Protect PDF
Lock PDFs with user and owner passwords — control opening, printing, and copying. Protect 10 client files before sending — local pdf-lib encryption, unlimited saves.
Runs on pdf-lib
How to Use the Protect PDF
Similar Tools You Might Need
See allBulk PDF Protect
Add password protection to multiple PDF files in one batch. Set user and owner passwords to control access and permissions. Everything runs locally in your browser — nothing is uploaded.
eSign PDF
Sign PDFs electronically — draw, type, or upload signature images onto any page. Execute a 5-page agreement without printing — local pdf-lib + canvas, unlimited saves.
Bulk PDF Merger
Join up to 100 PDFs into one document per Pro run with order control and preserved links. Legal teams bind 40 exhibits into one filing — local pdf-lib merge, 2 free batches a day.
Image Resizer
Scale one image to exact pixel dimensions — width/height fields prefill from the source — with optional aspect-ratio lock, PNG/JPEG/WebP output picker, and quality control for JPEG/WebP. Files over 50MB are rejected; resizing runs on plain canvas drawImage locally.
Bulk Image Watermark
Stamp text or logo watermarks across dozens of photos with 5 positions and 10–100% opacity control. Photographers protect 200 wedding proofs before sharing — always exports PNG (<name>-watermarked.png) — local Canvas work, 2 free batches a day.
Frequently Asked Questions
User vs owner password — which?
User password gates opening; owner password restricts printing, copying, and editing. Client deliverables usually need both: open-secret for the client, strict owner rules against forwarding misuse.
How strong should passwords be?
12+ random characters for confidential files; PDF encryption resists casual opening but not nation-state cracking. Truly sensitive material needs stronger containers.
Can recipients remove protection?
Anyone with the owner password can — that is by design. Protection deters casual misuse; it never survives a determined recipient with credentials.
Are my files or passwords uploaded?
No — encryption runs locally in your browser. Passwords never leave your device; only the final save touches the network — downloads are unlimited.
Related Pdf Tools
HEIC to PDF
Converts HEIC files to PDF format — Apple device photos to document sharing, printing, and archival with consistent formatting. All conversion happens locally in your browser with no file size limits.
PDF to Word
Extracts PDF text into a Word-readable .doc file (HTML-based), one paragraph per detected line. Tables, columns, images, and the original layout are not preserved — review complex documents after conversion.
PDF Compressor
Trims PDF file size by stripping redundant metadata and optimizing object streams — best on text-heavy documents. Cannot recompress embedded images (the main size driver); for scan-heavy PDFs use Bulk PDF Size Reducer. Handles PDFs up to 125MB.
Word to PDF
Converts .docx files to PDF entirely in your browser — text runs extracted into clean plain-Helvetica pages. No server, no LibreOffice fidelity: complex formatting, tables, and images do not carry over.
JPG to PDF
Convert JPG images to PDF format in your browser. Documents stay on your device — editing and conversion run locally in your browser.
PDF to JPG
Convert PDF images to JPG format in your browser. Documents stay on your device — editing and conversion run locally in your browser.
Last updated October 2026