 4: Benchmark Suite

For running the olmOCR benchmark suite:

pip install olmocr[bench]

Combined Installation

You can combine multiple options:

# GPU + Beaker support
pip install olmocr[gpu,beaker] --extra-index-url https://download.pytorch.org/whl/cu128

GPU + Benchmark support
pip install olmocr[gpu,bench] --extra-index-url https://download.pytorch.org/whl/cu128

Troubleshooting

If you run into errors about too many open files, update your ulimit:

ulimit -n 65536

Usage Examples

For quick testing, try the web demo.

Convert a Single PDF (Local GPU):

# Download a sample PDF
curl -o olmocr-sample.pdf https://olmocr.allenai.org/papers/olmocr_3pg_sample.pdf

Convert it to markdown
olmocr ./localworkspace --markdown --pdfs olmocr-sample.pdf

Convert an Image file:

olmocr ./localworkspace --markdown --pdfs random_page.png

Convert Multiple PDFs:

olmocr ./localworkspace --markdown --pdfs tests/gnarly_pdfs/*.pdf

Use Remote Inference Server:

olmocr ./localworkspace --server http://remote-server:8000/v1 --model allenai/olmOCR-2-7B-1025-FP8 --markdown --pdfs *.pdf

With the --markdown flag, results will be stored as markdown files inside of ./localworkspace/markdown/.

Note: You can also use python -m olmocr.pipeline instead of olmocr if you prefer.

Viewing Results

The ./localworkspace/ workspace folder will then have both Dolma and markdown files (if using --markdown).

cat localworkspace/markdown/olmocr-sample.md 

olmOCR: Unlocking Trillions of Tokens in PDFs with Vision Language Models
...

Using an Inference Provider or External Server

If you have a vLLM server already running elsewhere (or any inference platform implementing the OpenAI API), you can point olmOCR to use it instead of spawning a local instance.

Installation for Remote Inference:

# Lightweight installation - no GPU dependencies needed
pip install olmocr

Using an External Server:

# Use external vLLM server instead of local one
olmocr ./localworkspace --server http://remote-server:8000/v1 --model allenai/olmOCR-2-7B-1025-FP8 --markdown --pdfs tests/gnarly_pdfs/*.pdf

The served model name in vLLM needs to match the value provided in --model.

Example vLLM Server Launch:

vllm serve allenai/olmOCR-2-7B-1025-FP8 --max-model-len 16384

Verified External Providers

We have tested olmOCR-2-7B-1025-FP8 on these external model providers and confirmed that they work

| | $/1M Input tokens | $/1M Output tokens | Example Command | |-----------------------------------------------------------------------------|-------------------|--------------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| | Cirrascale | $0.07 | $0.15 | olmocr ./workspace --server https://ai2endpoints.cirrascale.ai/api --api_key sk-XXXXXXX --workers 1 --max_concurrent_requests 20 --model olmOCR-2-7B-1025 --pdfs tests/gnarly_pdfs/*.pdf | | DeepInfra | $0.09 | $0.19 | olmocr ./workspace --server https://api.deepinfra.com/v1/openai --api_key DfXXXXXXX --workers 1 --max_concurrent_requests 20 --model allenai/olmOCR-2-7B-1025 --pdfs tests/gnarly_pdfs/*.pdf | | Parasail | $0.10 | $0.20 | olmocr ./workspace --server https://api.parasail.io/v1 --api_key psk-XXXXX --workers 1 --max_concurrent_requests 20 --model allenai/olmOCR-2-7B-1025 --pdfs tests/gnarly_pdfs/*.pdf |

Notes on arguments

• --server: Defines the OpenAI-compatible endpoint: ex https://api.deepinfra.com/v1/openai
• --api_key: Your API key, bassed in via Authorization Bearer HTTP header
• --max_concurrent_requests: Max concurrent requests that will be in-flight to the inference provider at one time
• --workers: Max number of page groups that will be processed at once. You may want to set this to 1 so that you finish one group of stuff before moving on.
• --pages_per_group: You may want a smaller number of pages per group as many external provides have lower concurrent request limits
• --model: The model identifier, ex. allenai/olmOCR-2-7B-1025, different providers have different names, and if you run locally, you can use olmocr
• Other arguments work the same as with local inference

Multi-node / Cluster Usage

If you want to convert millions of PDFs using multiple nodes running in parallel, olmOCR supports reading PDFs from AWS S3 and coordinating work using an AWS S3 output bucket.

Start the first worker node:

olmocr s3://my_s3_bucket/pdfworkspaces/exampleworkspace --pdfs s3://my_s3_bucket/jakep/gnarly_pdfs/*.pdf

This sets up a simple work queue in your AWS bucket and starts converting PDFs.

On subsequent worker nodes:

olmocr s3://my_s3_bucket/pdfworkspaces/exampleworkspace

They will automatically start grabbing items from the same workspace queue.

Using Beaker for Cluster Execution

If you are at Ai2 and want to linearize millions of PDFs efficiently using beaker, install with Beaker support:

pip install olmocr[gpu,beaker] --extra-index-url https://download.pytorch.org/whl/cu128

Then use the --beaker flag to prepare the workspace locally and launch N GPU workers in the cluster:

olmocr s3://my_s3_bucket/pdfworkspaces/exampleworkspace --pdfs s3://my_s3_bucket/jakep/gnarly_pdfs/*.pdf --beaker --beaker_gpus 4

Using Docker

Pull the Docker image (large, includes the model, ~30GB):

docker pull alleninstituteforai/olmocr:latest-with-model

For advanced users who want to manage their own model downloads, we also provide a base image without the model:

docker pull alleninstituteforai/olmocr:latest

Quick Start - Process PDFs

Process a single PDF in your current directory:

docker run --gpus all \
  -v $(pwd):/workspace \
  alleninstituteforai/olmocr:latest-with-model \
  -c "olmocr /workspace/output --markdown --pdfs /workspace/sample.pdf"

Process multiple PDFs:

docker run --gpus all \
  -v /path/to/pdfs:/input \
  -v /path/to/output:/output \
  alleninstituteforai/olmocr:latest-with-model \
  -c "olmocr /output --markdown --pdfs /input/*.pdf"

Interactive Mode

Run the container interactively for exploration and debugging:

docker run -it --gpus all alleninstituteforai/olmocr:latest-with-model

Visit our Docker repository on Docker Hub for more information.

Full Documentation

To see all available options:

olmocr --help
usage: pipeline.py [-h] [--pdfs [PDFS ...]] [--model MODEL] [--workspace_profile WORKSPACE_PROFILE] [--pdf_profile PDF_PROFILE] [--pages_per_group PAGES_PER_GROUP] [--max_page_retries MAX_PAGE_RETRIES] [--max_page_error_rate MAX_PAGE_ERROR_RATE] [--workers WORKERS]
                   [--apply_filter] [--stats] [--markdown] [--target_longest_image_dim TARGET_LONGEST_IMAGE_DIM] [--target_anchor_text_len TARGET_ANCHOR_TEXT_LEN] [--guided_decoding] [--gpu-memory-utilization GPU_MEMORY_UTILIZATION] [--max_model_len MAX_MODEL_LEN]
                   [--tensor-parallel-size TENSOR_PARALLEL_SIZE] [--data-parallel-size DATA_PARALLEL_SIZE] [--port PORT] [--server SERVER] [--beaker] [--beaker_workspace BEAKER_WORKSPACE] [--beaker_cluster BEAKER_CLUSTER] [--beaker_gpus BEAKER_GPUS] [--beaker_priority BEAKER_PRIORITY]
                   workspace

Manager for running millions of PDFs through a batch inference pipeline
positional arguments:
  workspace             The filesystem path where work will be stored, can be a local folder, or an s3 path if coordinating work with many workers, s3://bucket/prefix/
options:
  -h, --help            show this help message and exit
  --pdfs [PDFS ...]     Path to add pdfs stored in s3 to the workspace, can be a glob path s3://bucket/prefix/*.pdf or path to file containing list of pdf paths
  --model MODEL         Path where the model is located, allenai/olmOCR-7B-0725-FP8 is the default, can be local, s3, or hugging face.
  --workspace_profile WORKSPACE_PROFILE
                        S3 configuration profile for accessing the workspace
  --pdf_profile PDF_PROFILE
                        S3 configuration profile for accessing the raw pdf documents
  --pages_per_group PAGES_PER_GROUP
                        Aiming for this many pdf pages per work item group
  --max_page_retries MAX_PAGE_RETRIES
                        Max number of times we will retry rendering a page
  --max_page_error_rate MAX_PAGE_ERROR_RATE
                        Rate of allowable failed pages in a document, 1/250 by default
  --workers WORKERS     Number of workers to run at a time
  --apply_filter        Apply basic filtering to English pdfs which are not forms, and not likely seo spam
  --stats               Instead of running any job, reports some statistics about the current workspace
  --markdown            Also write natural text to markdown files preserving the folder structure of the input pdfs
  --target_longest_image_dim TARGET_LONGEST_IMAGE_DIM
                        Dimension on longest side to use for rendering the pdf pages
  --target_anchor_text_len TARGET_ANCHOR_TEXT_LEN
                        Maximum amount of anchor text to use (characters), not used for new models
  --guided_decoding     Enable guided decoding for model YAML type outputs
VLLM arguments:
  --gpu-memory-utilization GPU_MEMORY_UTILIZATION
                        Fraction of VRAM vLLM may pre-allocate for KV-cache (passed through to vllm serve).
  --max_model_len MAX_MODEL_LEN
                        Upper bound (tokens) vLLM will allocate KV-cache for, lower if VLLM won't start
  --tensor-parallel-size TENSOR_PARALLEL_SIZE, -tp TENSOR_PARALLEL_SIZE
                        Tensor parallel size for vLLM
  --data-parallel-size DATA_PARALLEL_SIZE, -dp DATA_PARALLEL_SIZE
                        Data parallel size for vLLM
  --port PORT           Port to use for the VLLM server
  --server SERVER       URL of external vLLM (or other compatible provider)
                        server (e.g., http://hostname:port). If provided,
                        skips spawning local vLLM instance
beaker/cluster execution:
  --beaker              Submit this job to beaker instead of running locally
  --beaker_workspace BEAKER_WORKSPACE
                        Beaker workspace to submit to
  --beaker_cluster BEAKER_CLUSTER
                        Beaker clusters you want to run on
  --beaker_gpus BEAKER_GPUS
                        Number of gpu replicas to run
  --beaker_priority BEAKER_PRIORITY
                        Beaker priority level for the job

Code overview

There are some nice reusable pieces of the code that may be useful for your own projects:

• A prompting strategy to get really good natural text parsing using ChatGPT 4o - buildsilver.py
• Basic filtering by language and SEO spam removal - filter.py
• SFT Finetuning code for Qwen2.5-VL - train.py
• GRPO RL Trainer - grpo_train.py
• Synthetic data generation - mine_html_templates.py
• Processing millions of PDFs through a finetuned model using VLLM - pipeline.py
• Viewing Dolma docs created from PDFs - dolmaviewer.py

Team

olmOCR is developed and maintained by the AllenNLP team, backed by the Allen Institute for Artificial Intelligence (AI2). AI2 is a non-profit institute with the mission to contribute to humanity through high-impact AI research and engineering. To learn more about who specifically contributed to this codebase, see our contributors page.

License

olmOCR is licensed under Apache 2.0. A full copy of the license can be found on GitHub.

Citing

For olmOCR v1 and OlmOCR-bench:

@misc{olmocrbench,
      title={{olmOCR: Unlocking Trillions of Tokens in PDFs with Vision Language Models}},
      author={Jake Poznanski and Jon Borchardt and Jason Dunkelberger and Regan Huff and Daniel Lin and Aman Rangapur and Christopher Wilhelm and Kyle Lo and Luca Soldaini},
      year={2025},
      eprint={2502.18443},
      archivePrefix={arXiv},
      primaryClass={cs.CL},
      url={https://arxiv.org/abs/2502.18443},
}

For olmOCR v2 Unit Testing Rewards with RL:

@misc{olmocr2,
      title={olmOCR 2: Unit Test Rewards for Document OCR}, 
      author={Jake Poznanski and Luca Soldaini and Kyle Lo},
      year={2025},
      eprint={2510.19817},
      archivePrefix={arXiv},
      primaryClass={cs.CV},
      url={https://arxiv.org/abs/2510.19817}, 
}