Troubleshooting Base64 Encoding Errors
Base64 encoding and decoding can fail in subtle ways. Learn how to diagnose padding errors, charset issues, and corrupted data.
Key Takeaways
- Decoding fails with 'Invalid character' or 'Illegal base64 character'.
- Decoding fails with 'Invalid padding' or produces garbled output.
- Decoded text shows question marks, boxes, or random characters.
- ### Cause Base64 output length must be a multiple of 4.
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Invalid Character Errors
Symptoms
Decoding fails with 'Invalid character' or 'Illegal base64 character'.
Cause
The input contains characters outside the Base64 alphabet. Line breaks, spaces, or URL-unsafe characters (+, /) in a Base64URL context cause this error.
Solution
Remove whitespace before decoding. Check if the data uses Base64 or Base64URL encoding and use the matching decoder.
Padding Errors
Symptoms
Decoding fails with 'Invalid padding' or produces garbled output.
Cause
Base64 output length must be a multiple of 4. Missing = padding characters at the end cause length mismatches. Some systems strip padding when transmitting.
Solution
Add padding to make the length a multiple of 4: len % 4 missing characters should be added as =. Some libraries handle missing padding automatically.
Garbled Unicode After Decoding
Symptoms
Decoded text shows question marks, boxes, or random characters.
Cause
The text was encoded with a different charset (e.g., UTF-16 or ISO-8859-1) than the decoder expects (typically UTF-8).
Solution
Try different charset interpretations of the decoded bytes. Check the source system's encoding configuration.
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