Protect PDF
PDFకు పాస్వర్డ్
A password on your PDF (AES-256), and whether it can be printed or copied. Nothing is uploaded.
PDFకు పాస్వర్డ్ పెట్టడం (AES-256): మీ ఫోన్లోనే, ఏదీ అప్లోడ్ కాదు.
1 Your PDF
2 Its password
A second password to change the permissions (optional)
With it, you can change the permissions later in a PDF app. Left empty, ap7am makes a long random one on your device and tells no one, so the permissions below hold and nobody can change them. Either way, the password to open it is all anyone needs to read it.
3 What others may do
Screen readers may always read it aloud. Most PDF apps keep to these permissions, but a few ignore them: the password to open it is what keeps it private.
ap7am cannot recover a forgotten password: keep it safe.
Your locked PDF
How to put a password on a PDF
- Choose the PDF (or drop it on the box). If it already has a password, type it: your new one replaces it.
- Type the password to open it, twice. The bar under it says how strong it is.
- Choose what others may do with it: print it (in high quality, low quality, or not at all), copy its text, edit it, fill in its form.
- Tap Lock the PDF, then download or share it.
Everything happens in your browser: the PDF and the password are never uploaded to ap7am or anywhere else,
and the password is not saved. The new file keeps your PDF’s name, such as certificate-protected.pdf.
The lock
- AES-256, the strongest encryption a PDF can have (PDF 2.0’s). Without the password, the pages cannot be read at all: they are scrambled, not just hidden.
- Two passwords. The password to open it is the one you share. The owner password is only for changing the permissions later; if you leave it empty, a long random one is made on your device and shown to no one, so the permissions cannot be changed by anyone. Either way, the password to open it is all anyone needs to read the PDF.
- Checked before you get it. The locked file is opened twice on your device: it must refuse to open without the password, and open with it.
- Nothing else changes. The pages, text, fonts, pictures, links and form fields are copied exactly; the file is usually about the same size, often a little smaller.
What a password cannot do
Most PDF apps keep to the permissions (no printing, no copying), but some ignore them, and anyone who can open the PDF can take a photo of the screen. The password to open it is what keeps a PDF private: choose one that is hard to guess, and send it separately from the file (not in the same email or chat).
If the PDF’s author set limits of their own (a PDF that opens without a password but cannot be printed, say), your lock keeps them, unless you type its owner password.
Questions
I forgot the password. Can ap7am open it?
No. The password is never sent to ap7am, and there is no way into an AES-256 PDF without it: keep the password safe, and keep your original file.
Will it open on phones and in Adobe Reader?
Yes: Adobe Reader, Chrome, Edge, Firefox, Safari, and the PDF apps on Android and iPhone all open AES-256 PDFs with the password. Only old PDF apps (from before about 2010) cannot.
Can I use a Telugu password?
Yes, AES-256 takes any letters. But a password in English letters, numbers and symbols is easier to type on every phone and computer, so it is the safer choice.
Will a government portal accept a locked PDF?
Usually not: portals want PDFs they can open. Lock a PDF to send it to a person; to upload a locked PDF, take the password off first with Unlock PDF.
My PDF is signed digitally. Can I lock it?
You can, but locking changes the file, so PDF apps will say the signature is no longer valid. Keep the original where the signature is checked.
Is my PDF uploaded or stored?
No. It is locked in your browser; nothing is sent to ap7am or anywhere else.
To take a password off a PDF you can open, use Unlock PDF. To hide details such as an Aadhaar number for good, use Redact PDF.
Made with qpdf (Apache 2.0 licence), compiled to WebAssembly, and Mozilla’s pdf.js (Apache 2.0 licence), both running in your browser. Licences.
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Locked on your device: your PDF and password are never uploaded. ap7am cannot recover a forgotten password: keep it safe.
