How do I secure PDF before sharing?

Open the file locally, set a password, download the encrypted PDF, then email or upload it. Share the password separately via phone or SMS.

Can I make PDF secure for sharing without uploading?

Yes. Convertify4u encrypts in a browser Web Worker — create protected PDF online while bytes stay on your device.

How strong is the sharing encryption?

PDF-standard AES-128/256 or RC4 via pdf-lib. Use a strong passphrase and share it out-of-band for best secure PDF file sharing.

Does my file upload when I protect PDF document online?

No. Processing is 100% local. Your document never reaches our servers — nothing to store or auto-delete.

What if the recipient forgets the password?

They cannot open the file without it. Send a new encrypted copy with a fresh password, or keep an unencrypted backup yourself.

Is secure PDF before sending free?

Standard-sized PDFs lock free. Files over 100MB require Premium via Lemon Squeezy.

Protect PDF Cluster

Secure PDF for Sharing — Lock Before Send

About to email a contract or upload to Dropbox? Secure PDF before sharing with a password lock, enable secure PDF file sharing only for intended recipients, and secure PDF before sending — make PDF secure for sharing locally so you can create protected PDF online and protect PDF document online without uploading to a third-party server.

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Need the main tool? Protect PDF

How it works

1
Open the PDF to share
Select your attachment locally. pdf-lib Web Worker loads pages — secure PDF before sharing with zero server contact.
2
Set a share password
Choose a passphrase to send separately (SMS, phone call). Make PDF secure for sharing with AES/RC4 encryption.
3
Send the locked file
Download, attach to email or cloud link, and share the password out-of-band. Protect PDF document online in one session.

Use cases

Email attachment safety

Secure PDF before sending tax forms — if the email is intercepted, the attachment stays locked.

Cloud link hardening

Create protected PDF online before generating a public Google Drive or Dropbox link.

Client portal uploads

Make PDF secure for sharing on vendor portals that lack native encryption.

HR document distribution

Secure PDF file sharing for offer letters — passphrase via separate channel.

Problems we solve

Email is not encrypted

SMTP transit exposes attachments. Secure PDF before sharing so only passphrase holders read content.

Cloud link sprawl

Anyone with a link can download. Password-lock first, then share the link plus secret separately.

Upload-then-encrypt services

Tools that store your file before locking create retention risk. Local encryption means protect PDF document online without transmission.

Trust & privacy

Lock before first send

Encrypt locally, then share — secure PDF before sending without a server copy.

Bank-level PDF encryption

AES/RC4 per specification — recipients need Adobe, Preview, or any standard PDF reader plus your password.

Free standard sharing locks

Everyday secure PDF file sharing is free. Massive files need Premium.

Frequently asked questions

Protect PDF