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Base64 Decoder

Decode Base64 back to text.

What Is a Base64 Decoder?

The Base64 Decoder converts Base64-encoded text back into its original plain text. This is the inverse operation of Base64 encoding and is commonly used to inspect email MIME parts, decode JWT segments, and recover data embedded in text protocols. This free online tool is useful for Base64 decoder, decode Base64 online, Base64 to text. Common use cases include JWT inspection, API payloads, MIME data, data URIs, and encoded text. It is designed for quick browser-based hashing, encoding, decoding, encryption testing, checksum comparison, identifier generation, and cryptography education. For production security, follow the algorithm's current standards, key-management requirements, and application-specific security guidance.

How to Use This Base64 Decoder

  1. 1
    Choose the operationSelect encode or decode according to the data you have.
  2. 2
    Paste the inputEnter the text or Base64 value into the input field.
  3. 3
    Check the formatFor Base64url, use the URL-safe '-' and '_' alphabet.
  4. 4
    Review the resultThe converted data appears immediately in the browser.
  5. 5
    Copy the outputUse it in your API test, JWT inspection, data URI, or development workflow.

Frequently Asked Questions

Common causes are whitespace, a missing/incorrect number of '=' padding characters, or characters outside the Base64 alphabet (+, /, alphanumerics). Removing line breaks usually fixes it.
Yes. This tool decodes UTF-8, so emoji and non-Latin scripts are recovered correctly as long as the data was encoded as UTF-8.

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