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GenZOffice › A free PDF editor app that keeps your files private

A free PDF editor app that keeps your files private

Most free PDF editors either stamp a watermark on the result or ask you to upload the document first. GenZOffice does neither. Page edits happen on your phone and save straight back to the file.

Every step runs inside the app on your own phone. The file is not uploaded to a server, no account is needed, and the whole thing works in aeroplane mode.

How to edit a PDF on your phone

  1. Open the PDFTap any file in the PDF tab to open it.
  2. Switch to editingOpen the editor from the viewer to work on pages.
  3. Rotate or delete pagesRotate a page that was scanned sideways, or remove pages you do not need.
  4. SaveChanges are written back to the file on your device.

What you can do today

Rotate individual pages, delete pages, read comfortably with night mode, zoom to four times, jump between pages, and lock a file with a password. Be clear-eyed about the boundary: this edits pages. Rewriting the body text of an existing PDF paragraph is not supported, and any app promising it on a phone is usually rebuilding your document from scratch and losing the layout.

Password protection that is actually strong

Protecting a file uses AES-256-CBC with an HMAC-SHA256 integrity check, and the key is derived from your password with PBKDF2-SHA512 at 100,000 iterations. The password never leaves the device, and there is no recovery — if you forget it, the file stays locked. Unlock with your fingerprint or face instead of retyping.

No watermark, no page limit

Free means free: no stamp on the output, no cap on pages, and no trial that expires. There is no advertising in the app either — it is funded entirely by voluntary donations.

Frequently asked questions

Is this PDF editor really free?
Yes — every feature, no subscription, and no watermark on saved files.
Can I edit the text inside a PDF?
Not the existing body text. You can rotate and delete pages, and protect the file with a password.
Do I need an account?
No. There is no sign-up, because there is no server.
Does it work without internet?
Yes. The only thing that needs a connection is loading ads.

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