How do I share a PDF securely?
Share it as a link rather than an attachment, put a password on the link, and send the password separately. A link can be changed or switched off later; an attachment cannot. If the PDF will be forwarded or saved, also put a password on the file itself, because a link password does not protect a downloaded copy. And keep anything truly secret out of PDFs you send: nothing stops a screenshot.
What do you need "secure" to mean?
| You want | How |
|---|---|
| Only the right people can open it | A password on the link, or on the PDF itself |
| You know who opened it | Ask for an email address before the PDF opens |
| You know whether it was opened | View counts on the link |
| They can read it but not easily save it | A view-only link with downloads turned off |
| You can take it back | A link you can switch off, not an attachment |
Share it as a protected link
On Droply, a PDF opens in a viewer with page thumbnails, on any phone or computer, with no account needed. Upload it at droply.so, then open the project in your dashboard with Update and go to Access Settings:
- Password (Plus): choose Password, type one and save. Visitors see a password screen first.
- Require email entry (Plus): visitors enter and confirm their email address before the PDF opens. You see who viewed it and can export the list.
- Disable Downloads (Pro): the download buttons disappear and the PDF can only be read in the browser.
Views are counted on every plan; on Plus you also get views per day, countries and the sites visitors came from. When you are done, click Archive: the link stops working at once, and you can restore it later.
Put a password on the PDF itself
Do this when the file will be downloaded, forwarded or stored, so the protection travels with it.
- Adobe Acrobat Pro: encrypt the PDF with a password required to open it.
- Preview on a Mac: add a password when you export the PDF; look for the Permissions or Encrypt option in the Export window.
- LibreOffice (free): export as PDF and set an open password under the Security tab.
PDFs can carry two kinds of password. The open password stops people reading the file. A permissions password only asks PDF apps to block printing or copying, and many apps ignore it, so do not count on it.
Sending it by email anyway?
An attached PDF can be forwarded, and you cannot take it back. If you have to attach it, put a password on the PDF and send that password by text message.
Gmail's confidential mode adds an expiry date and lets you revoke access later. It also blocks forwarding and downloading in Gmail itself, but recipients can still take screenshots.
The limits, honestly
- Nobody can stop screenshots or a phone camera. Turning off downloads stops casual saving, not a determined person.
- A password sent in the same email as the link protects nothing.
- If the PDF holds health, financial or legal data with rules attached, use the tools those rules allow. This guide is not legal advice.
For other kinds of files, see How to password-protect a file you share.