信頼できる Time Stamp Authority(TSA) サーバーを使用して、RFC 3161ドキュメントのタイムスタンプをPDFに追加します。文書が特定の時点で存在していたことを証明します。証明書は必要ありません。
Internet connection required
Timestamping requires contacting the selected TSA server to obtain a trusted timestamp token.
クリックしてファイルを選択します またはドラッグ&ドロップ
PDFドキュメント
ファイルがデバイスの外に出ることはありません。
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Select the PDF document you want to timestamp
Select one of the trusted TSA servers
Apply the RFC 3161 timestamp and download your timestamped PDF
A document timestamp (RFC 3161) is a cryptographic proof that your PDF existed at a specific point in time. A trusted Time Stamp Authority (TSA) server signs a hash of your document along with the current time, creating a tamper-evident timestamp embedded in the PDF.
No. Unlike a digital signature, a document timestamp does not require a personal certificate. The TSA server provides the trusted timestamp using its own certificate.
No. Only a cryptographic hash (SHA-256) of your document is sent to the TSA server. Your actual PDF content never leaves your browser.
Yes. The tool creates a standard RFC 3161 document timestamp (ETSI.RFC3161 SubFilter) that is recognized by Adobe Acrobat and other major PDF viewers.