Base64 Codec

Text & File Base64 Encoder / Decoder

Comprehensive Base64 converter supporting both text strings and binary files. Generate Data URIs for images or decode Base64 back into files with zero upload.

About Base64 Codec

Encode and decode ASCII, UTF-8 strings, and binary files into RFC 4648 Base64 format right inside your browser. Base64 encoding is widely used across software engineering to embed images directly into HTML/CSS stylesheets (Data URIs), transmit binary attachments over email, and serialize data for REST APIs.

Key Features & Benefits

  • Encode and decode plaintext and files in both directions.
  • Automatic Data URI header generation for images and fonts.
  • Live syntax-highlighted editor with 1-click clipboard copy.
  • Zero server upload: process private API keys and tokens safely.

How to Use Base64 Codec

  1. Select Direction: Choose "Encode" or "Decode" mode.
  2. Provide Input: Type your text or drop a file into the encoder.
  3. Copy Result: Click Copy to Clipboard to save your Base64 string.

Common Use Cases

  • Embedding Image Data URIs (Front-End Developers): Convert small icons and logos to data:image/png;base64,... strings for inlining in CSS.
  • API Payload Debugging (Full-Stack Developers): Decode Base64 payloads and tokens received from server logs.

Technical Specifications

  • Engine: Native Window btoa/atob & FileReader Buffer APIs
  • Execution Mode: Client-Side Binary String Conversion
  • Privacy Guarantee: 100% Local Device Isolation
  • Input Formats: Plaintext Strings or Binary Files
  • Output Formats: Base64 Encoded Text or Decoded Binary Files

Frequently Asked Questions

What is a Data URI?

A Data URI allows you to inline an entire image or file directly inside HTML or CSS code without making a separate HTTP request.

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