Base64 encoding transforms binary data into ASCII text format, making it safe for transmission over text-based protocols like HTTP, email, and JSON. Our encoder handles text, URLs, and files with instant encoding and decoding, perfect for embedding images in HTML/CSS or debugging API responses.
🔄 Bidirectional - Encode to Base64 or decode back to original data
📁 Multiple inputs - Handle text, URLs, and file uploads
⚡ Real-time processing - See encoded results instantly
🔒 Privacy-focused - All encoding happens in your browser
📋 Easy copying - One-click copy of encoded output
🎨 Syntax highlighting - Color-coded output for better readability
Embed Images in CSS
Base64 encode small images (under 10KB) to embed directly in CSS as data URIs. This reduces HTTP requests and can improve initial page load performance, especially for icons and small graphics.
Understand Size Increase
Base64 encoding increases data size by approximately 33%. A 100KB file becomes 133KB when encoded. Use compression before encoding large files, and avoid Base64 for files over 100KB.
API Authentication
Many APIs use Base64 for Basic Authentication headers. Encode 'username:password' to create the Authorization header value. Remember this is encoding, not encryption—use HTTPS.
JSON Data Embedding
Base64 encode binary data before including in JSON payloads. JSON doesn't support binary data directly, so Base64 encoding enables safe transmission of files, images, and certificates via JSON APIs.
Debug Data URIs
Decode Base64 data URIs from HTML/CSS to inspect embedded content. This is invaluable when debugging third-party code or reverse-engineering data URI implementations.
URL Encoder / Decoder
Encode or decode special characters in URLs.
JWT Decoder
Decode and inspect JSON Web Tokens.
Data Format Converter
Convert between JSON, YAML, and XML formats with real-time validation.
JSON to Code Converter
Convert JSON objects into TypeScript interfaces, Zod schemas, or Python dataclasses.