Base64 Encoder
Online Base64 encoder and decoder tool for converting text to Base64 format and vice versa. Real-time processing with secure local handling.
Base64 Encoder & Decoder
Professional-grade Base64 encoding and decoding tool built on RFC 4648 international standard. Supports secure bidirectional conversion between text and Base64 format, ideal for data transmission, storage, and API development. 100% local processing protects your data privacy and security.
Base64 Encode
Convert text to Base64 format
📝 Input Text
🔤 Output Base64
Quick Guide
🔐 Encode Mode
Convert plain text to Base64 format, commonly used for data transmission and storage
🔓 Decode Mode
Convert Base64 format strings back to original text content
⚡ Real-time Conversion
Automatic conversion as you type, no need to manually click convert button
📚 Complete Base64 Guide
Deep dive into Base64 encoding principles, usage methods, and best practices
Technical Principles Explained
Base64 is a binary data encoding method based on 64 printable ASCII characters, defined by RFC 4648 standard. Its core principle is to regroup every 3 bytes (24 bits) of binary data into 4 6-bit units, then represent them with corresponding Base64 characters.
Encoding Process:
- Convert input text to UTF-8 byte sequence
- Group every 3 bytes (24 bits)
- Regroup into 4 6-bit units
- Map each 6-bit value to Base64 character table
- Pad with "=" for insufficient bits
Step-by-Step Usage Guide
🔐 Encoding Steps:
- Paste or type text in the left input box
- Ensure current mode is "Encode"
- Base64 encoded result appears automatically on the right
- Click "Copy Result" button to get the encoded string
🔓 Decoding Steps:
- Click "Toggle Mode" to switch to decode mode
- Paste Base64 string in the left input box
- Decoded original text appears automatically on the right
- Verify the correctness of the decoded result
Real-World Applications
📧 Email Systems
MIME standard uses Base64 to encode email attachments, ensuring binary files are correctly transmitted in text protocols
🔑 JWT Tokens
JSON Web Token header and payload sections use Base64URL encoding for authentication purposes
🌐 Data URIs
Embed images and resources directly in HTML/CSS using format: data:image/png;base64,...
⚙️ API Development
HTTP Basic authentication, API key transmission, configuration file storage scenarios
Important Security Reminders
⚠️ Encoding ≠ Encryption
Base64 is a reversible encoding method that anyone can easily decode. Do not use it to protect sensitive information
🔐 True Security
Use proper encryption algorithms like AES, RSA for sensitive data, combined with appropriate key management
💾 Privacy Protection
This tool processes 100% locally with no server uploads, but still avoid processing confidential information
Character Set Support
Perfect support for UTF-8 encoding, including Chinese, Japanese, Korean, Arabic and other multilingual characters, as well as emoji symbols. Ensures correct encoding and decoding of internationalized content.
Performance Optimization
Implements high-performance encoding/decoding using modern browser native APIs, supports large file processing. Real-time conversion with no delay, maintains smooth experience even when processing several MB of text.
Browser Compatibility
Compatible with all modern browsers including Chrome, Firefox, Safari, Edge. No plugins or software installation required, ready to use instantly. Responsive design adapts to all device sizes.