The Base64 Encoder & Decoder converts text to and from Base64, the encoding scheme that represents binary data as plain ASCII characters. Base64 is everywhere in modern development: data URLs for inline images, JSON Web Tokens (JWT), email attachments, HTTP Basic Auth headers and API payloads that must travel safely through text-only channels. This tool encodes and decodes full UTF-8, so accented characters, symbols and emoji round-trip correctly. The auto-detect mode inspects your input and decides whether to encode or decode for you, while manual Encode and Decode modes give you full control. Everything runs locally in your browser, so even sensitive tokens never leave your device.
How to Use the Base64 Tool
- Pick a mode: Auto detects encode vs decode automatically, or force Encode or Decode.
- Type or paste your text or Base64 string into the input area — the result appears instantly below.
- Click the copy button to copy the output, or Clear to start over.
Benefits and Use Cases
- Quickly inspect or build data URLs, decode JWT payloads, and debug API responses that contain Base64 fields.
- Full UTF-8 support means accented text and emoji encode and decode without corruption.
- Runs entirely in your browser, so confidential tokens or payloads are never sent to any server.