Base64 Decoder
Decode Base64 encoded text back to its original format instantly
Invalid Base64 format. Base64 should only contain A-Z, a-z, 0-9, +, /, and = for padding.
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Base64 Format
Base64 encoding uses 64 characters: A-Z, a-z, 0-9, +, and /. The = character is used for padding to ensure the encoded string length is divisible by 4.
Valid Base64 characteristics:
- Length divisible by 4
- Only contains valid Base64 characters
- Padding with = only at the end
- Maximum 2 padding characters
Common Base64 Decoding Issues
❌ Invalid Characters
Base64 should only contain A-Z, a-z, 0-9, +, /, and = for padding.
📏 Length Issues
Valid Base64 strings have lengths divisible by 4.
🔧 Padding Problems
Padding (=) should only appear at the end, maximum 2 characters.