Base64 Encoder & Decoder Online — Free Tool

Securely encode plain text into Base64 format, or decode Base64 strings back to their original readable state.

Input

Output

Privacy note: All processing happens entirely in your browser. No data is sent to our servers.

About this tool

Base64 encodes binary data as ASCII text safe for JSON, email, and URLs. Encode UTF-8 text to Base64 or decode Base64 back to readable strings locally.

Common for Basic auth headers, data URLs, and embedding small payloads in configs.

Common use cases

Decoding JWT payload segments (with JWT decoder for full token)
Encoding credentials for Authorization headers in dev
Moving binary through text-only channels
Debugging API fields that arrive Base64-wrapped

How to use

Choose encode or decode mode.
Paste plain text or Base64 string.
View output instantly.
Copy result into your client, script, or config.

This page is available at /tools/base64-encoder-decoder/.

Understanding the result

Encoded output is ~33% longer than original binary.
Padding equals signs (=) align to 4-character blocks—required for valid decode.
UTF-8 text should be specified before encode to handle emoji and non-Latin scripts.
Invalid Base64 characters cause decode errors—check for truncated copy-paste.