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PDF Encryption
Drag files here orclick to upload
2 files, max 5M each
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Tool Description
PDF Encryption is a free-to-use online PDF encryption tool that is ready to use without installation or registration. It adds password protection to a PDF using strong encryption, effectively preventing unauthorized opening or tampering, ideal for sensitive documents, private data, and archiving. All processing is done locally in your browser, providing 100% privacy — your files are never uploaded to any server. Whether you are encrypting contracts, financial files, or personal data, it handles it all with ease — drag, type, and go, with security comparable to professional encryption software. (Note: the free tier refers to the daily free quota, not unlimited use; high-frequency or professional needs can unlock more via membership)
How to Use
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Upload File
Click the upload area or drag and drop a PDF file into the box; multiple files can be uploaded in batch
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Set Password
Fill in the password on the right and confirm it again, making sure both entries match
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Process & Download
Click the "Start Process" button and download the encrypted PDF when done
Use Cases
- Sensitive documents: add password protection to confidential files like contracts or financial reports
- Private data: encrypt PDFs containing personal information before sharing or transferring
- Archiving: add an extra layer of security to important documents kept long-term
Key Advantages
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Daily Free Quota
Enjoy free usage every day, covering everyday encryption needs at zero cost with full functionality
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Privacy & Security
All processing happens locally in your browser; your files are never uploaded to any server, protecting your data privacy throughout
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Strong Encryption
Uses strong encryption algorithms that effectively resist brute-force attacks and truly protect your files
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Batch Encryption
Upload multiple files in batch; each is encrypted with the same password and can be downloaded individually or as a ZIP
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Easy to Use
Just fill in a password to encrypt — up and running in seconds with no special knowledge needed
Password Protection Notes
Please note the following when setting and using password protection:
| Item | Description | Recommendation |
|---|---|---|
| Password Strength | Use a mix of letters, numbers, and symbols | Longer and more complex passwords are harder to crack |
| Password Storage | Encrypted files require the correct password to open | Keep it safe — a lost password cannot be recovered |
FAQ
No. An encrypted PDF requires the correct password to open, so please keep it safe.
Yes. Multiple files can be uploaded in batch; each is encrypted with the same password and can be downloaded individually or as a ZIP.
Passwords cannot be recovered. By design, passwords cannot be recovered. Please remember or store it safely — a lost password means the file cannot be decrypted.
Completely secure. Files are processed entirely in your local browser and never uploaded to any server, so your data is absolutely safe.
No. Encryption only adds password protection; page content and clarity remain unchanged.
Hardly. Encryption only adds a small amount of security information; the file size stays basically the same.
Very fast. Processing happens instantly in your browser with no upload wait — multiple files encrypt quickly.
Yes. This is a pure web app that works directly in the browser on phones, tablets, and computers with no installation required.
Free usage every day at zero cost. We provide a daily free quota for every user that easily covers light needs; upgrade to membership for higher processing capacity when needed.
Decrypt first. After entering the correct password to open the file, you can view and edit it normally; you cannot operate before decryption.
This tool uses one password for all. Every uploaded file is encrypted with the password you set, which is convenient for batch management.
Yes. Share the encrypted PDF and send the password separately to the recipient to securely share sensitive files.
Content last updated：2026-07-10
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