PDF Encryption Info Tool
Drop a PDF in and 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 near the start of the file describing the encryption. V is the algorithm version (1, 2, 4 or 5). R is the revision (2, 3, 4, 5 or 6). Length is the key length in bits (40, 128 or 256). CFM is set on V=4 and V=5 to indicate the cipher: AESV2 is AES-128, AESV3 is AES-256.
These fields identify the encryption tier. The mapping to Hashcat modes (10400 to 10700) is direct and documented in Adobe's PDF Reference; this tool implements it from the parsed dictionary.
Want to actually recover the password?
Once you know the mode, recovery feasibility is predictable. Run a free analysis to see what is possible on your specific file.
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