Lock PDF
FreeAdd a password so only people with the key can open the PDF.
Protects the PDF with a password so it cannot be opened without it.
Drag files here
Single file · PDF files · Max 100 MB
Files stay on your device — processing runs in your browser. Recent files are kept locally for 1 hour. Recent files are kept locally for 1 hour.
Showcase
See Lock PDF in action
Add a password so only people with the key can open the PDF.
- Private — files never leave your device
- Results update in the browser as you work
- Works on desktop and mobile browsers
How to use Lock PDF
A simple flow from start to result.
Add input
Upload a file or enter options in the workspace
Configure
Adjust settings for this tool
Process
Runs locally in your browser
Save
Preview the result, then download if you want
FAQs
Answers to the questions people ask most about privacy, quality, limits, and Lock PDF.
Yes. Lock PDF is free for everyday use. It runs in your browser with no account required for this tool.
For this tool, processing stays on your device in the browser. Files are not uploaded to Tools2Easy servers, so there is nothing for us to store or delete later. Close the tab when you are done if you want the in-memory preview cleared.
No install and no account for free tools. Open the page, add your file or text, process, then download or copy the result.
Most PDF and utility tools keep content fidelity unless you choose a compress or lossy convert option. Always preview the result before downloading when a preview is available.
Accepted types for Lock PDF are listed in the upload area. Most browser tools work best under about 100 MB; very large files may fail or run slowly because your device does the work.
Yes, in modern mobile browsers (Chrome, Safari, Firefox, Edge). Large PDFs, images, or videos can be slower on phones because processing uses your device memory and CPU.
Browser tools depend on your device and file size — not a remote server queue. Close extra tabs, try a smaller file, or use a desktop browser if a large job stalls. If the tab crashes, the file was likely too heavy for available memory.
Yes. Results show in the workspace first. Download only when you are happy with the output. Use Compare on image/video results when you want to check against the original.
Use Unlock PDF when you know the password. Other PDF tools usually need an unlocked file. Lock PDF can add a password after you finish editing.
Because processing stays in your browser, files are not sent to Tools2Easy for this tool — a stronger privacy model than sites that upload then delete after an hour. You are still responsible for company policy; for highly regulated data, confirm your internal rules.
Many PDF tools accept more than one file (merge, compress, convert). The workspace shows how many files you can add. Order matters for merge — rearrange before you run the tool.
Unlock tools need the correct password. Tools2Easy cannot bypass unknown passwords — that would be insecure and is not supported.