[Compress & security]
Shrink files, repair structure, validate, PDF/A, passwords, permissions, metadata, signatures.
- Compress PDF
Reduce PDF size while keeping readable quality.
- Repair PDF
Rewrite and optimize the PDF to fix common structural issues.
- Validate PDF
Check whether a PDF passes structural validation.
- PDF to PDF/A
Convert to PDF/A-1b, PDF/A-2b, or PDF/A-3b for long-term archival.
- Unlock PDF
Remove password protection: enter the open password and download an unencrypted PDF.
- Protect PDF
Add AES-256 password protection to PDFs.
- PDF permission editor
Encrypt with AES-256 and set printing, copying, editing, and form rights separately from passwords.
- Remove PDF metadata
Strip document info, XMP, and common hidden properties for privacy hardening.
- Validate PDF signatures
Check whether digital signatures in the PDF are cryptographically valid.
- Edit PDF metadata
Set title, author, subject, and keywords in the document info dictionary.