Signature PDF

Signature PDF is an open-source web application for signing and manipulating PDF documents directly in the browser. It supports both solo signing and shared multi-signer workflows, alongside common PDF organization and optimization tools.

Key Features

• Add signatures, initials, stamps, text, strike-through annotations, and watermarks to PDFs
• Multi-signature workflow via a shared link (optional server-side PDF storage)
• Page organization tools: merge, reorder, rotate, delete, extract pages, and generate booklets
• PDF optimization: compress PDFs to reduce file size
• Edit PDF metadata (add, modify, or remove predefined fields)
• Optional server-side encryption for stored PDFs using a symmetric key known to signers
• Optional server-side digital signature using certificate tooling (NSS database and pdfsig)

Use Cases

• Collect signatures from multiple people on the same document using a shareable link
• Prepare PDFs by merging files, extracting pages, and standardizing page layout before sending
• Reduce PDF size for email delivery or archiving while retaining a usable document

Limitations and Considerations

• Multi-signature mode requires storing PDFs on the server, which impacts storage and retention planning
• Digital signature support depends on additional system tools and certificate setup on the host

Signature PDF is well-suited for organizations that need a lightweight, browser-based PDF signing and editing workflow. It combines signing, page management, metadata editing, and compression in a single self-hostable interface.