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Base64 Encoder & Decoder

Encode text, images and files to Base64 or decode Base64 strings instantly. Essential tool for developers working with data URIs, email attachments, and API authentication.

What is Base64 Encoding?

Base64 is a binary-to-text encoding scheme that represents binary data in ASCII string format by translating it into a radix-64 representation. This encoding is commonly used in web development for embedding images as data URIs, encoding email attachments, storing binary data in JSON/XML, API authentication tokens, and transmitting binary data over protocols designed for text. Base64 encoding increases data size by approximately 33% but ensures safe transmission across systems that only support text.

How to Use the Base64 Encoder

  1. Choose 'Encode' mode and enter your plain text, or paste your text in the input area
  2. Click 'Encode' button to convert your text to Base64 encoded string instantly
  3. To decode, switch to 'Decode' mode, paste your Base64 string and click 'Decode' to get the original text
  4. Copy the result using the copy button for use in your web applications, APIs, or email systems

Common Base64 Use Cases 2026

  • Data URIs: Embed images directly in HTML/CSS as data:image/png;base64,... to reduce HTTP requests
  • Email Attachments: MIME email protocol uses Base64 to encode binary file attachments for text-based transmission
  • API Authentication: Basic HTTP authentication encodes username:password in Base64 for Authorization header
  • JSON/XML Binary Data: Store binary data like images or files in JSON/XML APIs using Base64 encoding
  • Web Tokens: JWT (JSON Web Tokens) use Base64URL encoding for header and payload sections
  • Database Storage: Store small binary files in text-based database fields using Base64 encoding

Why Use Our Base64 Encoder?

  • Instant encoding/decoding - Convert text to Base64 or decode Base64 strings in milliseconds without server delays
  • Client-side processing - All encoding happens in your browser, your sensitive data never leaves your device
  • Bidirectional conversion - Switch seamlessly between encoding plain text to Base64 and decoding Base64 to text
  • Developer-friendly - Perfect for web developers, API integration, email systems, and data URI implementation
  • Free and unlimited - No registration required, encode and decode as many texts as needed for your projects
  • Error handling - Built-in validation detects invalid Base64 strings and provides clear error messages