一文教你如何使用Python破解PDF的文本限制

pip install pikepdf

import pikepdf
import os
def unlock_pdf_with_pikepdf(input_path, output_path):
    """使用 pikepdf 解除 PDF 的权限限制"""
    try:
        pdf = pikepdf.open(input_path)
        pdf.save(output_path)
        print(f"成功！已将解除限制的PDF保存至: {output_path}")
    except Exception as e:
        print(f"处理失败: {e}")
# 使用示例
unlock_pdf_with_pikepdf("受限制的文件.pdf", "已解锁的文件.pdf")

import subprocess
def decrypt_pdf_with_qpdf(input_path, output_path, user_password):
    """使用 qpdf 命令行工具解密已知密码的 PDF"""
    try:
        subprocess.run(
            ['qpdf', f'--password={user_password}', '--decrypt', input_path, output_path],
            check=True, capture_output=True, text=True
        )
        print(f"解密成功！结果保存在: {output_path}")
    except subprocess.CalledProcessError as e:
        print(f"qpdf 处理失败: {e.stderr}")
    except FileNotFoundError:
        print("未找到 qpdf 命令，请确保已安装并配置了环境变量")
# 使用示例
decrypt_pdf_with_qpdf("加密的文件.pdf", "已解密的文件.pdf", "your_password")

pip install PyPDF2

from PyPDF2 import PdfReader, PdfWriter
def unlock_pdf_with_pypdf2(input_path, output_path):
    """使用 PyPDF2 解除 PDF 的权限限制（针对无加密文件）"""
    try:
        reader = PdfReader(input_path)
        writer = PdfWriter()
        for page_num in range(len(reader.pages)):
            writer.add_page(reader.pages[page_num])
        with open(output_path, 'wb') as output_file:
            writer.write(output_file)
        print(f"成功！已将解除限制的PDF保存至: {output_path}")
    except Exception as e:
        print(f"处理失败: {e}")
# 使用示例
unlock_pdf_with_pypdf2("受限制的文件.pdf", "已解锁的文件.pdf")

pip install aspose-pdf

import aspose.pdf as pdf
def unlock_pdf_with_aspose(input_path, output_path):
    """使用 Aspose.PDF 解除 PDF 的所有权限限制"""
    try:
        document = pdf.Document(input_path)
        document.document_info.privileges = pdf.facades.DocumentPrivilege.ALLOW_ALL
        document.save(output_path)
        print(f"成功！已将解除限制的PDF保存至: {output_path}")
    except Exception as e:
        print(f"处理失败: {e}")
# 使用示例
unlock_pdf_with_aspose("受限制的文件.pdf", "已解锁的文件.pdf")

pip install pdfunlock

# 基础用法：创建带有 "-unlocked" 后缀的新文件
pdfunlock your_protected.pdf
# 高级用法：递归处理一个文件夹内的所有PDF
pdfunlock /path/to/your/folder -r
# 更多选项
pdfunlock --help

pip install pdf2image pytesseract
# 同时需要安装系统工具：
# - Tesseract-OCR: https://github.com/tesseract-ocr/tesseract
# - Poppler: https://github.com/oschwartz10612/poppler-windows/releases/

import pytesseract
from pdf2image import convert_from_path
def ocr_pdf_and_save(input_path, output_path):
    """将扫描版PDF每页转换为图片，再通过OCR识别文字，保存为新的PDF"""
    try:
        images = convert_from_path(input_path, dpi=300)
        pdf_writer = PdfWriter()
        for image in images:
            custom_config = r'--oem 3 --psm 6'
            text = pytesseract.image_to_string(image, lang='chi_sim+eng', config=custom_config)
            print(f"识别出的文本: {text}") # 你可以在这里处理文本
            # 注意：此示例仅展示文本识别，如要生成可搜索PDF，需使用pdf2image将带文字的图片重新组合
        print(f"OCR识别完成！共处理 {len(images)} 页。")
    except Exception as e:
        print(f"OCR处理失败: {e}")
# 使用示例
ocr_pdf_and_save("扫描版的文件.pdf", "ocr_output.txt")

pip install spire.pdf.free

from spire.pdf import *

doc = PdfDocument()
doc.LoadFromFile("Secured.pdf")

for i in range(doc.Pages.Count):
    page = doc.Pages[i]
    textExtractor = PdfTextExtractor(page)

    extractOptions = PdfTextExtractOptions()
    extractOptions.IsExtractAllText = True

    text = textExtractor.ExtractText(extractOptions)

    with open(f'output/TextOfPage-{i+1}.txt', 'w', encoding='utf-8') as file:
        lines = text.split("\n")
        for line in lines:
            if line != '':
                file.write(line)

doc.Close()