PDF Encryption Info Tool
Drop a PDF in — its encryption parameters are parsed locally. The tool reports the algorithm version (V), revision (R), key length, crypt filter method, and the corresponding Hashcat mode. Nothing is uploaded.
What V, R, and Length mean
Every encrypted PDF has an "encrypt dictionary" — a small unencrypted block at the start of the file describing the encryption parameters. V is the algorithm version (1, 2, 4, or 5). R is the revision (2, 3, 4, or 6). Length is the key length in bits (40, 128, or 256). CFM (crypt filter method) is set on V=4 and V=5 to indicate the cipher: AESV2 = AES-128, AESV3 = AES-256.
These four fields uniquely identify the encryption tier. The mapping to Hashcat modes (10400-10700) is direct and documented in Adobe's PDF Reference. The tool above implements this mapping from the parsed encrypt dictionary.
Want to actually recover the password?
Once you know the Hashcat mode, the recovery feasibility is predictable. Run a free analysis to see what's possible on your specific file.
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