Base64 Encoder / Decoder

Encode standard text to Base64 formatting strings or decode Base64 back.

About the Base64 Encoder & Decoder

Base64 is a fundamental data encoding scheme used constantly in web development to reliably convert binary data or complex text strings into a safe, standard ASCII format that can be transmitted over the internet without data corruption. Our Base64 Encoder / Decoder is a secure, bi-directional developer utility that instantly translates your plain text into a Base64 string, or decodes a raw Base64 string back into human-readable text. Because the encoding and decoding logic is executed entirely within your local browser using native JavaScript APIs, your sensitive API keys, auth tokens, or private data never leave your computer.

How to Encode or Decode Text

  1. Paste your raw plain text OR your existing Base64 encoded string into the top text box.
  2. Click 'BASE64 ENCODE' to convert standard human-readable text into a Base64 string.
  3. Or, click 'BASE64 DECODE' to translate an existing Base64 string back into readable text.
  4. The result instantly appears below. Click the 'COPY RESULT' button to send it to your clipboard.

Who Uses This and Why

Software engineers use this tool constantly to quickly encode API credentials for Basic Authentication headers (e.g., Authorization: Basic <base64>) or to decode encrypted JWTs (JSON Web Tokens) to inspect their local payload data. Frontend web designers use it to encode small SVG icons or fonts directly into Base64 CSS background images, which reduces HTTP requests and speeds up their websites. IT professionals also use it to safely transmit complex bash scripts over email without triggering spam filters or accidentally corrupting special characters.

Frequently Asked Questions

Is Base64 the exact same thing as encryption?

No, Base64 is strictly a data translation encoding format, not a cryptographic encryption algorithm. It does not use a secret key, salt, or password. Anyone on the internet with access to a standard Base64 decoder can easily read your text. Never use Base64 to securely hide sensitive data from malicious actors.

Why am I getting an "Invalid characters" error when decoding?

This error occurs because the string you pasted is not formatted as valid Base64. By standard definition, Base64 strings can only contain uppercase letters (A-Z), lowercase letters (a-z), numbers (0-9), plus signs (+), slashes (/), and equal signs (=) used strictly for padding at the end of the string.

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