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Understanding and Resolving Invalid Length for a Base 64 Char Array

An "Invalid length for a Base-64 char array or string" error arises when attempting to decode a Base64 string that has an incorrect length. Base64 encoding requires the input length to be a multiple of 4. Padding with '=' characters ensures this, as each '=' represents a missing byte. Common causes include accidental truncation, missing padding, or inclusion of non-Base64 characters. To resolve this, verify the input string's integrity, ensure proper padding if needed, and strip any invalid characters. If dynamically generating the Base64 string, double-check encoding logic. Many programming languages offer functions to automatically handle padding, so leveraging those can prevent length issues.

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