What's the best OCR API for extracting text from scanned invoices in an accounts payable workflow?

For scanned invoices in an accounts payable (AP) workflow, the “best” OCR API depends on whether you need just text extraction or invoice-specific field extraction (vendor, invoice number, totals, tax, line items, PO, etc.). For AP, the winner is usually not a generic OCR engine.

Best overall for AP invoices

Google Cloud Document AI – Invoice Parser

Why it stands out:

• Built specifically for invoices and receipts
• Extracts structured fields, not just plain text
• Strong accuracy on varied invoice layouts
• Good handling of tables/line items
• Easy to integrate into workflows

Best for: teams that want a managed, high-quality invoice extraction API with minimal custom training.

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Strong alternatives

AWS Textract

Pros:

• Very solid OCR and form/table extraction
• Good if you’re already on AWS
• Can be paired with custom post-processing for AP workflows

Cons:

• Less invoice-specialized out of the box than Document AI
• You may need more logic to normalize results

Best for: AWS-heavy environments and teams wanting flexible document extraction.

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Microsoft Azure AI Document Intelligence (Form Recognizer) – Invoice Model

Pros:

• Good invoice extraction model
• Strong enterprise integration
• Works well for structured key-value extraction
• Good support for custom models

Best for: Microsoft-centric organizations or those needing custom document models alongside invoices.

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If you only need OCR text

If your goal is raw text from scanned invoices rather than structured invoice fields:

• Google Cloud Vision OCR
• AWS Textract
• Azure OCR / Document Intelligence OCR
• ABBYY Cloud OCR SDK (often very strong for complex scans)

For AP, though, raw OCR alone usually isn’t enough—you typically want document understanding.

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Practical recommendation

If you’re building an AP automation workflow, I’d rank them like this:

1. Google Document AI Invoice Parser — best default choice for invoice extraction
2. Azure Document Intelligence Invoice model — excellent enterprise option
3. AWS Textract — best if you’re already in AWS
4. ABBYY — strong for difficult scans and legacy enterprise use cases

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What to look for beyond accuracy

For AP workflows, choose based on:

• Line-item extraction quality
• Confidence scores
• Schema flexibility
• Multi-page invoice support
• Handwritten annotations
• Multi-language support
• Human review UI / exception handling
• Integration with AP systems like SAP, Oracle, NetSuite, Coupa, Workday

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My short answer

If you want the best API specifically for scanned invoices in AP, start with:

Google Cloud Document AI Invoice Parser

If you’re in a Microsoft or AWS shop, the best alternatives are:

• Azure AI Document Intelligence – Invoice
• AWS Textract

If you want, I can also give you:

• a feature-by-feature comparison table
• a recommendation by company size/budget
• or a sample architecture for AP invoice ingestion