Security
JWT Decoder
Decode JWT headers, payloads and expiration data.
PopularLocal
Encoding
Base64 Encoder & Decoder
Encode text to Base64 or decode Base64 values instantly.
Convert UTF-8 text into a Base64-encoded value.
Local processing
Your text is encoded and decoded entirely in the browser. Nothing is uploaded.
About this tool
What is Base64 Encoder & Decoder?
Base64 represents binary or text data using a restricted set of printable characters. It is commonly used in APIs, email attachments, data URLs and configuration values. This tool supports UTF-8 text and processes everything locally.
Features
Built for fast developer workflows
- Encode UTF-8 text into Base64.
- Decode Base64 and Base64URL-compatible values.
- Support international characters and emoji.
- Swap input and output for quick round trips.
- Copy generated values with one click.
- Process all content locally in the browser.
Frequently asked questions
Questions about Base64 Encoder & Decoder
Is Base64 encryption?
No. Base64 is an encoding format and provides no confidentiality. Anyone can decode a Base64 value.
Why does Base64 increase data size?
Base64 represents every three bytes using four printable characters, producing approximately 33 percent additional size before other formatting overhead.
Does this tool support Unicode text?
Yes. Text is converted using UTF-8 before encoding and decoded back from UTF-8 afterward.
What is Base64URL?
Base64URL is a URL-safe variant that replaces certain characters and often omits padding. It is commonly used in JWTs.
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