YOUR DOCUMENTS. IN YOUR HANDS.
Protect PDF
Add password-based PDF protection.
Add a password to your PDF.
Choose one file. Nothing is uploaded until you continue.
.pdf · 10 MB maximum · 100 pages maximum
This tool uploads your file to BullPDF’s Cloudflare processing server. It runs in a temporary isolated container that is destroyed after the job. We do not keep a stored copy of your file.
Your PDF password is sent only in the encrypted upload body. It is not put in URLs, stored in the usage database or retained after processing.
One file per job · 3 attempts per hour · A daily service limit applies.
THREE SMALL STEPS
How to use Protect PDF
Start with your file.
Select .pdf files from your device. Use unencrypted documents within the limits shown above.
Check the upload notice.
Read the upload notice, then choose whether to send your file for temporary processing.
Take the result with you.
Download your PDF and review it before sharing. Files are not stored for later retrieval.
What should I check before sharing the result?
Reopen the downloaded file and check the pages, layout and any added text or form values. Font support and complex PDF features can vary. Standard overlay text supports common Latin characters; unsupported characters produce an error rather than being silently dropped. Existing digital signatures may no longer be valid after editing.