📦
Base64 Encoder Decoder - Free Online Base64 Tool
Encode text to base64 or decode base64 strings instantly with this free online tool. Supports base 64 encoding, encode b64 format, and bidirectional base64 conversion. Fast, accurate, and runs entirely in your browser for complete privacy.
Charset: 💡 UTF-8: Supports all Unicode characters
How to Use Base64 Encoder/Decoder
Quick Start Guide
1
Select 'Encode' or 'Decode' mode from the tabs
2
For encoding: Enter text or upload an image file
3
For decoding: Paste your Base64 string into the input box
4
Click the action button and copy the result
💡Pro Tips
✓Supports multiple character encodings (UTF-8, GBK, etc.)
✓Can encode images to Base64 for embedding in HTML/CSS
✓All processing happens locally in your browser
✓Useful for embedding small images in web pages
Frequently Asked Questions
Base64 is a binary-to-text encoding scheme that represents binary data in an ASCII string format. It converts every 3 bytes of binary data into 4 ASCII characters, making it safe for transmission over text-based protocols like email or HTTP.
Base64 is commonly used for embedding images in HTML/CSS, sending binary data through JSON APIs, storing complex data in cookies, and ensuring data integrity when transmitting binary content through text-only channels.
No, Base64 is NOT encryption. It's an encoding scheme that can be easily decoded by anyone. It does not provide any security or confidentiality. For secure data transmission, use proper encryption methods like AES or RSA.
Base64 encoding increases data size by approximately 33%. This is because every 3 bytes (24 bits) of original data becomes 4 Base64 characters (also 24 bits, but using only 6 bits per character from a 64-character alphabet).
Yes! All Base64 encoding/decoding happens entirely in your browser. Your data never leaves your device or gets sent to any server, ensuring complete privacy and security.
Still have questions? Check out our other tools or contact us for support.