透過可信賴的 TSA 伺服器為您的 PDF 新增 RFC 3161 時間戳記。證明您的文件在特定時間點存在。無需憑證。
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Timestamping requires contacting the selected TSA server to obtain a trusted timestamp token.
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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.