Support
Need help with Cert Sign? Email support and include enough detail so we can reproduce the issue quickly.
Contact: ge0rg3os@gmail.com
For privacy or support questions, contact us at ge0rg3os@gmail.com
Secure PDF signing on iPhone
Sign PDFs with your certificate or by hand
Import a .p12 or .pfx certificate, place a visible signature on the page, and export a signed PDF copy without changing the original file.
Helpful details to include
- Your iPhone or iPad model and iOS version.
- Whether you were signing with a certificate or a handwritten signature.
- What kind of file you opened, plus a screenshot or exact error message if available.
Common questions
Does Cert Sign require an account?
No. The app signs PDFs locally and does not require a login.
Where is my certificate stored?
Your imported certificate stays on your device. Optional saved passwords are stored in the iOS Keychain.
Can you recover my certificate password?
No. If the password is forgotten, you need to re-import the certificate with the correct password.