Integration
Pdf Ocr
By OpenClaw plugin for OCR text extraction from scanned PDFs and images — Tesseract OCR with 100+ languages, configurable DPI, word-level bounding boxes, character whitelisting, image preprocessing (grayscale, sharpen, threshold, resize), and document scanning with perspective correction. Powered by PDFAPIHub API. Free API key at pdfapihub.com
Install
openclaw plugins install clawhub:pdf-ocrConfiguration Example
{
"plugins": {
"entries": {
"pdf-ocr": {
"enabled": true,
"env": {
"PDFAPIHUB_API_KEY": "your-api-key-here"
}
}
}
}
}README
# PDF & Image OCR — OpenClaw Plugin
Extract text from scanned PDFs and images using the [PDFAPIHub](https://pdfapihub.com) API. This OpenClaw plugin provides Tesseract OCR with 100+ languages, document photo enhancement, and visual document comparison.
## What It Does
Read text from scanned documents and photos using OCR, clean up document photos into professional scans, and compare documents for visual similarity.
### Features
- **PDF OCR** — Rasterise and OCR scanned PDFs with configurable DPI (72-400)
- **Image OCR** — OCR photos of receipts, documents, signs, business cards, meter readings
- **100+ Languages** — Tesseract language packs, combine with `+` (e.g. `eng+hin+fra`)
- **Word-Level Bounding Boxes** — Per-word positions and confidence scores
- **Character Whitelisting** — Restrict to digits only for invoice amounts or meter readings
- **Image Preprocessing** — Grayscale, sharpen, threshold, resize/upscale for noisy inputs
- **Document Scan Enhancement** — Edge detection, perspective correction, brightness/contrast
- **Color Modes** — B&W (best for text), grayscale, enhanced color
- **PDF Output** — Export scanned documents as single-page PDFs
- **Document Comparison** — Visual similarity scoring with feature matching, SSIM, or phash
- **Confidence Scores** — Per-page and per-word OCR confidence percentages
## Tools
| Tool | Description |
|------|-------------|
| `ocr_pdf` | OCR scanned PDFs with multi-language Tesseract |
| `ocr_image` | OCR images with preprocessing options |
| `scan_enhance` | Clean up document photos into professional scans |
| `compare_documents` | Compare two images/PDFs for visual similarity |
## Installation
```bash
openclaw plugins install clawhub:pdf-ocr
```
## Configuration
Add your API key in `~/.openclaw/openclaw.json`:
```json
{
"plugins": {
"entries": {
"pdf-ocr": {
"enabled": true,
"env": {
"PDFAPIHUB_API_KEY": "your-api-key-here"
}
}
}
}
}
```
Get your **free API key** at [https://pdfapihub.com](https://pdfapihub.com).
## Usage Examples
Just ask your OpenClaw agent:
- *"Extract text from this scanned PDF"*
- *"OCR this document in English and Hindi at 300 DPI"*
- *"Extract only the numbers from this invoice scan"*
- *"Read the text from this receipt photo"*
- *"Clean up this document photo to look like a scan"*
- *"Scan this photo then OCR the result"*
- *"How similar are these two documents?"*
## Use Cases
- **Invoice Processing** — OCR scanned invoices to extract line items and totals
- **Receipt Scanning** — Extract text from receipt photos for expense tracking
- **Document Digitization** — Convert legacy paper documents to searchable text
- **Multi-Language Documents** — Process documents in Hindi, French, German, Arabic, etc.
- **Business Card Reading** — Extract name, phone, and email from card photos
- **Meter Reading** — Extract digits from utility meter photos with character whitelisting
- **Document Photo Cleanup** — Turn phone photos into clean, professional scans
- **Fraud Detection** — Compare documents for visual similarity
- **QA Testing** — Compare rendered documents before and after changes
## API Documentation
Full API docs: [https://pdfapihub.com/docs](https://pdfapihub.com/docs)
## License
MIT
integration
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