Privacy & protection

Why scanned, image-only PDFs can't be searched, filled, or redacted by text, and how the Make searchable tool adds a selectable text layer with on-device OCR in 24 languages.

How AttachKit treats password-protected PDFs: permission-protected files unlock automatically on your device, files with a real open password go through the Unlock tool, and in both cases the file and password stay in your browser.

What happens to your PDF when you use AttachKit: every tool processes the file inside your browser, the only exception is the end-to-end-encrypted send-for-signature flow, and every claim is something you can check yourself.

Add an open password and AES-256 encryption with print, copy, and edit permissions to a PDF using AttachKit's Protect tool, entirely in your browser.

Auto-detect SSNs, names, addresses, and other PII with AI, choose categories and a mask style, and permanently remove the text from a PDF using AttachKit's Redact tool, entirely in your browser.

Strip a PDF's hidden author, title, dates and software metadata — plus embedded JavaScript, attached files and auto-run actions — entirely in your browser, and download a clean copy.

Remove the open password from a PDF you already know the password for, entirely in your browser, and download an unlocked copy.

Step-by-step guide to scanning any PDF for metadata anomalies, suspicious producer fingerprints, and AI-generation tells — free, entirely in your browser, with no upload.

Fixes for common problems when password-protecting a PDF in AttachKit, including already-encrypted files, corrupt PDFs, the 100 MB limit, engine load errors, and viewers that ignore permission flags.

Fixes for common problems when redacting a PDF in AttachKit, including encrypted files, scanned PDFs with no text layer, filled form fields the scan can't see, redactions that remain selectable, AI limits, and oversized files.

Fixes for the most common problems when removing metadata from a PDF: password-protected files, files reported as already clean, corrupted PDFs, the 100 MB cap, forms that stop calculating, and personal details that remain visible on the page.

Fixes for common Scan problems — password-protected PDFs, files that won't parse, legitimate documents flagged as suspicious, doubtful files that come back clean, and the 100 MB limit.

Fixes for the most common problems when removing a PDF password: a rejected password, a file that isn't actually encrypted, invalid or corrupt files, image-only output, and the 100 MB size cap.