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How to Use
- 1Enter your text or Base64 string in the input.
- 2Click Encode to convert text to Base64.
- 3Click Decode to convert Base64 back to text.
- 4Copy the result with one click.
About Base64 Encode/Decode
The Base64 Encoder/Decoder converts between plain text and Base64 encoding. Base64 is a binary-to-text encoding scheme that represents data using 64 ASCII characters (A–Z, a–z, 0–9, +, /), making it safe for transport through text-only channels.
Developers commonly use Base64 for embedding images as data URIs in HTML and CSS, encoding credentials in HTTP Basic Authentication headers, passing binary data in JSON payloads, and encoding email attachments via MIME. If you work with APIs, you have likely encountered Base64-encoded strings in authorization tokens or webhook payloads.
This tool handles Unicode text by first encoding it as UTF-8 before applying Base64 conversion, ensuring that characters outside the ASCII range (like accented letters, emoji, or CJK characters) are preserved correctly during round-trip encode/decode operations.
All encoding and decoding happens locally in your browser. No data is transmitted to any server, so you can safely decode JWT payloads, API keys, or any sensitive content without exposing it to third parties.
Frequently Asked Questions
What is Base64?
Base64 is a binary-to-text encoding scheme that represents data using 64 ASCII characters.
Does it support Unicode?
Yes, Unicode text is handled via UTF-8 encoding before Base64 conversion.
Is Base64 encryption?
No, Base64 is encoding, not encryption. It does not provide any security — anyone can decode a Base64 string.
Why is my Base64 output longer than the input?
Base64 encoding increases data size by approximately 33% because it represents 3 bytes of data as 4 ASCII characters. This trade-off is by design for text-safe transport.
Is my data sent to a server?
No. All encoding and decoding runs locally in your browser using native JavaScript functions. Your text never leaves your device — safe for API keys, tokens, and sensitive data.