PDF encryption makes use of RC4 and AES algorithms with different key length. pypdf supports all of them until PDF-2.0, which is the latest PDF standard.
pypdf use an extra dependency to do encryption or decryption for AES algorithms. We recommend pyca/cryptography. Alternatively, you can use pycryptodome.
Note
Please see the note in the installation guide for installing the extra dependencies if interacting with PDFs that use AES.
EncryptYou can encrypt a PDF by using a password:
from pypdf import PdfReader, PdfWriter
reader = PdfReader("example.pdf")
writer = PdfWriter(clone_from=reader)
# Add a password to the new PDF
writer.encrypt("my-secret-password", algorithm="AES-256")
# Save the new PDF to a file
with open("encrypted-pdf.pdf", "wb") as f:
writer.write(f)
The algorithm can be one of RC4-40, RC4-128, AES-128, AES-256-R5, AES-256. We recommend using AES-256-R5.
Warning
pypdf uses RC4 by default for compatibility if you omit the “algorithm” parameter. Since RC4 is insecure, you should use AES algorithms.
You can decrypt a PDF using the appropriate password:
from pypdf import PdfReader, PdfWriter
reader = PdfReader("encrypted-pdf.pdf")
if reader.is_encrypted:
reader.decrypt("my-secret-password")
writer = PdfWriter(clone_from=reader)
# Save the new PDF to a file
with open("decrypted-pdf.pdf", "wb") as f:
writer.write(f)
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