Base64 to ASCII Converter

Decode Base64 strings to ASCII text. Characters outside the printable ASCII range (0x20-0x7E) are replaced with ?. Need to encode? Try our Text to Base64 converter.

Output ASCII:

 
 
 
  
  
 
 
What is Base64 to ASCII?
 
Decodes Base64 strings to ASCII text. ASCII covers printable characters (0x20–0x7E). Non-ASCII bytes (e.g. UTF-8 multi-byte sequences) are replaced with ? so you get readable output without encoding errors.
 
What is it used for?
 
     
  • Legacy systems: View Base64 content when only ASCII is supported
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  • Debugging: Quickly inspect Base64 payloads without UTF-8 handling
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  • Compatibility: Avoid encoding issues in terminals or old tools
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  • Sanity check: See if Base64 contains mostly text vs binary
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When to use Base64 to Text instead
 
For full Unicode (emojis, non-Latin scripts), use Base64 to Text. That preserves UTF-8. This tool is for ASCII-only or when you want non-ASCII replaced with ?.
 
 
 
 

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