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---
name: pypdf-common-issues
description: 'Sub-skill of pypdf: Common Issues.'
version: 1.0.0
category: data
type: reference
scripts_exempt: true
---
# Common Issues
## Common Issues
#### 1. Encrypted PDF Error
```python
# Problem: Cannot read encrypted PDF
# Solution: Decrypt first
reader = PdfReader("encrypted.pdf")
if reader.is_encrypted:
reader.decrypt("password") # Provide password
```
#### 2. Text Extraction Returns Empty
```python
# Problem: extract_text() returns empty string
# Solution: PDF may be image-based (scanned)
# For scanned PDFs, use OCR:
# pip install pdf2image pytesseract
# Then use pytesseract to OCR the images
```
#### 3. Memory Error with Large PDFs
```python
# Problem: Memory error with large files
# Solution: Process incrementally
def split_large_pdf(input_path, output_dir, max_pages=100):
reader = PdfReader(input_path)
total = len(reader.pages)
for start in range(0, total, max_pages):
writer = PdfWriter()
end = min(start + max_pages, total)
for i in range(start, end):
writer.add_page(reader.pages[i])
writer.write(f"{output_dir}/part_{start//max_pages + 1}.pdf")
```
