Get PDF Title by Max Font Size

PDFTitle_byMaxFont.py

import pdfplumber
import os
def get_max_font_text(file_path):
    max_font_text=""
    with pdfplumber.open(file_path) as pdf:
        page1=pdf.pages[0]
        page1_content=page1.chars
        font_size_list=[item['size'] for item in page1_content]
        max_font_size=max(font_size_list)
        char_with_max_size=[item['text'] for item in page1_content if item['size'>=max_font_size]]
        max_font_text=''.join(char_with_max_size)
        return max_font_text
def main():
    pdf_dir="D:/Downloads/"
    for pdf_file in os.listdir(pdf_dir):
        pdf_full_path=os.path.join(pdf_dir,pdf_file)
        if(os.path.isfile(pdf_full_path)):
            max_text=get_max_font_text(pdf_full_path)
            print(pdf_file+"\t"+max_text)
if __name__=="__main__":
    main()

Known Issue:

For certain pdf files, if one copy the text content from it and paste it into notepad, and only messy code is got.
For those pdf files, the above script won't work, it will only output some un-readable word in the format of (cid:xx).

• reason: could be missing the corresponding font in your computer for corresponding font used in the pdf.

Another solutions:

1. https://gist.github.com/hanjianwei/6838974
2. https://pypi.org/project/pdftitle/