Base64 Encode/Decode

Convert between plain text and Base64 with strict validation

Base64 Converter STRICT MODE

Plain Text

Base64

Strict Mode Information

This tool enforces strict Base64 validation:

  • Only allows characters A-Z, a-z, 0-9, '+', '/', and '='
  • Validates proper padding (length must be multiple of 4)
  • Rejects any malformed Base64 input during decoding

Base64 is a binary-to-text encoding scheme that represents binary data in an ASCII string format. This tool performs all conversions in your browser - no data is sent to any server.