Base64 Encoder / Decoder

How to Encode and Decode Base64 with FreeToolPoint

1. Enter your input — Paste or type either plain text (to encode) or a Base64 string (to decode) into the input field. The tool handles any text content including Unicode characters, special symbols, and multi-line text.
2. Click Encode or Decode — Click Encode to convert plain text into a Base64-encoded string. Click Decode to convert a Base64 string back into readable plain text. The conversion happens instantly in your browser.
3. Review the output — The result appears in the output area below. Encoded output will be a string of letters, numbers, plus signs, and forward slashes. Decoded output will be the original human-readable text.
4. Copy your result — Click Copy to copy the output to your clipboard. Use the encoded string in your HTML data URIs, API payloads, email headers, or wherever Base64-encoded data is required.

Why Use Our Base64 Encoder/Decoder

• Full Unicode support — This tool correctly handles Unicode text including accented characters, Asian scripts, emojis, and any other multi-byte characters. It uses a UTF-8 encoding step before Base64 conversion to ensure compatibility across all systems.
• Instant browser-based processing — Encoding and decoding happen locally using JavaScript's btoa and atob functions. There is no server round-trip, no file upload, and no waiting. Results appear immediately regardless of input size.
• Error detection — If you try to decode an invalid Base64 string, the tool alerts you immediately rather than producing garbled output. This helps catch data corruption or truncation issues in Base64-encoded payloads.
• Complete privacy — Your text data never leaves your browser. This is critical when encoding or decoding sensitive content like authentication tokens, API credentials, or encrypted data payloads.

What is Base64 Encoding?

Base64 is a binary-to-text encoding scheme that represents binary data using a set of 64 ASCII characters (A-Z, a-z, 0-9, +, /). It was originally designed to safely transmit binary data over channels that only support text, such as email (MIME) and early web protocols. The encoding increases data size by approximately 33%, since every 3 bytes of input produce 4 characters of output.

In modern web development, Base64 is commonly used for embedding small images directly in HTML or CSS (data URIs), encoding binary file content for JSON API payloads, transmitting authentication credentials in HTTP headers (Basic Authentication), and encoding email attachments. The data URI format looks like "data:image/png;base64," followed by the encoded content.

While Base64 encoding makes data look scrambled, it is not encryption and provides no security. Anyone can decode a Base64 string back to its original content. If you need to protect sensitive data, use proper encryption before Base64 encoding. Base64 is purely a data representation format, not a security mechanism.