Protect PDF's upload step is configured with isMultipleInput set to false, so it accepts and encrypts only one PDF per submission.
Upload the first PDF file to the Protect PDF form.
Protect PDFProtect Multiple PDFs With Same Password
Type the chosen password into the password field.
Adobe's support community confirms Acrobat Pro's Action Wizard can batch-apply the same password to multiple PDF files at once through a saved Encrypt action, though it cannot set a different password for each file. password protect multiple pdf's - Adobe Community
Protect PDF's reset control clears the typed password along with the uploaded file, so the same password has to be retyped before locking the next PDF in a batch.
Save the locked file before moving to the next one in the batch.
Repeat the upload and password entry for each remaining PDF in the batch.
Verifying Batch Password Consistency
Open each downloaded PDF and enter the shared password to confirm access.
Count the encrypted files against your original list to catch any missed document.
Continue with Forgotten Password Recovery or Owner vs User Passwords.
Frequently Asked Questions about Protect Multiple PDFs With Same Password
How do I protect the next PDF in the batch?
Click the reset control to clear the previous file and password, then upload the next PDF.
Where do I type the password for each file?
Enter the same password into the password field after uploading each new PDF.
How do I confirm the password works on a finished file?
Open the downloaded PDF and type the shared password to verify access.
What should I do if the password field appears empty?
Retype the full password string before submitting the file for encryption.