About Sign PDF & Cryptographic Signatures
FileLab Sign PDF is an executive-grade e-signing studio running entirely within your browser using WebAssembly and client-side PDF document manipulation. Your sensitive financial, employment, and legal agreements never leave your device or get sent to third-party servers.
Your document is modified locally in browser memory using HTML5 Canvas & pdf-lib.
Each signed export includes an embedded SHA-256 integrity hash and timestamp seal.
No signatures quotas, account registration, or watermarks.
Related PDF Tools Tools
More client-side utilities from this suite
PDF to Word
Preserves paragraphs, tables, and typography hierarchy.
PDF Merge
Combine multiple PDF documents into a single, organized file in seconds.
PDF to JPG
Extract and convert high-resolution image pages from any PDF document.
Image to PDF
Convert photos, scans, PNG and JPG images into clean PDF documents.