Base64 to ASCII Converter [2025]

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Decode Base64 encoded strings to ASCII text. Includes options for UTF-8 decoding, URL-safe Base64, and handling of invalid characters.

✓ UTF-8 Support✓ URL-Safe Decoding✓ Invalid Character Handling

Base64 Input

ASCII/Text Output

Key Features

  • Decode Base64 strings to their ASCII text representation.
  • Supports both standard Base64 and URL-safe Base64 variations.
  • Includes UTF-8 decoding for handling international characters.
  • Option to ignore invalid characters or treat them as errors.
  • Choose between treating input as bytes (0-255) or standard ASCII (0-127).
  • Provides clear error messages for invalid Base64 input.
  • Includes example data for quick testing and demonstration.
  • Copy input and output.

Common Use Cases

Data Extraction

  • • Text from encoded data
  • • Configuration files
  • • API responses

Debugging

  • • Network traffic
  • • Log analysis
  • • Data inspection

Development

  • • Text processing
  • • Character encoding
  • • Data conversion

Frequently Asked Questions

What is URL-safe Base64?

URL-safe Base64 replaces the '+' and '/' characters with '-' and '_', respectively, making the encoded string safe for use in URLs and filenames.

Why use UTF-8 decoding?

UTF-8 decoding ensures that international characters and special symbols are correctly interpreted. If your Base64 data contains non-ASCII characters, UTF-8 is essential.

How are invalid characters handled?

You can choose to ignore invalid characters (those outside the selected ASCII range) or treat them as errors. Ignoring them allows for partial decoding, while treating them as errors provides stricter validation.

What's the difference between "Treat as Bytes" and standard ASCII?

"Treat as Bytes" allows characters in the extended ASCII range (0-255). Standard ASCII only includes characters 0-127. Choose "Treat as Bytes" if your data might contain extended ASCII characters.

Is my data secure?

All conversion happens directly in your browser. No data is sent to any server or stored anywhere.

Technical Details

ASCII Character Ranges

The ASCII standard defines several important ranges:

Control Characters (0-31):

  • 0: Null character
  • 7: Bell
  • 8: Backspace
  • 9: Tab
  • 10: Line feed
  • 13: Carriage return
  • 27: Escape

Printable Characters:

  • 32-47: Punctuation and symbols
  • 48-57: Numbers 0-9
  • 65-90: Uppercase letters A-Z
  • 97-122: Lowercase letters a-z

Extended Characters (128-255):

Extended characters include special symbols, accented characters, and other non-standard ASCII symbols. Their representation may vary depending on the character encoding.

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