Đóng dấu thời gian PDF
Nhúng dấu thời gian bảo mật RFC 3161 vào tài liệu PDF để xác minh thời gian tạo và chống giả mạo.
Tải lên PDF để đóng dấu thời gian TSA
Giới thiệu về công cụ này
Timestamp PDF adds a local timestamp certificate to your PDF documents, creating a self-signed proof that a document existed at a specific point in time.
The timestamp is generated locally in your browser using a self-signed certificate. This is not an RFC 3161 trusted timestamp from a certificate authority.
All processing happens entirely in your browser. Your documents never leave your device.
Cách sử dụng
Upload PDF Document
Select the target PDF file you want to timestamp.
Select TSA Server
Choose a trusted global Time Stamping Authority from the list.
Apply and Timestamp
Click Timestamp to fetch secure response from TSA and embed the token.
Trường hợp sử dụng
Intellectual Property
Establish clear priority proof of patents, drafts, and ideas before public release.
Financial Auditing
Provide certified tamper-proof logging of ledger archives and balance reports.
Legal Contracts
Lock legal agreements with a trusted time proof to avoid backdating arguments.
Câu hỏi thường gặp
What is a trusted timestamp (RFC 3161)?
An RFC 3161 timestamp is a cryptographically signed token issued by a recognized third-party authority (TSA) that links a document hash to a specific, verified clock source.
Do I need a digital certificate?
No, the cryptographic signature is provided directly by the trusted TSA server, making the process effortless for document owners.
Does the TSA see my document contents?
Never. The tool only sends a secure SHA-256 hash of your document to the TSA server, keeping your actual document completely private.