Dev & Data ToolboxBase64 Encoder / Decoder
Text to Encode
Configuration
Common Examples
Base64 Output
Output will appear here after conversion
About Base64
Base64 is a binary-to-text encoding scheme that represents binary data in an ASCII string format.
Use Cases: Email attachments, data URLs, API responses, file encoding
Characters: A-Z, a-z, 0-9, +, /, = (padding)
Size Increase: ~33% larger than original binary data
Base64 Encoder / Decoder - Binary-to-Text Encoding Tool
Convert text, files, and binary data to Base64 encoding and decode Base64 back to its original format. Our tool supports multiple character encodings including UTF-8, ASCII, Latin-1, and UTF-16 for maximum compatibility.
This free online tool processes all data locally in your browser, ensuring your data privacy while providing fast, reliable Base64 encoding and decoding for any type of content.
How to Use Base64 Encoder / Decoder
Choose Mode
Select "Encode" to convert text to Base64 or "Decode" to convert Base64 back to text.
Enter Data
Type or paste your text, or upload a file to convert. Use the configuration options for charset settings.
Get Result
View the converted output and copy it to your clipboard for use in your applications.
Key Features
Dual Mode Support
Encode text to Base64 or decode Base64 back to original text
Multiple Charsets
Support for UTF-8, ASCII, Latin-1, and UTF-16 character encodings
Live Mode
Real-time conversion as you type with automatic updates
File Upload
Upload text files for encoding or Base64 files for decoding
Privacy First
All processing happens locally in your browser - no data sent to servers
Common Examples
Quick access to common encoding examples and use cases
About Base64 Encoding
What is Base64?
Base64 is a binary-to-text encoding scheme that represents binary data in an ASCII string format. It uses 64 characters (A-Z, a-z, 0-9, +, /) plus padding characters (=) to encode any binary data.
Common Use Cases
Email attachments, data URLs in web applications, API responses, image embedding, and any scenario where binary data needs to be transmitted as text.
Size Overhead
Base64 encoding increases the size of data by approximately 33% due to the conversion from binary to ASCII representation.
Character Set
Uses 64 safe ASCII characters: A-Z (26), a-z (26), 0-9 (10), + and / (2), with = for padding to ensure the length is a multiple of 4.
Frequently Asked Questions
What is Base64 encoding used for?
Base64 is commonly used for encoding binary data in email attachments, embedding images in HTML/CSS, storing binary data in JSON, and transmitting binary data over text-based protocols.
Why does Base64 increase file size?
Base64 converts every 3 bytes of binary data into 4 ASCII characters, resulting in a 33% size increase. This is necessary to represent binary data using only printable ASCII characters.
Can I encode any type of file?
Yes! You can encode any file type. For text files, the tool reads them as text. For binary files, you can upload them and the tool will handle the encoding process.
Is my data secure?
Absolutely! All encoding and decoding happens locally in your browser. No data is sent to our servers, ensuring complete privacy and security of your files and text.
Technical Information
Supported Encodings
UTF-8 (default), ASCII, Latin-1, and UTF-16 character encodings for maximum compatibility
File Support
Text files (.txt, .json, .xml, .html, .css, .js) for encoding, any file type for decoding
Browser Compatibility
Modern browsers with ES6+ support: Chrome, Firefox, Safari, Edge
Privacy & Security
Your data privacy is our top priority. This tool processes all Base64 encoding and decoding locally in your browser using JavaScript. No data is transmitted to our servers or stored anywhere. You maintain complete control over your information throughout the entire conversion process.
Privacy Features:
- • No data transmission to servers
- • Local browser processing only
- • No data storage or logging
- • No tracking or analytics on your data