Add a password to keep a PDF private. Free, private and instant — right in your browser.
Browser tool coming soon. This conversion needs server-side rendering we keep private by default. Follow the step-by-step method below, or use one of our free in-browser tools that work instantly with no upload.
Quick answer: To protect pdf, use our free in-browser PDF toolkit. Upload your document, apply your changes and download the result — with no files ever leaving your device.
The Protect PDF is part of the PDFForge toolkit — a free suite of PDF utilities that run entirely in your browser. Add a password to keep a PDF private. Because there are no uploads, your documents stay completely private and the tool works even on slow connections.
Add a password to keep a PDF private. with no installation — open the page and start immediately.
Your PDF never uploads. Processing uses local browser technology only.
No subscriptions, daily limits or hidden fees.
Desktop, tablet and mobile — same tool, same privacy.
Whether you need a one-off conversion or handle documents daily, this tool saves time and keeps your files private. No waiting in upload queues, no account creation, and no risk of documents sitting on a third-party server.
Handle common document jobs quickly without desktop software.
Process files on any device with a browser — no IT install required.
Keep legal, medical or financial PDFs on your device only.
Cause: This format pair requires server-side rendering we have not enabled.
Solution: Follow the manual export steps on this page, then use our PDF utilities.
Prevention: Bookmark this page — we are adding more browser tools regularly.
Cause: No file selected or the file type is not supported.
Solution: Upload a valid PDF file using the drop zone above.
Prevention: Check the file extension before uploading.
Cause: The source PDF uses custom fonts, scans, or complex multi-column layout.
Solution: Try OCR for scanned PDFs, or simplify the layout in the source document first.
Prevention: Use text-based PDFs rather than image-only scans when possible.
Cause: Browser blocked the download or pop-up blocker is active.
Solution: Allow downloads for this site and click the download link again.
Prevention: Use an updated version of Chrome, Firefox, Safari or Edge.
Your PDF is processed entirely on your device. PDFForge does not receive, store or analyse your file content. This makes the Protect PDF suitable for confidential business, legal and personal documents.
| Feature | PDFForge | Adobe Acrobat | Smallpdf | iLovePDF |
|---|---|---|---|---|
| Price | Free, unlimited | From $12.99/mo | Free w/ limits | Free w/ limits |
| Files stay on your device | Yes | No | No | No |
| No upload required | Yes | No | No | No |
| Sign-up needed | No | Yes | For some tools | For some tools |
| Daily task limit | None | Plan-based | 2/day free | Limited free |
| Works offline (PWA) | Yes | No | No | No |
Use the tool above: upload your PDF, choose your settings and download the result. It is completely free with no sign-up or watermark.
Yes. Your PDF is processed locally in your browser and never uploaded, so your data stays private.
No. The Protect PDF works in any modern browser with no installation or registration.
Yes, the Protect PDF works on iPhone, iPad and Android as well as desktop.
No. You can protect pdf as many files as you like, free of charge.
There is no hard limit imposed by PDFForge. Practical limits depend on your device memory — most PDFs under 200 MB work smoothly.
Never. Output files are clean with no PDFForge branding or watermarks.
Yes. Because processing happens in your browser, sensitive contracts, financial records and personal documents never travel over the network.
Shrink PDF file size while keeping quality.
MCombine multiple PDFs into one document.
SSplit a PDF into separate pages or ranges.
RRotate every page 90, 180 or 270 degrees.
WStamp a custom text watermark on every page.
URemove restrictions and re-save an open PDF.
EReorder, rotate and assemble PDF pages.
OMake scanned PDFs searchable with OCR.