PDFタイムスタンプ追加
PDF文書にRFC 3161に準拠したセキュアなタイムスタンプを追加します。作成日時の証明と改ざん防止に。
ファイルをここにドラッグ＆ドロップするか、クリックして選択してください
or
PDFをここにドラッグ＆ドロップします。自動ローカル復号化による暗号化 PDF を完全にサポートします。
Designed for Trust and Speed
PDFRunway handles your documents locally, keeping data secure and processing lightning-fast.
Easy to Use
Simple 3-step processes designed for speed, clarity, and non-technical users.
Fast & Reliable
High-performance local compilation keeps processing fast, secure, and responsive.
100% Secure
Your documents never leave your browser. Zero uploads, 100% client-side privacy.
Works Anywhere
Access the full suite on any browser, system, desktop, or mobile device.
使用方法
Follow these three simple steps to process your file in seconds.
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.
このツールについて
Timestamp PDF adds RFC 3161 compliant trusted timestamps to your PDF documents using external Time Stamping Authorities (TSA). It provides legally-binding mathematical proof that a document existed in a specific, unaltered state at a precise instant in time.
Select from global trusted TSA servers such as DigiCert, Sectigo, SSL.com, FreeTSA, or MeSign. No personal signing certificates are required to secure your documents against future tampering.
Supports fully secure local hashing before handshake, guaranteeing absolute document contents remain 100% confidential.
使用例
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.
よくある質問
Have questions? Find quick answers about this tool here.
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.
No, the cryptographic signature is provided directly by the trusted TSA server, making the process effortless for document owners.
Never. The tool only sends a secure SHA-256 hash of your document to the TSA server, keeping your actual document completely private.