All PDF Tools
Everything you need to analyze, validate, optimize, and transform your PDF documents — completely free.
Analyze & Verify
验证元数据
FreeExtract and inspect PDF metadata including author, creation date, software used, and edit history.
验证PDF
FreeCheck PDF structure, integrity, and compliance with PDF/A, PDF/X, and PDF/UA standards.
AI检测
FreeDetect AI-generated content by analyzing metadata signatures, software fingerprints, and structural patterns.
检查签名
FreeVerify digital signatures embedded in PDF documents to confirm authenticity and integrity.
无障碍检查
FreeEvaluate PDF accessibility compliance including tagged structure, reading order, and alt text.
Optimize & Transform
压缩PDF
FreeReduce PDF file size by up to 80% with adjustable compression levels while preserving quality.
提取图片
FreeExtract all embedded images from PDF documents and download them as individual files or a ZIP archive.
Merge PDF
FreeCombine multiple PDF files into a single document with customizable page ordering.
Split PDF
FreeSplit a PDF into individual pages or custom page ranges for easy distribution.
PDF to Image
FreeConvert PDF pages to high-quality images in PNG or JPEG format.
PDF Password
FreeAdd password protection to secure your PDF, or remove passwords from locked files.
Metadata Editor
FreeEdit or completely remove metadata from PDFs — update author, title, subject, and keywords.