Quick answer
The most common PDF OCR questions are format, quality, permissions, batch failures and privacy. PDF OCR turns scanned page images into searchable/copyable text; text-layer PDFs don't need OCR.
Why it matters
Checking these high-frequency issues solves most cases.
Try selecting text to detect a text layer.
Step by step
- Check for a text layer: if text is selectable/copyable, OCR may be unnecessary.
- For scans, raise resolution/contrast and deskew.
- Pick the right language (Chinese/English/mixed) and only the needed pages.
- Proofread numbers/amounts/dates/names; don't trust OCR blindly.
- Export TXT/copy, keep the original PDF and a proofreading record.
Common mistakes
- OCR-ing a PDF that already has a text layer and adding errors.
- Low-resolution/skewed scans producing poor accuracy.
- Using one language for mixed Chinese/English pages.
- Not proofreading amounts/dates/IDs before importing.
Checklist
- Text layer vs scan determined.
- Resolution/orientation/contrast handled.
- Language/page range chosen correctly.
- Numbers/amounts/dates/names proofread.
- Original PDF/proofreading record kept.
Key facts
- Try selecting text to detect a text layer.
- Always proofread OCR output.
FAQ
What are common PDF OCR questions?
The most common PDF OCR questions are format, quality, permissions, batch failures and privacy. PDF OCR turns scanned page images into searchable/copyable text; text-layer PDFs don't need OCR.
How long does it take?
Usually 1-3 minutes; for intermittent issues, run 30 seconds and retest elsewhere.
Is data uploaded?
Runs locally and does not upload video/audio; extensions may still read the page.
Source: Tesseract