Base64 Decoder

Convert Base64 encoded data back to original format

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Paste Base64 encoded text to convert back to its original format.
Choose format or use auto-detection.

How to Decode Base64

Step-by-Step Guide:

  1. Paste your Base64 encoded text in the input field
  2. Select the Base64 format (or use auto-detect)
  3. Choose the output character encoding
  4. Click "Decode from Base64" button
  5. Copy or use the decoded result

Auto-Detection Features:

  • Format Detection: Automatically identifies Base64 variant
  • Binary Detection: Detects if result contains binary data
  • File Type: Identifies common file signatures
  • Validation: Verifies Base64 format integrity

Frequently Asked Questions

Base64 encoded text typically contains only letters (A-Z, a-z), numbers (0-9), and the characters + and /. It may end with one or two = characters for padding. The length is always a multiple of 4 characters. Our auto-detection feature can help identify Base64 content.

This might indicate that the original data was binary (like an image or file) rather than text, or the wrong character encoding was selected. Try different encoding options or check if the data represents a file that should be saved rather than displayed as text.

Base64 decoding can fail if the input contains invalid characters, has incorrect padding, or is corrupted. Make sure you've copied the complete Base64 string and try using the auto-detection feature to identify the correct format.