Lock PDF Online
Protect your PDF with a password in seconds. Keep sensitive documents private and share them only with the people you choose. No software to install, no watermarks.
Free to use · Works on any device · Files auto-deleted after processing
यहाँ ड्रैग और ड्रॉप करें या
फ़ाइल एक होनी चाहिए PDF
और साइज़ 15MB तक.
How it works?
Upload your file
Drag and drop your .pdf file, or browse from your device.
Set a password
Type the password you want to use to open the file.
Download your protected PDF
Save the locked file, share it, or store it safely.
Why choose our Lock PDF tool?
Password protection
Only people with the password can open your PDF.
Content stays untouched
Text, images, and layout remain exactly as they were.
100% free
No hidden fees, no watermarks, no account needed.
Fast results
Most files are locked in just a few seconds.
Works everywhere
Windows, Mac, Android, iPhone, or Linux. Any browser works.
Secure by design
Files are processed securely and deleted automatically.
Nothing to install
No Adobe Acrobat or desktop software needed.
Why lock a PDF?
Documents like contracts, bank statements, resumes, and ID copies often contain private information. Sending them without protection means anyone who gets the file can read it. Adding a password makes sure only the intended person can open it, which adds a simple layer of security when you email, upload, or store important files.
Who uses this tool?
Students
Protect personal records, transcripts, and submissions.
Job seekers
Secure resumes and ID documents before sharing them online.
Professionals
Keep contracts, reports, and client files confidential.
Business owners
Protect invoices, financial statements, and internal documents.
Supported formats
| Input | Output |
|---|---|
| .pdf (password-protected) |
FAQs
Is this Lock PDF tool really free?
Yes. It's free to use, with no watermark and no signup.
Will locking change my PDF content?
No. Only password protection is added. Text, images, and layout stay exactly the same.
What happens if I forget the password?
We can't recover or reset passwords, so keep it somewhere safe. Without the password, the file can't be opened.
How strong is the encryption?
Your PDF is protected with 256-bit AES encryption.
Can I lock a PDF on my phone?
Yes. It works on smartphones, tablets, and computers.
Are my files safe?
Yes. Files are handled securely and removed from our servers after processing.
Is there a file size limit?
Files up to 50 MB are supported.