Free Online Base64 Encoder & Decoder
Encode text to Base64 or decode Base64 strings back to readable text online. Full UTF-8 and Unicode support including Chinese and emoji. Free, instant conversion.
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What is Base64 Encoding?
Base64 is a binary-to-text encoding scheme that represents binary data in an ASCII string format. It's commonly used to embed images in HTML/CSS, transmit data in URLs, store complex data in JSON, and encode email attachments.
How to Use Base64 Encoder/Decoder
- Paste your text or Base64 string in the input area
- Click 'Encode' to convert text to Base64
- Click 'Decode' to convert Base64 back to text
- Copy the result using the Copy button
Base64 Encoder Features
- Encode plain text to Base64
- Decode Base64 back to original text
- Full UTF-8 support (Chinese, emoji, etc.)
- Instant conversion
- Works entirely in your browser
Base64 FAQ
What is Base64 used for?
Base64 is used to encode binary data for transmission over text-based protocols, embed images in CSS/HTML, encode data in URLs, and store binary data in JSON.
Does Base64 encryption provide security?
No, Base64 is an encoding scheme, not encryption. It can be easily decoded by anyone. For security, use proper encryption methods like AES.
Why does Base64 increase file size?
Base64 encoding increases data size by approximately 33% because it converts 3 bytes of binary data into 4 ASCII characters.