Base64 Encoder - Base64 Encoding Online

Encryption and Base64 decoding

Original text

Base64

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💡 Base64 What is the size?

Base64 is a method of encoding binary data into an ASCII string. Often used to:

  • Embed images in HTML/CSS (Data URI)
  • Transmit data via URL or API
  • Store data in JSON

Base64 Encoder/Decoder Online - Professional free Base64 encoding tool

Tan Phat Digital's Base64 Encoder/Decoder tool helps encode and decode Base64 quickly and accurately. Base64 is a popular encoding method in web programming, used to embed images in HTML/CSS (Data URI), transmit data via API, encode email attachments, and store binary data in JSON/XML. The tool fully supports Unicode and Vietnamese thanks to UTF-8 encoding. The swap feature allows quick input/output swapping for encoding and decoding testing. Completely offline processing in the browser, ensuring absolute security for sensitive data. Unlimited text length, completely free.

Outstanding features

Encode text to Base64
Base64 decoding to original text
Fully supports Unicode and Vietnamese
Swap feature quickly swaps input/output
Copy results with one click
Show detailed error when Base64 is invalid
Completely offline processing on the browser
Absolute security - data is not sent to the server
Unlimited text length
Completely free, no registration required

What is Base64 and where is it used?

Base64 is an encoding method that converts binary data into a safe ASCII string, using 64 characters: A-Z, a-z, 0-9, +, /. Base64 is widely used in: Data URIs to embed images/fonts directly into HTML/CSS, reducing HTTP requests. Email attachments (MIME encoding). API authentication with Basic Auth header. JWT tokens (JSON Web Tokens). Store binary data in JSON, XML, or databases that only support text. Pass data via URLs when special characters need to be avoided. Although Base64 increases size by ~33%, it ensures data integrity when transmitted over protocols that only support ASCII.

Benefits when used

  • •Embed images directly into HTML/CSS, reducing HTTP requests
  • •Secure binary data transmission via text-only protocols
  • •Encode data for URLs and API parameters
  • •Debug JWT tokens and API responses
  • •Create Data URIs for small assets
  • •Encode email attachments
  • •Store binary data in JSON/XML
  • •Learn about encoding and data representation

Detailed instructions on how to use Base64 Encoder/Decoder

  1. 1Select the
  2. 2tab to encode or
  3. 3to decode
  4. 4Enter the text to encode or the Base64 string to decode
  5. 5Press the
  6. 6button or
  7. 7to convert
  8. 8See the results in the right panel
  9. 9Click the copy icon to copy the
  10. 10results Click the swap icon to swap input/output and continue

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