Base64 Validator

This tool validates a Base64 string and decodes to a byte sequence, enabling quick verification of payload integrity. It supports both standard and URL-safe alphabets, and can ignore or enforce padding and whitespace according to settings. Conceptually it treats input as a coded representation of binary data and exposes structured outputs to help engineers triage encoding issues. The tool is valuable for API developers, security analysts, and data engineers who need deterministic validation results and a decode candidate for further processing. Unique value lies in explicit error reporting, including character position and padding notes, and in returning both decoded_text (when UTF-8 decodes cleanly) and decoded_length in bytes for easy metrics. Core features include alphabet validation, whitespace handling, padding rules, and robust decoding with clear failure signals; optional strict mode and URL-safe decoding extend applicability to varied data interchange scenarios. Typical use cases include validating tokens, payloads, or encoded logs, and inspecting decode results during integration testing.