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StackToPDF

Professional document scanning and OCR with Tesseract

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Getting Started

01 Download & Install

1. Download from Downloads
2. Run the installer
3. Launch StackToPDF

02 Add Documents

• Drag & drop images or scan directly
• Supports JPG, PNG, TIFF, BMP

03 Enhance & Arrange

• Auto-enhance for better readability
• Reorder pages by dragging
• Rotate, crop, or delete pages

04 Export PDF

1. Choose output settings
2. Enable OCR if needed
3. Click Export

Features

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Tesseract OCR

Industry-leading open-source OCR engine. Extract text from scanned documents to create searchable PDFs. Supports 100+ languages.

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Image Enhancement

Automatic deskewing, contrast adjustment, and noise reduction. Turn phone photos into professional-looking scans.

Batch Processing

Process hundreds of pages at once. Perfect for digitizing paper archives.

100% Offline

All processing happens locally. Your documents never leave your computer.

Scanner Support

Works with TWAIN and WIA scanners. Scan directly into the app.

PDF/A Compliance

Create archival-quality PDFs for long-term document storage.

OCR (Text Recognition)

How OCR Works

OCR (Optical Character Recognition) analyzes your scanned images and converts the visual text into actual, selectable, searchable text embedded in your PDF.

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Scan

Image of document

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Process

Tesseract analyzes

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Output

Searchable PDF

Supported Languages

Tesseract supports 100+ languages. Common languages are included by default:

English Spanish French German Chinese Japanese Korean + many more

FAQ

Is StackToPDF free? ▼

Yes, completely free. No watermarks, no page limits, no subscription required.

Do my documents get uploaded anywhere? ▼

No. All processing happens locally on your computer. StackToPDF works completely offline.

How accurate is the OCR? ▼

Tesseract typically achieves 95%+ accuracy on clean, high-resolution scans. Image enhancement features help improve results on lower-quality sources.

Can I use my phone camera instead of a scanner? ▼

Yes! Take photos of documents with your phone, transfer them to your computer, and import into StackToPDF. The image enhancement features help correct perspective and lighting issues.

System Requirements

✓ Windows 10 or 11 (64-bit)

✓ 4GB RAM minimum

✓ TWAIN/WIA scanner (optional)

Ready to Digitize Your Documents?

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