Password Protect PDF
Add a password to your PDF so only authorised people can open it.
Drop your PDF here
or click to browse
Password Protect PDF Online — Encrypt PDFs with a Password
Password protect PDF files online for free with Breklo. Add strong AES encryption to any PDF document to prevent unauthorized access, restrict printing, block copying, and secure sensitive information. Our free PDF encryption tool runs entirely in your browser — your files never upload anywhere, making it the safest way to add passwords to PDFs.
Why password protect PDF files?
PDFs often contain confidential information: tax returns, medical records, legal contracts, financial statements, business plans, and personal identification. When you email these documents or store them in cloud services like Google Drive or Dropbox, anyone with access to the account or inbox can read them. Password protecting a PDF adds a critical layer of security — only people who know the password can open the file. Our PDF encryption tool uses industry-standard AES-256 encryption, the same protection used by banks and government agencies.
How to add password to PDF
Upload your PDF, enter a strong password (mix of uppercase, lowercase, numbers, symbols), confirm it, and click Encrypt. Breklo generates an encrypted PDF that requires the password to open. The encrypted output works with Adobe Acrobat, Preview, Foxit Reader, and every other major PDF viewer. Recipients simply enter the password when opening the file — no special software needed on their end.
PDF security for sensitive documents
Add passwords to tax returns before sharing with accountants, encrypt medical records before email transmission, protect legal contracts during negotiations, secure financial statements for board distribution, or shield personal identification scans during online applications. Our PDF password protector is faster than Adobe Acrobat for simple encryption tasks and completely free — no $20 monthly subscription required for basic security.
Browser-based encryption privacy
Breklo encrypts PDFs locally using WebCrypto APIs and PDF-lib. Your original PDF, your password, and the encrypted output never leave your browser. We never see your files, never store your passwords, and never log encryption events. This makes us the most private PDF encryption tool available — ideal when you need maximum confidentiality without trusting a third-party server with your sensitive documents.
Encrypt PDFs on any device
Our PDF password protection works on Windows, macOS, Linux, ChromeOS, iPhone, iPad, and Android. No installation, no plugins, no account. Add passwords to PDFs from anywhere — at home, in the office, while traveling, on mobile devices. Breklo is the universal solution for online PDF encryption.
How to use Password Protect PDF
Three steps. No installation, no account, no watermark.
Upload your file
Drag and drop, or click to browse. We support files up to 100 MB.
Pick your options
Choose the settings that fit your task. Defaults work well for most cases.
Download the result
Your file is ready in seconds. Download directly — no email, no account.