About Base64 Encoder & Decoder
Base64 Encoder & Decoder converts UTF-8 text to standard Base64 or Base64URL and decodes either form back to readable text.
Base64 is an encoding, not encryption. The distinction matters when copying values into APIs, cookies, URLs, or test fixtures: the receiving system must expect the same alphabet, padding rules, and character encoding.
How to use this developer tool
- Choose text-to-Base64 or decode mode, then select standard Base64 or Base64URL when the option is available.
- Paste the value and check that the input is complete and uses the expected alphabet.
- Convert the value and compare the decoded text with the original before copying it into your application.
Privacy and data handling
Text is processed in the browser. Do not treat the local workflow as a permission to paste production tokens or personal data; Base64 values remain easy to decode and should not be used as a secret store.
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Frequently asked questions
What is the difference between Base64 and Base64URL?
Base64 uses plus and slash characters and commonly includes padding. Base64URL substitutes URL-safe characters and often omits padding.
Why do non-English characters need UTF-8?
UTF-8 gives the encoder a consistent byte representation for Unicode text, so decoding can reconstruct the original characters.
Is an encoded API key protected?
No. Anyone with the encoded value can decode it. Use a secret-management or encryption workflow when confidentiality is required.