Free Base64 Encoder and Decoder
Encode any text to Base64 or decode Base64 back to plain text. Handles UTF-8 (emoji, accents, non-Latin scripts) correctly.
Try this example
A coworker sent you a string that starts with eyJ and looks like base64 garbage. You want to see if it\'s a JWT or some other base64-encoded payload.
Sample input
SGVsbG8sIOS4lueVjCEg8J+Ygg==
Steps
- 1Paste the string into the input box.
- 2Pick Decode mode.
- 3Read the output. If you see JSON like {"alg":"HS256","typ":"JWT"}, it's the header of a JWT. Switch to the JWT Decoder for a friendlier view.
Expected result
Hello, 世界! 😂How to use
- 01Paste your text or Base64 string into the input box.
- 02Pick Encode or Decode mode.
- 03Result appears below. Copy with one click.
FAQ
Why does Base64 make text bigger?▼
Base64 represents 3 bytes of binary data using 4 ASCII characters, so the encoded form is roughly 33% larger than the original.
When should I use Base64?▼
When you need to send binary data through a text-only channel (URLs, email, JSON, HTTP headers). It is not encryption: anyone can decode Base64.
Does this support UTF-8?▼
Yes. Emoji, accented characters, Chinese, Arabic, and other Unicode are all handled correctly via TextEncoder/TextDecoder.