How to decrypt an old password-protected pdf
- Step 1Locate the old password in your records — Check your password manager, email history, or documentation for the original password.
- Step 2Upload the archived PDF — Drop it into the remove password tool.
- Step 3Enter the password — Type the recovered password to decrypt.
- Step 4Save the unlocked version — Replace or alongside the protected original in your archive.
Frequently asked questions
What encryption was used in older PDFs?+
PDFs from before 2008 often used RC4-128-bit encryption. Modern PDFs use AES-128 or AES-256. This tool handles all common encryption standards.
Should I keep the original protected copy?+
If the document is sensitive, keeping only the unprotected copy in an unsecured location is a risk. Store the unlocked version in a secured, access-controlled archive.
What if the password no longer works?+
Passwords don't expire — if the password doesn't work, it may have been recorded incorrectly. Check for case differences or special character variations.
Privacy first
All PDF processing runs locally in your browser using PDF-lib and pdf.js. No file is ever uploaded — only metadata counters are saved for signed-in dashboard stats.