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# Encryption and Decryption of PDFs
> Please see the note in the [installation guide](installation.md)
> for installing the extra dependencies if interacting with PDFs that use AES.
## Encrypt
Add a password to a PDF (encrypt it):
```python
from PyPDF2 import PdfReader, PdfWriter
reader = PdfReader("example.pdf")
writer = PdfWriter()
# Add all pages to the writer
for page in reader.pages:
writer.add_page(page)
# Add a password to the new PDF
writer.encrypt("my-secret-password")
# Save the new PDF to a file
with open("encrypted-pdf.pdf", "wb") as f:
writer.write(f)
```
## Decrypt
Remove the password from a PDF (decrypt it):
```python
from PyPDF2 import PdfReader, PdfWriter
reader = PdfReader("encrypted-pdf.pdf")
writer = PdfWriter()
if reader.is_encrypted:
reader.decrypt("my-secret-password")
# Add all pages to the writer
for page in reader.pages:
writer.add_page(page)
# Save the new PDF to a file
with open("decrypted-pdf.pdf", "wb") as f:
writer.write(f)
```
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