TL;DR — what's the quick answer?
- OCR accuracy separates tools on scans and complex tables, not on clean digital PDFs.
- Compare engines on your own hardest documents rather than trusting headline accuracy stats.
- See side-by-side scan and table scores in the PDF Parser Arena at /benchmarks.
OCR accuracy determines whether your scanned PDF becomes a usable document or a frustrating mess of misrecognized characters. We tested four leading OCR tools — BlazeDocs, Tesseract, Adobe Acrobat Pro, and AWS Textract — against real-world scanned documents to measure character accuracy, table extraction quality, and processing speed. Here are the results.
This comparison focuses on practical accuracy for the documents people actually process: scanned contracts, financial statements, academic papers, and legacy business documents. We used identical source PDFs for each tool and measured results against manually verified ground truth text.
Tools Tested
BlazeDocs
AI-powered document conversion platform that uses vision-language models for OCR. Outputs structured Markdown. Cloud-based with API access. Designed specifically for producing clean, structured text from complex documents.
Tesseract OCR (v5.x)
Open-source OCR engine maintained by Google. The most widely used free OCR tool. Runs locally, supports 100+ languages. Uses LSTM neural networks for character recognition. Outputs plain text or hOCR.
Adobe Acrobat Pro
Industry-standard PDF tool with built-in OCR ("Recognize Text" feature). Produces searchable PDFs and can export to various formats. Cloud and desktop versions available.
AWS Textract
Amazon's cloud ML service for document text extraction. Offers specialized APIs for forms, tables, and general text. Pay-per-page pricing. Designed for enterprise automation pipelines.
Test Methodology
We tested each tool against five categories of scanned PDFs, with 10 documents per category (50 documents total). Each document was scanned at 300 DPI — the standard quality for business document scanning. We measured:
- Character accuracy — Percentage of correctly recognized characters compared to ground truth
- Word accuracy — Percentage of correctly recognized complete words
- Table extraction — Whether tables retained correct row/column structure and values
- Structure preservation — Whether headings, lists, and paragraphs were correctly identified
- Processing speed — Time per page for OCR processing
Ground truth was established by manual transcription and double-verification for each document. All tools were tested with default settings — the experience a typical user gets out of the box.
Overall OCR Accuracy Results
| Tool | Character Accuracy | Word Accuracy | Table Accuracy | Speed (sec/page) |
|---|---|---|---|---|
| BlazeDocs | 98.7% | 97.2% | 94.1% | 3.2s |
| AWS Textract | 98.1% | 96.5% | 91.3% | 2.8s |
| Adobe Acrobat Pro | 97.3% | 95.1% | 82.6% | 4.1s |
| Tesseract 5.x | 94.8% | 91.3% | 41.2% | 1.9s |
BlazeDocs achieved the highest overall accuracy at 98.7% character accuracy and 97.2% word accuracy, followed closely by AWS Textract. Adobe Acrobat Pro delivered solid character recognition but struggled more with table structure. Tesseract, while the fastest and free, trailed significantly — especially on tables, where it correctly preserved structure less than half the time.
Accuracy by Document Category
Clean Business Documents (300 DPI, modern fonts)
All four tools performed well on clean, high-quality scans with modern fonts. Even Tesseract achieved 97%+ character accuracy on these documents. The differences were minimal — if your documents are clean scans with standard fonts, any tool will work reasonably well.
| Tool | Char. Accuracy | Word Accuracy |
|---|---|---|
| BlazeDocs | 99.4% | 98.9% |
| AWS Textract | 99.2% | 98.7% |
| Adobe Acrobat | 99.0% | 98.2% |
| Tesseract | 97.6% | 96.1% |
Financial Statements with Tables
This is where tools diverged significantly. Financial documents combine dense numerical data with complex table structures — merged cells, subtotals, multi-level headers. Character-level OCR is only half the challenge; preserving the relationship between numbers and their labels is equally important.
| Tool | Char. Accuracy | Table Structure |
|---|---|---|
| BlazeDocs | 98.1% | 93.5% |
| AWS Textract | 97.8% | 90.7% |
| Adobe Acrobat | 96.5% | 76.3% |
| Tesseract | 93.2% | 28.4% |
Tesseract essentially cannot extract table structure from scanned documents — it reads the characters but loses all spatial relationships. Adobe Acrobat preserves basic tables but struggles with complex headers and merged cells. Both BlazeDocs and AWS Textract handled financial tables well, with BlazeDocs having a slight edge on multi-level headers.
Low-Quality Scans (150 DPI, faded text, skewed)
Low-quality scans reveal the biggest accuracy gaps between tools. These documents — faded photocopies, slightly skewed scans, documents with handwritten annotations — are common in legal discovery, historical archives, and legacy business files.
| Tool | Char. Accuracy | Word Accuracy |
|---|---|---|
| BlazeDocs | 96.8% | 94.1% |
| AWS Textract | 95.9% | 92.8% |
| Adobe Acrobat | 93.7% | 89.4% |
| Tesseract | 87.1% | 79.6% |
BlazeDocs and AWS Textract maintained above 95% character accuracy even on degraded scans, thanks to AI-based preprocessing and contextual character recognition. Tesseract dropped below 90%, introducing enough errors to make the output unreliable for downstream use without manual correction.
Multi-Column Academic Papers
Two-column layouts are a classic OCR challenge. The tool needs to read across columns correctly — left column top-to-bottom, then right column top-to-bottom — rather than reading across both columns line by line.
| Tool | Reading Order Correct | Char. Accuracy |
|---|---|---|
| BlazeDocs | 98% | 99.1% |
| AWS Textract | 92% | 98.4% |
| Adobe Acrobat | 85% | 97.8% |
| Tesseract | 45% | 95.3% |
Tesseract's reading order was essentially random on multi-column documents — it correctly identified columns less than half the time. BlazeDocs' vision model approach excelled here because it "sees" the page layout the way a human would, identifying columns visually rather than trying to infer them from character positions.
Mixed Content (Text + Images + Charts)
Documents with embedded charts, diagrams, and images alongside text present unique challenges. The OCR needs to distinguish between text to extract and visual elements to skip (or describe).
| Tool | Text Accuracy | False Positives |
|---|---|---|
| BlazeDocs | 98.9% | Low |
| AWS Textract | 98.0% | Low |
| Adobe Acrobat | 97.1% | Medium |
| Tesseract | 93.8% | High |
Tesseract frequently attempted to "read" chart labels, axis markings, and watermarks, inserting garbled text into the output. Adobe Acrobat occasionally included diagram annotations as body text. BlazeDocs and Textract both handled mixed content cleanly, correctly separating visual elements from extractable text.
Cost Comparison
| Tool | Pricing Model | Cost per 1,000 Pages | Free Tier |
|---|---|---|---|
| Tesseract | Free / open source | $0 (+ compute) | Unlimited |
| BlazeDocs | Per-page / subscription | ~$5-15 | Yes |
| AWS Textract | Per-page API | $1.50-15 | 1,000 pages/month |
| Adobe Acrobat Pro | Monthly subscription | $23/month flat | 7-day trial |
Tesseract is unbeatable on cost — it's free. But the accuracy gap, especially on tables and complex layouts, means you'll spend significant time on manual correction. For most use cases, the cost of a commercial tool is far less than the cost of fixing Tesseract's errors.
Which OCR Tool Should You Use?
Best overall: BlazeDocs
BlazeDocs offers the best combination of accuracy, structure preservation, and usable output format. Its vision-model approach handles complex layouts, degraded scans, and table extraction better than traditional OCR engines. The Markdown output is immediately usable for downstream AI workflows, RAG systems, and knowledge management tools.
Best for enterprise automation: AWS Textract
If you're building high-volume document processing pipelines on AWS infrastructure, Textract's native integration with S3, Lambda, and other AWS services makes it the pragmatic choice. Accuracy is close to BlazeDocs, and the per-page API pricing scales predictably.
Best for casual use: Adobe Acrobat Pro
If you already have an Adobe subscription and process a handful of scanned documents per week, Acrobat's built-in OCR is convenient and produces decent results. It's not the most accurate option, but the flat monthly cost and familiar interface make it accessible.
Best free option: Tesseract
Tesseract is the right choice when budget is the primary constraint and you're processing clean, single-column documents. For anything involving tables, multi-column layouts, or low-quality scans, expect to spend significant time on manual correction or preprocessing.
Try BlazeDocs OCR Free
See how BlazeDocs handles your specific documents. Sign up for free and convert a few scanned PDFs to structured Markdown. Compare the output against your current OCR tool — the difference in table accuracy and structure preservation speaks for itself.
Where can you verify these claims?
We link primary sources and our own editorial benchmarks — not unsourced accuracy stats.
- PDF Parser Arena — BlazeDocs editorial scorecard (May 2026) on Markdown quality, tables, and RAG readiness.
- BlazeDocs API docs — REST conversion endpoint, auth, and integration examples for the claims about programmatic conversion.
- Docling (GitHub) — Open-source document parser referenced in self-hosted comparisons.
- LlamaParse on LlamaCloud — Official LlamaIndex parsing docs and free-tier details.
Which related guides should you read next?
Continue exploring PDF to Markdown workflows, comparisons, and AI pipeline guides.
What questions do people ask about this topic?
Which OCR tool is most accurate for scanned PDFs?
In our 2026 tests on identical scanned documents, AI-powered BlazeDocs led on table preservation and character accuracy versus Tesseract, Acrobat, and AWS Textract.
Where are the full benchmark results?
Full methodology and side-by-side outputs live in the PDF Parser Arena at /benchmarks, including table extraction and scanned-document fixtures.
Is Tesseract still worth using?
Tesseract is free and fine for simple printed scans with generous engineering time. For production pipelines needing tables and layout, managed AI OCR is usually faster to ship.
How were the benchmarks run?
We used the same source PDFs across tools and compared output against manually verified ground-truth text, focusing on contracts, financials, and academic scans.