Home › Base64 Encoder/Decoder

Base64 Encoder & Decoder

Encode plain text to Base64 or decode a Base64 string back to readable text. All processing happens locally in your browser.

Plain Text Input

Base64 Output

Related Dev Tools

JSON Formatter

Format, validate, and minify your JSON payloads instantly with syntax highlighting.

Try Tool

URL Encoder

Encode text and URLs into a safe format for web transmission, or decode back.

Try Tool

What is Base64?

Base64 is a binary-to-text encoding scheme that represents binary data as printable ASCII characters. It's widely used in:

Email: Encoding attachments in MIME.
Web: Embedding images as data URIs in HTML/CSS.
APIs: Transmitting binary data in JSON payloads.
Authentication: HTTP Basic Auth headers.

How does it work?

Base64 converts every 3 bytes of input into 4 ASCII characters, resulting in roughly a 33% increase in size. The output uses characters A-Z, a-z, 0-9, +, /, and = for padding.

Is my data secure?

Yes. All encoding/decoding happens 100% in your browser. No data is ever transmitted to any server.