How to get the length of a PDF file on AWS s3 using Python?

Pooja Patel — Tue, 22 Jul 2025 20:36:39 +0000

Ever wondered how to find the length of a pdf file on s3? You are at the right place to learn.

📝 Prerequisite:

Access to AWS account

📖 Here are the simple steps to get the length of a pdf file on AWS s3:

Login to AWS console (Create an account if you do not have one)
Look for service s3
Create a bucket and upload an object
Open VS code or your favorite IDE
Install boto3 and pypdf with below commands:

pip install boto3 pypdf

Make sure your aws credentials are configured ~/.aws/credentials, or via environment variables, or IAM roles
Copy the below python code into file named main.py and run it with the code:

python main.py

main.py:

import boto3
from pypdf import PdfReader
from io import BytesIO

#  S3 Configuration 
bucket_name = 'demo-bucket-14576876757'
pdf_key = 'sample_file.pdf'

#  Create S3 client 
s3 = boto3.client('s3')

#  Download the PDF into memory 
response = s3.get_object(Bucket=bucket_name, Key=pdf_key)
pdf_content = response['Body'].read()

#  Load PDF from memory 
reader = PdfReader(BytesIO(pdf_content))

#  Get number of pages 
num_pages = len(reader.pages)
print(f"The PDF has {num_pages} pages.")

🖥️ Output:
You should see the output as below:

✅ Yes, it is that simple!

DEV Community: Pooja Patel

How to get the length of a PDF file on AWS s3 using Python?