Type or paste into the box, then click Encode or Decode; the result appears in the output box, and a decode error is shown inline instead of failing silently.
Base64 Encoder
Encode text to Base64 or decode a Base64 string back to text, right in your browser. Encoding uses the browser's own btoa and atob, so nothing you paste is uploaded and no account is needed.
When to use it
- Inspect a Base64-encoded token to read what it holds.
- Prepare a data URI to embed inline in HTML or CSS.
- Decode a Base64 payload returned by an API response.
How the encoding works
How the encoding works in Base64 Encoder: the encoder is UTF-8 safe, so accented characters and non-Latin text round-trip correctly. If you paste a string that is not valid Base64, the decoder shows an error inline instead of failing silently - text only, no file upload, and nothing leaves this browser tab.
For worked examples on each use case - embedding in HTML, inspecting tokens, and decoding API payloads - see the Base64 encoder guide.
Frequently Asked Questions
What does Base64 Encoder do?
Encode text to Base64 or decode a Base64 string back to text.
When should I reach for base64 encoder?
Use it to inspect a Base64-encoded token, prep a data URI, or decode a payload from an API response.
What complementary tools work well alongside base64 encoder?
For images rather than text, use Image to Base64 and Base64 to Image. The JSON parser and URL decoder cover the other encode and decode tasks that come up in the same workflow.