Base64 Encoder & Decoder Online - Free Tool

Encode text, images, and files to Base64 format instantly. Decode Base64 strings back to original format. Perfect for developers, web designers, and data professionals. 100% secure, works entirely in your browser.

Input

0 characters

Output

0 bytes
0%
📊 Quick Stats
0 Encoded Today
100% Secure
0ms Processing Time
⚡ Processing Speed
Instant processing
🔒

100% Secure

All encoding/decoding happens locally in your browser. No data is sent to any server.

⚡

Lightning Fast

Process large files and text instantly with optimized algorithms. No delays, no limits.

🔄

Bidirectional

Encode to Base64 and decode back to original format. Perfect for debugging and development.

🎯

Multi-Format

Handle text, images, PDFs, documents, and any file type. Supports text, file, and URL inputs.

Why Use Our Base64 Encoder?

Web Development

Encode images and assets for inline CSS/HTML data URIs to reduce HTTP requests

Data Transmission

Safely transmit binary data over text-only protocols like email or JSON APIs

Security Testing

Encode/decode data for security analysis, penetration testing, and debugging

Database Storage

Store binary files in text-based databases and configuration files

Common Use Cases:

  • Web Developers: Embed images directly in CSS/HTML
  • API Developers: Send binary data in JSON payloads
  • System Administrators: Encode configuration files
  • Security Analysts: Analyze encoded data in logs
  • Email Systems: Attach files in email bodies
  • Mobile Developers: Store images in app configurations
  • Game Developers: Embed assets in game scripts
  • DevOps Engineers: Encode secrets in deployment scripts

📝 Base64 Quick Guide

What is Base64? Base64 is a binary-to-text encoding scheme that represents binary data in ASCII string format.

Character Set: Uses A-Z, a-z, 0-9, +, /, and = for padding (64 characters total).

Size Increase: Base64 encoded data is approximately 33% larger than original binary data.

Common Uses: Data URIs, email attachments, API data transmission, storing binary in text formats.

❓ Frequently Asked Questions

Is my data safe?

Absolutely! All processing happens locally in your browser. No data is uploaded to any server.

What's the maximum file size?

Limited only by your browser's memory. Typically handles files up to 500MB without issues.

Can I encode images?

Yes! You can encode images (PNG, JPG, GIF, SVG), PDFs, documents, and any file type.

Does it work offline?

Yes! Once loaded, the tool works completely offline. No internet connection required.

How accurate is the decoding?

100% accurate. Uses browser-native functions for perfect encoding/decoding every time.

💻 Code Examples

JavaScript Encoding:

// Encode to Base64
const encoded = btoa("Hello World");
console.log(encoded); // "SGVsbG8gV29ybGQ="

// Decode from Base64
const decoded = atob("SGVsbG8gV29ybGQ=");
console.log(decoded); // "Hello World"

Data URI Example:

<img src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUg...">

CSS Background:

.background {
  background-image: url('data:image/svg+xml;base64,PHN2ZyB3aWR0aD0i...');
}

✅ Browser Compatibility

Chrome Firefox Safari Edge Opera Brave

Works on all modern browsers. No plugins or extensions required.

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