Timestamps protect the integrity of your PDF file by communicating with an independent and trusted authority.
1. Open MobiPDF and tap Tools → Fill & Sign.
2. Choose a PDF file from your internal storage or preferred cloud service.
3. Tap Timestamp from the submenu.
4. Type your timestamp’s server URL.
5. Tap Done to confirm your choice.
Tapping Details will reveal additional digital signature options such as the digest algorithm currently in use, the signer’s name, the location and timestamp server information, and more. You can also lock your PDF after signing to prevent further edits.
Tapping Profiles will show a list of all timestamps you've placed through the app.
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