Add a password to an unlocked PDF and download a protected copy in your browser.
Free, fast, and secure
Add a password to any PDF with this free lock PDF tool. Choose a strong password, protect your file, and download the encrypted copy in seconds. Processing runs entirely in your browser with no uploads to third-party servers.
Password-protecting PDFs helps when sharing contracts, financial statements, medical records, or client deliverables. A locked PDF blocks casual opening before you email or store sensitive documents.
To remove protection from a file you own, use PDF Password Remover. For bulk image and video compression offline, download Compresso for Mac or Windows. PDF size issues: try Compress PDF first.
Download the app and compress up to 200 images and videos at once with no file size limits. Get access to advanced compression and batch processing features.
Free to download • 100% offline