Recover access to a password-protected PDF you own. Fast Check runs every password base, mutation and date pattern first, while targeted recovery supports encryption from legacy RC4 through modern AES-256. Review proof before choosing a paid result.
All encryption types
High-performance GPU cluster
Results within 24h
Any PDF creator supported
Unlock File option available for 24 hours after your result
Quick answer
First identify the PDF protection
PDF documents can use different encryption versions or a permissions password. Uploading the file lets us identify the protection first and show the recovery path that fits it.
Recovery process
How it works
1
Upload Your PDF
Upload your password-protected PDF through our TLS 1.3-encrypted upload form. Our system automatically detects the PDF version, encryption algorithm (RC4-40, RC4-128, AES-128, or AES-256), key length, and estimates recovery difficulty. A Fast Check runs immediately against every password base, mutation and date pattern for your file type.
2
Server-Powered GPU Recovery
Your file enters our dedicated GPU compute cluster. Depending on the encryption type, we deploy dictionary attacks with intelligent word-mangling rules, mask attacks targeting known patterns, brute-force for short key spaces, and a Deep Recovery + AI mode for complex AES-256 files. Legacy 40-bit RC4 PDFs are cracked in approximately 5 minutes using precomputed lookup tables.
3
Get Your Password
Once the password is found, you receive it via email immediately. You only pay the success fee ($49.99) if we successfully recover your password — no recovery, no charge. Fast Check runs against every password base, mutation and date pattern for your file type. Your PDF content is never viewed, stored, or accessible to anyone during the process.
Legacy Encryption (Fast Recovery)
Older PDF formats can follow a different recovery path than newer documents. The encryption type is identified from the file before a recovery option is offered.
40-bit RC4 (Acrobat 2-4, 1994-2000) — cracked in minutes with precomputed Thunder Tables. 100% guaranteed success.
128-bit RC4 (Acrobat 5-6, 2000-2003) — RC4 has known statistical weaknesses; dictionary and mask attacks are highly effective.
40-bit guaranteed 100% success — we have never failed to recover a 40-bit RC4 PDF. If we cannot crack it, there is no charge.
Modern Encryption (Variable Recovery Time)
Modern PDF protection is designed to resist broad guessing. Any details you remember can make a targeted search more relevant.
AES-128 (Acrobat 7-9, 2004-2008) — secure algorithm but password validation uses a single SHA-256 round. GPU-accelerated dictionary attacks can test millions of candidates per second.
AES-256 (Acrobat X+, 2010-present) — uses PBKDF2 with SHA-256 and 48-byte random salt. Each password attempt is computationally expensive, requiring tens of thousands of hash iterations.
Password hints dramatically improve success rates. If you remember any fragment — a theme, a year, a pet name — our Deep Recovery + AI mode incorporates that into custom attack rules.
Two PDF protection cases, tested separately
One controlled PDF requires an open password. The other opens with an empty user password and has owner permissions. They require different decisions before choosing recovery.
PDF_OPEN: correct-password and wrong-password controls passed; local format extraction passed.
PDF_OWNER_ONLY: correct-password and wrong-password controls passed; local format extraction passed.
Controlled files created by LostMyPassPro; checked 2026-10-03. These checks measure compatibility and verification, not production password-search success, recovery speed or customer win rate.
